gflt110: add PRINTK_PERSIST, EARLY_PRINTK
* lifted from kernel/bruno
* also a fix for lots of warnings
Change-Id: I276358c57d631d79f40e4bc7288488c59adc78f0
diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index 1a6f70e..feb7b11 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -71,6 +71,14 @@
in the kernel. This is helpful if you are debugging code that
executes before the console is initialized.
+config EARLY_PRINTK
+ bool "Early printk"
+ depends on DEBUG_LL
+ help
+ Say Y here if you want to have an early console using the
+ kernel low-level debugging functions. Add earlyprintk to your
+ kernel parameters to enable this console.
+
config DEBUG_ICEDCC
bool "Kernel low-level debugging via EmbeddedICE DCC channel"
depends on DEBUG_LL
diff --git a/arch/arm/configs/gflt110_defconfig b/arch/arm/configs/gflt110_defconfig
index a907b20..cef0917 100644
--- a/arch/arm/configs/gflt110_defconfig
+++ b/arch/arm/configs/gflt110_defconfig
@@ -1,7 +1,7 @@
#
# Automatically generated make config: don't edit
# Linux kernel version: 2.6.32.11
-# Tue Mar 4 11:19:22 2014
+# Thu May 14 10:38:17 2015
#
CONFIG_ARM=y
CONFIG_SYS_SUPPORTS_APM_EMULATION=y
@@ -81,10 +81,11 @@
CONFIG_UID16=y
CONFIG_SYSCTL_SYSCALL=y
CONFIG_KALLSYMS=y
+# CONFIG_KALLSYMS_ALL is not set
# CONFIG_KALLSYMS_EXTRA_PASS is not set
CONFIG_HOTPLUG=y
CONFIG_PRINTK=y
-# CONFIG_PRINTK_PERSIST is not set
+CONFIG_PRINTK_PERSIST=y
CONFIG_BUG=y
CONFIG_ELF_CORE=y
CONFIG_BASE_FULL=y
@@ -517,6 +518,7 @@
CONFIG_ARCH_SUPPORTS_MSI=y
# CONFIG_PCI_MSI is not set
CONFIG_PCI_LEGACY=y
+# CONFIG_PCI_DEBUG is not set
# CONFIG_PCI_STUB is not set
# CONFIG_PCI_IOV is not set
# CONFIG_PCCARD is not set
@@ -734,6 +736,8 @@
CONFIG_FW_LOADER=y
CONFIG_FIRMWARE_IN_KERNEL=y
CONFIG_EXTRA_FIRMWARE=""
+# CONFIG_DEBUG_DRIVER is not set
+# CONFIG_DEBUG_DEVRES is not set
# CONFIG_SYS_HYPERVISOR is not set
# CONFIG_CONNECTOR is not set
CONFIG_MTD=y
@@ -1131,6 +1135,7 @@
# CONFIG_PPS is not set
CONFIG_ARCH_REQUIRE_GPIOLIB=y
CONFIG_GPIOLIB=y
+# CONFIG_DEBUG_GPIO is not set
# CONFIG_GPIO_SYSFS is not set
#
@@ -1600,20 +1605,61 @@
# CONFIG_UNUSED_SYMBOLS is not set
# CONFIG_DEBUG_FS is not set
# CONFIG_HEADERS_CHECK is not set
-# CONFIG_DEBUG_KERNEL is not set
+CONFIG_DEBUG_KERNEL=y
+# CONFIG_DEBUG_SHIRQ is not set
+CONFIG_DETECT_SOFTLOCKUP=y
+# CONFIG_BOOTPARAM_SOFTLOCKUP_PANIC is not set
+CONFIG_BOOTPARAM_SOFTLOCKUP_PANIC_VALUE=0
+CONFIG_DETECT_HUNG_TASK=y
+# CONFIG_BOOTPARAM_HUNG_TASK_PANIC is not set
+CONFIG_BOOTPARAM_HUNG_TASK_PANIC_VALUE=0
+CONFIG_SCHED_DEBUG=y
+# CONFIG_SCHEDSTATS is not set
+# CONFIG_TIMER_STATS is not set
+# CONFIG_DEBUG_OBJECTS is not set
+# CONFIG_DEBUG_SLAB is not set
+# CONFIG_DEBUG_KMEMLEAK is not set
+# CONFIG_DEBUG_RT_MUTEXES is not set
+# CONFIG_RT_MUTEX_TESTER is not set
+# CONFIG_DEBUG_SPINLOCK is not set
+# CONFIG_DEBUG_MUTEXES is not set
+# CONFIG_DEBUG_LOCK_ALLOC is not set
+# CONFIG_PROVE_LOCKING is not set
+# CONFIG_LOCK_STAT is not set
+# CONFIG_DEBUG_SPINLOCK_SLEEP is not set
+# CONFIG_DEBUG_LOCKING_API_SELFTESTS is not set
+# CONFIG_DEBUG_KOBJECT is not set
CONFIG_DEBUG_BUGVERBOSE=y
+# CONFIG_DEBUG_INFO is not set
+# CONFIG_DEBUG_VM is not set
+# CONFIG_DEBUG_WRITECOUNT is not set
CONFIG_DEBUG_MEMORY_INIT=y
+# CONFIG_DEBUG_LIST is not set
+# CONFIG_DEBUG_SG is not set
+# CONFIG_DEBUG_NOTIFIERS is not set
+# CONFIG_DEBUG_CREDENTIALS is not set
CONFIG_FRAME_POINTER=y
+# CONFIG_BOOT_PRINTK_DELAY is not set
+# CONFIG_RCU_TORTURE_TEST is not set
# CONFIG_RCU_CPU_STALL_DETECTOR is not set
+# CONFIG_BACKTRACE_SELF_TEST is not set
+# CONFIG_DEBUG_BLOCK_EXT_DEVT is not set
+# CONFIG_DEBUG_FORCE_WEAK_PER_CPU is not set
+# CONFIG_FAULT_INJECTION is not set
# CONFIG_LATENCYTOP is not set
# CONFIG_SYSCTL_SYSCALL_CHECK is not set
+# CONFIG_PAGE_POISONING is not set
CONFIG_HAVE_FUNCTION_TRACER=y
CONFIG_TRACING_SUPPORT=y
# CONFIG_FTRACE is not set
# CONFIG_SAMPLES is not set
CONFIG_HAVE_ARCH_KGDB=y
+# CONFIG_KGDB is not set
# CONFIG_ARM_UNWIND is not set
CONFIG_DEBUG_USER=y
+# CONFIG_DEBUG_ERRORS is not set
+# CONFIG_DEBUG_STACK_USAGE is not set
+# CONFIG_DEBUG_LL is not set
#
# Security options
diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
index 79087dd..d0e40b7 100644
--- a/arch/arm/kernel/Makefile
+++ b/arch/arm/kernel/Makefile
@@ -52,5 +52,6 @@
head-y := head$(MMUEXT).o
obj-$(CONFIG_DEBUG_LL) += debug.o
+obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
extra-y := $(head-y) init_task.o vmlinux.lds
diff --git a/arch/arm/kernel/early_printk.c b/arch/arm/kernel/early_printk.c
new file mode 100644
index 0000000..85aa2b2
--- /dev/null
+++ b/arch/arm/kernel/early_printk.c
@@ -0,0 +1,57 @@
+/*
+ * linux/arch/arm/kernel/early_printk.c
+ *
+ * Copyright (C) 2009 Sascha Hauer <s.hauer@pengutronix.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/console.h>
+#include <linux/init.h>
+
+extern void printch(int);
+
+static void early_write(const char *s, unsigned n)
+{
+ while (n-- > 0) {
+ if (*s == '\n')
+ printch('\r');
+ printch(*s);
+ s++;
+ }
+}
+
+static void early_console_write(struct console *con, const char *s, unsigned n)
+{
+ early_write(s, n);
+}
+
+static struct console early_console = {
+ .name = "earlycon",
+ .write = early_console_write,
+ .flags = CON_PRINTBUFFER | CON_BOOT,
+ .index = -1,
+};
+
+asmlinkage void early_printk(const char *fmt, ...)
+{
+ char buf[512];
+ int n;
+ va_list ap;
+
+ va_start(ap, fmt);
+ n = vscnprintf(buf, sizeof(buf), fmt, ap);
+ early_write(buf, n);
+ va_end(ap);
+}
+
+static int __init setup_early_printk(char *buf)
+{
+ register_console(&early_console);
+ return 0;
+}
+
+early_param("earlyprintk", setup_early_printk);
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index f95401e..cd0ba57 100755
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -801,12 +801,14 @@
#endif
parse_cmdline(cmdline_p, boot_command_line);
paging_init(mdesc);
+#if 0
#ifdef CONFIG_DEBUG_LL
{
extern int ll_debug;
ll_debug=1;
}
#endif
+#endif
request_standard_resources(&meminfo, mdesc);
#ifdef CONFIG_SMP
diff --git a/fs/proc/kmsg.c b/fs/proc/kmsg.c
index 7ca7834..a8c6d0f 100644
--- a/fs/proc/kmsg.c
+++ b/fs/proc/kmsg.c
@@ -12,37 +12,37 @@
#include <linux/poll.h>
#include <linux/proc_fs.h>
#include <linux/fs.h>
+#include <linux/syslog.h>
#include <asm/uaccess.h>
#include <asm/io.h>
extern wait_queue_head_t log_wait;
-extern int do_syslog(int type, char __user *bug, int count);
-
static int kmsg_open(struct inode * inode, struct file * file)
{
- return do_syslog(1,NULL,0);
+ return do_syslog(SYSLOG_ACTION_OPEN, NULL, 0, SYSLOG_FROM_FILE);
}
static int kmsg_release(struct inode * inode, struct file * file)
{
- (void) do_syslog(0,NULL,0);
+ (void) do_syslog(SYSLOG_ACTION_CLOSE, NULL, 0, SYSLOG_FROM_FILE);
return 0;
}
static ssize_t kmsg_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
- if ((file->f_flags & O_NONBLOCK) && !do_syslog(9, NULL, 0))
+ if ((file->f_flags & O_NONBLOCK) &&
+ !do_syslog(SYSLOG_ACTION_SIZE_UNREAD, NULL, 0,SYSLOG_FROM_FILE))
return -EAGAIN;
- return do_syslog(2, buf, count);
+ return do_syslog(SYSLOG_ACTION_READ, buf, count, SYSLOG_FROM_FILE);
}
static unsigned int kmsg_poll(struct file *file, poll_table *wait)
{
poll_wait(file, &log_wait, wait);
- if (do_syslog(9, NULL, 0))
+ if (do_syslog(SYSLOG_ACTION_SIZE_UNREAD, NULL, 0, SYSLOG_FROM_FILE))
return POLLIN | POLLRDNORM;
return 0;
}
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index f4e3184..9f61498 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -15,6 +15,7 @@
#include <linux/bitops.h>
#include <linux/log2.h>
#include <linux/typecheck.h>
+#include <linux/printk.h>
#include <linux/ratelimit.h>
#include <linux/dynamic_debug.h>
#include <asm/byteorder.h>
@@ -88,31 +89,6 @@
*/
#define lower_32_bits(n) ((u32)(n))
-#define KERN_EMERG "<0>" /* system is unusable */
-#define KERN_ALERT "<1>" /* action must be taken immediately */
-#define KERN_CRIT "<2>" /* critical conditions */
-#define KERN_ERR "<3>" /* error conditions */
-#define KERN_WARNING "<4>" /* warning conditions */
-#define KERN_NOTICE "<5>" /* normal but significant condition */
-#define KERN_INFO "<6>" /* informational */
-#define KERN_DEBUG "<7>" /* debug-level messages */
-
-/* Use the default kernel loglevel */
-#define KERN_DEFAULT "<d>"
-/*
- * Annotation for a "continued" line of log printout (only done after a
- * line that had no enclosing \n). Only to be used by core/arch code
- * during early bootup (a continued line is not SMP-safe otherwise).
- */
-#define KERN_CONT "<c>"
-
-extern int console_printk[];
-
-#define console_loglevel (console_printk[0])
-#define default_message_loglevel (console_printk[1])
-#define minimum_console_loglevel (console_printk[2])
-#define default_console_loglevel (console_printk[3])
-
struct completion;
struct pt_regs;
struct user;
@@ -211,95 +187,8 @@
struct pid;
extern struct pid *session_of_pgrp(struct pid *pgrp);
-/*
- * FW_BUG
- * Add this to a message where you are sure the firmware is buggy or behaves
- * really stupid or out of spec. Be aware that the responsible BIOS developer
- * should be able to fix this issue or at least get a concrete idea of the
- * problem by reading your message without the need of looking at the kernel
- * code.
- *
- * Use it for definite and high priority BIOS bugs.
- *
- * FW_WARN
- * Use it for not that clear (e.g. could the kernel messed up things already?)
- * and medium priority BIOS bugs.
- *
- * FW_INFO
- * Use this one if you want to tell the user or vendor about something
- * suspicious, but generally harmless related to the firmware.
- *
- * Use it for information or very low priority BIOS bugs.
- */
-#define FW_BUG "[Firmware Bug]: "
-#define FW_WARN "[Firmware Warn]: "
-#define FW_INFO "[Firmware Info]: "
-
-#ifdef CONFIG_PRINTK
-asmlinkage int vprintk(const char *fmt, va_list args)
- __attribute__ ((format (printf, 1, 0)));
-asmlinkage int printk(const char * fmt, ...)
- __attribute__ ((format (printf, 1, 2))) __cold;
-
-extern struct ratelimit_state printk_ratelimit_state;
-extern int printk_ratelimit(void);
-extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
- unsigned int interval_msec);
-
-extern int printk_delay_msec;
-
-/*
- * Print a one-time message (analogous to WARN_ONCE() et al):
- */
-#define printk_once(x...) ({ \
- static bool __print_once = true; \
- \
- if (__print_once) { \
- __print_once = false; \
- printk(x); \
- } \
-})
-
-void log_buf_kexec_setup(void);
-#else
-static inline int vprintk(const char *s, va_list args)
- __attribute__ ((format (printf, 1, 0)));
-static inline int vprintk(const char *s, va_list args) { return 0; }
-static inline int printk(const char *s, ...)
- __attribute__ ((format (printf, 1, 2)));
-static inline int __cold printk(const char *s, ...) { return 0; }
-static inline int printk_ratelimit(void) { return 0; }
-static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies, \
- unsigned int interval_msec) \
- { return false; }
-
-/* No effect, but we still get type checking even in the !PRINTK case: */
-#define printk_once(x...) printk(x)
-
-static inline void log_buf_kexec_setup(void)
-{
-}
-#endif
-
-extern int printk_needs_cpu(int cpu);
-extern void printk_tick(void);
-
-extern void asmlinkage __attribute__((format(printf, 1, 2)))
- early_printk(const char *fmt, ...);
-
unsigned long int_sqrt(unsigned long);
-static inline void console_silent(void)
-{
- console_loglevel = 0;
-}
-
-static inline void console_verbose(void)
-{
- if (console_loglevel)
- console_loglevel = 15;
-}
-
extern void bust_spinlocks(int yes);
extern void wake_up_klogd(void);
extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */
@@ -335,22 +224,6 @@
#define TAINT_WARN 9
#define TAINT_CRAP 10
-extern void dump_stack(void) __cold;
-
-enum {
- DUMP_PREFIX_NONE,
- DUMP_PREFIX_ADDRESS,
- DUMP_PREFIX_OFFSET
-};
-extern void hex_dump_to_buffer(const void *buf, size_t len,
- int rowsize, int groupsize,
- char *linebuf, size_t linebuflen, bool ascii);
-extern void print_hex_dump(const char *level, const char *prefix_str,
- int prefix_type, int rowsize, int groupsize,
- const void *buf, size_t len, bool ascii);
-extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
- const void *buf, size_t len);
-
extern const char hex_asc[];
#define hex_asc_lo(x) hex_asc[((x) & 0x0f)]
#define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4]
@@ -362,50 +235,6 @@
return buf;
}
-#ifndef pr_fmt
-#define pr_fmt(fmt) fmt
-#endif
-
-#define pr_emerg(fmt, ...) \
- printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
-#define pr_alert(fmt, ...) \
- printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
-#define pr_crit(fmt, ...) \
- printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
-#define pr_err(fmt, ...) \
- printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
-#define pr_warning(fmt, ...) \
- printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
-#define pr_notice(fmt, ...) \
- printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
-#define pr_info(fmt, ...) \
- printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
-#define pr_cont(fmt, ...) \
- printk(KERN_CONT fmt, ##__VA_ARGS__)
-
-/* pr_devel() should produce zero code unless DEBUG is defined */
-#ifdef DEBUG
-#define pr_devel(fmt, ...) \
- printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
-#else
-#define pr_devel(fmt, ...) \
- ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; })
-#endif
-
-/* If you are writing a driver, please use dev_dbg instead */
-#if defined(DEBUG)
-#define pr_debug(fmt, ...) \
- printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
-#elif defined(CONFIG_DYNAMIC_DEBUG)
-/* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */
-#define pr_debug(fmt, ...) do { \
- dynamic_pr_debug(fmt, ##__VA_ARGS__); \
- } while (0)
-#else
-#define pr_debug(fmt, ...) \
- ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; })
-#endif
-
/*
* General tracing related utility functions - trace_printk(),
* tracing_on/tracing_off and tracing_start()/tracing_stop
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 3c62ed4..4817b3a 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -425,6 +425,7 @@
if (((unsigned long)uaddr & PAGE_MASK) !=
((unsigned long)end & PAGE_MASK))
ret = __get_user(c, end);
+ (void)c;
}
return ret;
}
diff --git a/include/linux/printk.h b/include/linux/printk.h
new file mode 100644
index 0000000..b772ca5
--- /dev/null
+++ b/include/linux/printk.h
@@ -0,0 +1,248 @@
+#ifndef __KERNEL_PRINTK__
+#define __KERNEL_PRINTK__
+
+extern const char linux_banner[];
+extern const char linux_proc_banner[];
+
+#define KERN_EMERG "<0>" /* system is unusable */
+#define KERN_ALERT "<1>" /* action must be taken immediately */
+#define KERN_CRIT "<2>" /* critical conditions */
+#define KERN_ERR "<3>" /* error conditions */
+#define KERN_WARNING "<4>" /* warning conditions */
+#define KERN_NOTICE "<5>" /* normal but significant condition */
+#define KERN_INFO "<6>" /* informational */
+#define KERN_DEBUG "<7>" /* debug-level messages */
+
+/* Use the default kernel loglevel */
+#define KERN_DEFAULT "<d>"
+/*
+ * Annotation for a "continued" line of log printout (only done after a
+ * line that had no enclosing \n). Only to be used by core/arch code
+ * during early bootup (a continued line is not SMP-safe otherwise).
+ */
+#define KERN_CONT "<c>"
+
+extern int console_printk[];
+
+#define console_loglevel (console_printk[0])
+#define default_message_loglevel (console_printk[1])
+#define minimum_console_loglevel (console_printk[2])
+#define default_console_loglevel (console_printk[3])
+
+struct va_format {
+ const char *fmt;
+ va_list *va;
+};
+
+/*
+ * FW_BUG
+ * Add this to a message where you are sure the firmware is buggy or behaves
+ * really stupid or out of spec. Be aware that the responsible BIOS developer
+ * should be able to fix this issue or at least get a concrete idea of the
+ * problem by reading your message without the need of looking at the kernel
+ * code.
+ *
+ * Use it for definite and high priority BIOS bugs.
+ *
+ * FW_WARN
+ * Use it for not that clear (e.g. could the kernel messed up things already?)
+ * and medium priority BIOS bugs.
+ *
+ * FW_INFO
+ * Use this one if you want to tell the user or vendor about something
+ * suspicious, but generally harmless related to the firmware.
+ *
+ * Use it for information or very low priority BIOS bugs.
+ */
+#define FW_BUG "[Firmware Bug]: "
+#define FW_WARN "[Firmware Warn]: "
+#define FW_INFO "[Firmware Info]: "
+
+/*
+ * HW_ERR
+ * Add this to a message for hardware errors, so that user can report
+ * it to hardware vendor instead of LKML or software vendor.
+ */
+#define HW_ERR "[Hardware Error]: "
+
+#ifdef CONFIG_PRINTK
+asmlinkage int vprintk(const char *fmt, va_list args)
+ __attribute__ ((format (printf, 1, 0)));
+asmlinkage int printk(const char * fmt, ...)
+ __attribute__ ((format (printf, 1, 2))) __cold;
+
+/*
+ * Please don't use printk_ratelimit(), because it shares ratelimiting state
+ * with all other unrelated printk_ratelimit() callsites. Instead use
+ * printk_ratelimited() or plain old __ratelimit().
+ */
+extern int __printk_ratelimit(const char *func);
+#define printk_ratelimit() __printk_ratelimit(__func__)
+extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
+ unsigned int interval_msec);
+
+extern int printk_delay_msec;
+extern int dmesg_restrict;
+
+/*
+ * Print a one-time message (analogous to WARN_ONCE() et al):
+ */
+#define printk_once(x...) ({ \
+ static bool __print_once; \
+ \
+ if (!__print_once) { \
+ __print_once = true; \
+ printk(x); \
+ } \
+})
+
+void log_buf_kexec_setup(void);
+#else
+static inline int vprintk(const char *s, va_list args)
+ __attribute__ ((format (printf, 1, 0)));
+static inline int vprintk(const char *s, va_list args) { return 0; }
+static inline int printk(const char *s, ...)
+ __attribute__ ((format (printf, 1, 2)));
+static inline int __cold printk(const char *s, ...) { return 0; }
+static inline int printk_ratelimit(void) { return 0; }
+static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies, \
+ unsigned int interval_msec) \
+ { return false; }
+
+/* No effect, but we still get type checking even in the !PRINTK case: */
+#define printk_once(x...) printk(x)
+
+static inline void log_buf_kexec_setup(void)
+{
+}
+#endif
+
+/*
+ * Dummy printk for disabled debugging statements to use whilst maintaining
+ * gcc's format and side-effect checking.
+ */
+static inline __attribute__ ((format (printf, 1, 2)))
+int no_printk(const char *s, ...) { return 0; }
+
+extern int printk_needs_cpu(int cpu);
+extern void printk_tick(void);
+
+extern void asmlinkage __attribute__((format(printf, 1, 2)))
+ early_printk(const char *fmt, ...);
+
+static inline void console_silent(void)
+{
+ console_loglevel = 0;
+}
+
+static inline void console_verbose(void)
+{
+ if (console_loglevel)
+ console_loglevel = 15;
+}
+
+extern void dump_stack(void) __cold;
+
+enum {
+ DUMP_PREFIX_NONE,
+ DUMP_PREFIX_ADDRESS,
+ DUMP_PREFIX_OFFSET
+};
+extern void hex_dump_to_buffer(const void *buf, size_t len,
+ int rowsize, int groupsize,
+ char *linebuf, size_t linebuflen, bool ascii);
+extern void print_hex_dump(const char *level, const char *prefix_str,
+ int prefix_type, int rowsize, int groupsize,
+ const void *buf, size_t len, bool ascii);
+extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
+ const void *buf, size_t len);
+
+#ifndef pr_fmt
+#define pr_fmt(fmt) fmt
+#endif
+
+#define pr_emerg(fmt, ...) \
+ printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
+#define pr_alert(fmt, ...) \
+ printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
+#define pr_crit(fmt, ...) \
+ printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
+#define pr_err(fmt, ...) \
+ printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
+#define pr_warning(fmt, ...) \
+ printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
+#define pr_warn pr_warning
+#define pr_notice(fmt, ...) \
+ printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
+#define pr_info(fmt, ...) \
+ printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
+#define pr_cont(fmt, ...) \
+ printk(KERN_CONT fmt, ##__VA_ARGS__)
+
+/* pr_devel() should produce zero code unless DEBUG is defined */
+#ifdef DEBUG
+#define pr_devel(fmt, ...) \
+ printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
+#else
+#define pr_devel(fmt, ...) \
+ ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; })
+#endif
+
+/* If you are writing a driver, please use dev_dbg instead */
+#if defined(DEBUG)
+#define pr_debug(fmt, ...) \
+ printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
+#elif defined(CONFIG_DYNAMIC_DEBUG)
+/* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */
+#define pr_debug(fmt, ...) \
+ dynamic_pr_debug(fmt, ##__VA_ARGS__)
+#else
+#define pr_debug(fmt, ...) \
+ ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; })
+#endif
+
+/*
+ * ratelimited messages with local ratelimit_state,
+ * no local ratelimit_state used in the !PRINTK case
+ */
+#ifdef CONFIG_PRINTK
+#define printk_ratelimited(fmt, ...) ({ \
+ static DEFINE_RATELIMIT_STATE(_rs, \
+ DEFAULT_RATELIMIT_INTERVAL, \
+ DEFAULT_RATELIMIT_BURST); \
+ \
+ if (__ratelimit(&_rs)) \
+ printk(fmt, ##__VA_ARGS__); \
+})
+#else
+/* No effect, but we still get type checking even in the !PRINTK case: */
+#define printk_ratelimited printk
+#endif
+
+#define pr_emerg_ratelimited(fmt, ...) \
+ printk_ratelimited(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
+#define pr_alert_ratelimited(fmt, ...) \
+ printk_ratelimited(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
+#define pr_crit_ratelimited(fmt, ...) \
+ printk_ratelimited(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
+#define pr_err_ratelimited(fmt, ...) \
+ printk_ratelimited(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
+#define pr_warning_ratelimited(fmt, ...) \
+ printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
+#define pr_warn_ratelimited pr_warning_ratelimited
+#define pr_notice_ratelimited(fmt, ...) \
+ printk_ratelimited(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
+#define pr_info_ratelimited(fmt, ...) \
+ printk_ratelimited(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
+/* no pr_cont_ratelimited, don't do that... */
+/* If you are writing a driver, please use dev_dbg instead */
+#if defined(DEBUG)
+#define pr_debug_ratelimited(fmt, ...) \
+ printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
+#else
+#define pr_debug_ratelimited(fmt, ...) \
+ ({ if (0) printk_ratelimited(KERN_DEBUG pr_fmt(fmt), \
+ ##__VA_ARGS__); 0; })
+#endif
+
+#endif
diff --git a/include/linux/ratelimit.h b/include/linux/ratelimit.h
index 00044b8..4330fcf 100644
--- a/include/linux/ratelimit.h
+++ b/include/linux/ratelimit.h
@@ -16,5 +16,9 @@
#define DEFINE_RATELIMIT_STATE(name, interval, burst) \
struct ratelimit_state name = {interval, burst,}
-extern int __ratelimit(struct ratelimit_state *rs);
+extern struct ratelimit_state printk_ratelimit_state;
+
+extern int ___ratelimit(struct ratelimit_state *rs, const char *func);
+#define __ratelimit(state) ___ratelimit(state, __func__)
+
#endif
diff --git a/include/linux/syslog.h b/include/linux/syslog.h
new file mode 100644
index 0000000..3891139
--- /dev/null
+++ b/include/linux/syslog.h
@@ -0,0 +1,52 @@
+/* Syslog internals
+ *
+ * Copyright 2010 Canonical, Ltd.
+ * Author: Kees Cook <kees.cook@canonical.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING. If not, write to
+ * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef _LINUX_SYSLOG_H
+#define _LINUX_SYSLOG_H
+
+/* Close the log. Currently a NOP. */
+#define SYSLOG_ACTION_CLOSE 0
+/* Open the log. Currently a NOP. */
+#define SYSLOG_ACTION_OPEN 1
+/* Read from the log. */
+#define SYSLOG_ACTION_READ 2
+/* Read all messages remaining in the ring buffer. */
+#define SYSLOG_ACTION_READ_ALL 3
+/* Read and clear all messages remaining in the ring buffer */
+#define SYSLOG_ACTION_READ_CLEAR 4
+/* Clear ring buffer. */
+#define SYSLOG_ACTION_CLEAR 5
+/* Disable printk's to console */
+#define SYSLOG_ACTION_CONSOLE_OFF 6
+/* Enable printk's to console */
+#define SYSLOG_ACTION_CONSOLE_ON 7
+/* Set level of messages printed to console */
+#define SYSLOG_ACTION_CONSOLE_LEVEL 8
+/* Return number of unread characters in the log buffer */
+#define SYSLOG_ACTION_SIZE_UNREAD 9
+/* Return size of the log buffer */
+#define SYSLOG_ACTION_SIZE_BUFFER 10
+
+#define SYSLOG_FROM_CALL 0
+#define SYSLOG_FROM_FILE 1
+
+int do_syslog(int type, char __user *buf, int count, bool from_file);
+
+#endif /* _LINUX_SYSLOG_H */
diff --git a/kernel/cred.c b/kernel/cred.c
index 1ed8ca1..3327e0e 100644
--- a/kernel/cred.c
+++ b/kernel/cred.c
@@ -22,10 +22,6 @@
#define kdebug(FMT, ...) \
printk("[%-5.5s%5u] "FMT"\n", current->comm, current->pid ,##__VA_ARGS__)
#else
-static inline __attribute__((format(printf, 1, 2)))
-void no_printk(const char *fmt, ...)
-{
-}
#define kdebug(FMT, ...) \
no_printk("[%-5.5s%5u] "FMT"\n", current->comm, current->pid ,##__VA_ARGS__)
#endif
diff --git a/kernel/printk.c b/kernel/printk.c
index ad1a79b..78a9306 100755
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -33,12 +33,12 @@
#include <linux/bootmem.h>
#include <linux/syscalls.h>
#include <linux/kexec.h>
+#include <linux/ratelimit.h>
+#include <linux/cpu.h>
+#include <linux/notifier.h>
+#include <linux/syslog.h>
#include <asm/uaccess.h>
-#ifdef CONFIG_DEBUG_LL
-/*ll_debug*/
-#include <mach/uncompress.h>
-#endif
/*
* for_each_console() allows you to iterate on each console
@@ -198,6 +198,63 @@
#define PERSIST_SEARCH_JUMP (16*1024*1024)
#define PERSIST_MAGIC 0xbabb1e
+#ifdef CONFIG_BOOTLOG_COPY
+#define BOOTLOG_MAGIC (0x1090091e)
+struct bloghdr {
+ unsigned int magic; /* for kernel verification */
+ unsigned int offset; /* current log offset */
+};
+
+extern unsigned long bootlog_get_addr(void);
+extern unsigned long bootlog_get_size(void);
+
+static inline struct bloghdr *get_bootlog_hdr(void)
+{
+ unsigned long bootlog_size = bootlog_get_size();
+ if (bootlog_size) {
+ struct bloghdr *blog_hdr = (struct bloghdr *)
+ phys_to_virt(bootlog_get_addr());
+ if (BOOTLOG_MAGIC != blog_hdr->magic ||
+ (blog_hdr->offset + sizeof(struct bloghdr) >
+ bootlog_size)) {
+ printk(KERN_INFO "bootlog: header invalid m:0x%08x "
+ "o:0x%08x s:0x%08x\n", blog_hdr->magic,
+ blog_hdr->offset, bootlog_size);
+ return NULL;
+ }
+ return blog_hdr;
+ }
+ return NULL;
+}
+
+static inline unsigned copy_bootlog(struct bloghdr *blog_hdr,
+ unsigned dest_offset)
+{
+ if (blog_hdr) {
+ unsigned idx = dest_offset;
+ char *blog_buf = (char *)(blog_hdr + 1);
+ unsigned i;
+
+ for (i = 0; i < blog_hdr->offset; ++i) {
+ LOG_BUF(idx) = blog_buf[i];
+ ++idx;
+ }
+ if (logged_chars + blog_hdr->offset <= log_buf_len)
+ logged_chars += blog_hdr->offset;
+ else
+ logged_chars = log_buf_len;
+ dest_offset = idx;
+ }
+ return dest_offset;
+}
+
+static inline void free_bootlog(void)
+{
+ free_bootmem(bootlog_get_addr(), bootlog_get_size());
+}
+
+#endif
+
/*
* size is a power of 2 so that the printk offset mask will work. We'll add
* a bit more space to the end of the buffer for our extra data, but that
@@ -259,6 +316,9 @@
{
unsigned size = memparse(str, &str);
unsigned long flags;
+#ifdef CONFIG_BOOTLOG_COPY
+ struct bloghdr *blog_hdr = NULL;
+#endif
if (size)
size = roundup_pow_of_two(size);
@@ -272,10 +332,19 @@
goto out;
}
+#ifdef CONFIG_BOOTLOG_COPY
+ /* Read out the blog_hdr before logbuf is locked in case print
+ * is needed. */
+ blog_hdr = get_bootlog_hdr();
+#endif
+
spin_lock_irqsave(&logbuf_lock, flags);
log_buf_len = size;
log_buf = new_log_buf;
+#ifdef CONFIG_BOOTLOG_COPY
+ dest_offset = copy_bootlog(blog_hdr, dest_offset);
+#endif
offset = start = min(con_start, log_start);
dest_idx = dest_offset;
while (start != log_end) {
@@ -289,6 +358,10 @@
log_end += dest_offset - offset;
spin_unlock_irqrestore(&logbuf_lock, flags);
+#ifdef CONFIG_BOOTLOG_COPY
+ free_bootlog();
+#endif
+
printk(KERN_NOTICE "log_buf_len: %d\n", log_buf_len);
}
out:
@@ -299,7 +372,7 @@
#ifdef CONFIG_BOOT_PRINTK_DELAY
-static unsigned int boot_delay; /* msecs delay after each printk during bootup */
+static int boot_delay; /* msecs delay after each printk during bootup */
static unsigned long long loops_per_msec; /* based on boot_delay */
static int __init boot_delay_setup(char *str)
@@ -350,23 +423,15 @@
}
#endif
+#ifdef CONFIG_SECURITY_DMESG_RESTRICT
+int dmesg_restrict = 1;
+#else
+int dmesg_restrict;
+#endif
+
#define COPY_SIZE 4096
-/*
- * Commands to do_syslog:
- *
- * 0 -- Close the log. Currently a NOP.
- * 1 -- Open the log. Currently a NOP.
- * 2 -- Read from the log.
- * 3 -- Read all messages remaining in the ring buffer.
- * 4 -- Read and clear all messages remaining in the ring buffer
- * 5 -- Clear ring buffer.
- * 6 -- Disable printk's to console
- * 7 -- Enable printk's to console
- * 8 -- Set level of messages printed to console
- * 9 -- Return number of unread characters in the log buffer
- * 10 -- Return size of the log buffer
- */
-int do_syslog(int type, char __user *buf, int len)
+
+int do_syslog(int type, char __user *buf, int len, bool from_file)
{
char *copybuf;
unsigned i, j, limit, count;
@@ -374,16 +439,29 @@
char c;
int error = 0;
+ /*
+ * If this is from /proc/kmsg we only do the capabilities checks
+ * at open time.
+ */
+ if (type == SYSLOG_ACTION_OPEN || !from_file) {
+ if (dmesg_restrict && !capable(CAP_SYS_ADMIN))
+ return -EPERM;
+ if ((type != SYSLOG_ACTION_READ_ALL &&
+ type != SYSLOG_ACTION_SIZE_BUFFER) &&
+ !capable(CAP_SYS_ADMIN))
+ return -EPERM;
+ }
+
error = security_syslog(type);
if (error)
return error;
switch (type) {
- case 0: /* Close log */
+ case SYSLOG_ACTION_CLOSE: /* Close log */
break;
- case 1: /* Open log */
+ case SYSLOG_ACTION_OPEN: /* Open log */
break;
- case 2: /* Read from log */
+ case SYSLOG_ACTION_READ: /* Read from log */
error = -EINVAL;
if (!buf || len < 0)
goto out;
@@ -414,10 +492,12 @@
if (!error)
error = i;
break;
- case 4: /* Read/clear last kernel messages */
+ /* Read/clear last kernel messages */
+ case SYSLOG_ACTION_READ_CLEAR:
do_clear = 1;
/* FALL THRU */
- case 3: /* Read last kernel messages */
+ /* Read last kernel messages */
+ case SYSLOG_ACTION_READ_ALL:
error = -EINVAL;
if (!buf || len < 0)
goto out;
@@ -489,21 +569,25 @@
copy_done:
kfree(copybuf);
break;
- case 5: /* Clear ring buffer */
+ /* Clear ring buffer */
+ case SYSLOG_ACTION_CLEAR:
logged_chars = 0;
break;
- case 6: /* Disable logging to console */
+ /* Disable logging to console */
+ case SYSLOG_ACTION_CONSOLE_OFF:
if (saved_console_loglevel == -1)
saved_console_loglevel = console_loglevel;
console_loglevel = minimum_console_loglevel;
break;
- case 7: /* Enable logging to console */
+ /* Enable logging to console */
+ case SYSLOG_ACTION_CONSOLE_ON:
if (saved_console_loglevel != -1) {
console_loglevel = saved_console_loglevel;
saved_console_loglevel = -1;
}
break;
- case 8: /* Set level of messages printed to console */
+ /* Set level of messages printed to console */
+ case SYSLOG_ACTION_CONSOLE_LEVEL:
error = -EINVAL;
if (len < 1 || len > 8)
goto out;
@@ -514,10 +598,12 @@
saved_console_loglevel = -1;
error = 0;
break;
- case 9: /* Number of chars in the log buffer */
+ /* Number of chars in the log buffer */
+ case SYSLOG_ACTION_SIZE_UNREAD:
error = log_end - log_start;
break;
- case 10: /* Size of the log buffer */
+ /* Size of the log buffer */
+ case SYSLOG_ACTION_SIZE_BUFFER:
error = log_buf_len;
break;
default:
@@ -530,9 +616,25 @@
SYSCALL_DEFINE3(syslog, int, type, char __user *, buf, int, len)
{
- return do_syslog(type, buf, len);
+ return do_syslog(type, buf, len, SYSLOG_FROM_CALL);
}
+#ifdef CONFIG_KGDB_KDB
+/* kdb dmesg command needs access to the syslog buffer. do_syslog()
+ * uses locks so it cannot be used during debugging. Just tell kdb
+ * where the start and end of the physical and logical logs are. This
+ * is equivalent to do_syslog(3).
+ */
+void kdb_syslog_data(char *syslog_data[4])
+{
+ syslog_data[0] = log_buf;
+ syslog_data[1] = log_buf + log_buf_len;
+ syslog_data[2] = log_buf + log_end -
+ (logged_chars < log_buf_len ? logged_chars : log_buf_len);
+ syslog_data[3] = log_buf + log_end;
+}
+#endif /* CONFIG_KGDB_KDB */
+
/*
* Call the console drivers on a range of log_buf
*/
@@ -657,7 +759,7 @@
/* If a crash is occurring, make sure we can't deadlock */
spin_lock_init(&logbuf_lock);
/* And make sure that we print immediately */
- init_MUTEX(&console_sem);
+ sema_init(&console_sem, 1);
}
#if defined(CONFIG_PRINTK_TIME)
@@ -706,15 +808,21 @@
va_list args;
int r;
+#ifdef CONFIG_KGDB_KDB
+ if (unlikely(kdb_trap_printk)) {
+ va_start(args, fmt);
+ r = vkdb_printf(fmt, args);
+ va_end(args);
+ return r;
+ }
+#endif
va_start(args, fmt);
r = vprintk(fmt, args);
va_end(args);
return r;
}
-#ifdef CONFIG_DEBUG_LL
-int ll_debug = 0;
-#endif
+
/* cpu currently holding logbuf_lock */
static volatile unsigned int printk_cpu = UINT_MAX;
@@ -742,6 +850,7 @@
* released but interrupts still disabled.
*/
static int acquire_console_semaphore_for_printk(unsigned int cpu)
+ __releases(&logbuf_lock)
{
int retval = 0;
@@ -830,9 +939,6 @@
/* Emit the output into the temporary buffer */
printed_len += vscnprintf(printk_buf + printed_len,
sizeof(printk_buf) - printed_len, fmt, args);
-#ifdef CONFIG_DEBUG_LL
- { extern void printascii(const char *); printascii(printk_buf); }
-#endif
p = printk_buf;
@@ -879,9 +985,9 @@
t = cpu_clock(printk_cpu);
nanosec_rem = do_div(t, 1000000000);
- tlen = sprintf(tbuf, "[%5lu.%06lu] ",
+ tlen = sprintf(tbuf, "[%5lu.%03lu] ",
(unsigned long) t,
- nanosec_rem / 1000);
+ nanosec_rem / 1000000);
for (tp = tbuf; tp < tbuf + tlen; tp++)
emit_log_char(*tp);
@@ -906,15 +1012,8 @@
* will release 'logbuf_lock' regardless of whether it
* actually gets the semaphore or not.
*/
- if (acquire_console_semaphore_for_printk(this_cpu)) {
-#if defined(CONFIG_MV_PRINTK_SLICE_SUPPORT)
- raw_local_irq_restore(flags);
+ if (acquire_console_semaphore_for_printk(this_cpu))
release_console_sem();
- raw_local_irq_save(flags);
-#else
- release_console_sem();
-#endif
- }
lockdep_on();
out_restore_irqs:
@@ -940,6 +1039,10 @@
struct console_cmdline *c;
int i;
+#ifdef CONFIG_BRCMSTB
+ /* Only support one console: the one most recently specified */
+ i = 0;
+#else
/*
* See if this tty is not yet registered, and
* if we have a slot free.
@@ -953,6 +1056,7 @@
}
if (i == MAX_CMDLINECONSOLES)
return -E2BIG;
+#endif
if (!brl_options)
selected_console = i;
c = &console_cmdline[i];
@@ -1090,6 +1194,32 @@
}
/**
+ * console_cpu_notify - print deferred console messages after CPU hotplug
+ * @self: notifier struct
+ * @action: CPU hotplug event
+ * @hcpu: unused
+ *
+ * If printk() is called from a CPU that is not online yet, the messages
+ * will be spooled but will not show up on the console. This function is
+ * called when a new CPU comes online (or fails to come up), and ensures
+ * that any such output gets printed.
+ */
+static int __cpuinit console_cpu_notify(struct notifier_block *self,
+ unsigned long action, void *hcpu)
+{
+ switch (action) {
+ case CPU_ONLINE:
+ case CPU_DEAD:
+ case CPU_DYING:
+ case CPU_DOWN_FAILED:
+ case CPU_UP_CANCELED:
+ acquire_console_sem();
+ release_console_sem();
+ }
+ return NOTIFY_OK;
+}
+
+/**
* acquire_console_sem - lock the console system for exclusive use.
*
* Acquires a semaphore which guarantees that the caller has
@@ -1139,6 +1269,8 @@
int printk_needs_cpu(int cpu)
{
+ if (unlikely(cpu_is_offline(cpu)))
+ printk_tick();
return per_cpu(printk_pending, cpu);
}
@@ -1182,14 +1314,7 @@
break; /* Nothing to print */
_con_start = con_start;
_log_end = log_end;
-#if defined(CONFIG_MV_PRINTK_SLICE_SUPPORT)
- if((_log_end - _con_start) > CONFIG_MV_PRINTK_CHUNK_SIZE) {
- _log_end = (_con_start + CONFIG_MV_PRINTK_CHUNK_SIZE);
- }
- con_start = _log_end;
-#else
con_start = log_end; /* Flush */
-#endif
spin_unlock(&logbuf_lock);
stop_critical_timings(); /* don't trace print latency */
call_console_drivers(_con_start, _log_end);
@@ -1483,7 +1608,7 @@
}
EXPORT_SYMBOL(unregister_console);
-static int __init disable_boot_consoles(void)
+static int __init printk_late_init(void)
{
struct console *con;
@@ -1494,9 +1619,10 @@
unregister_console(con);
}
}
+ hotcpu_notifier(console_cpu_notify, 0);
return 0;
}
-late_initcall(disable_boot_consoles);
+late_initcall(printk_late_init);
#if defined CONFIG_PRINTK
@@ -1508,11 +1634,11 @@
*/
DEFINE_RATELIMIT_STATE(printk_ratelimit_state, 5 * HZ, 10);
-int printk_ratelimit(void)
+int __printk_ratelimit(const char *func)
{
- return __ratelimit(&printk_ratelimit_state);
+ return ___ratelimit(&printk_ratelimit_state, func);
}
-EXPORT_SYMBOL(printk_ratelimit);
+EXPORT_SYMBOL(__printk_ratelimit);
/**
* printk_timed_ratelimit - caller-controlled printk ratelimiting
@@ -1536,4 +1662,125 @@
return false;
}
EXPORT_SYMBOL(printk_timed_ratelimit);
+
+static DEFINE_SPINLOCK(dump_list_lock);
+static LIST_HEAD(dump_list);
+
+#if 0
+/**
+ * kmsg_dump_register - register a kernel log dumper.
+ * @dumper: pointer to the kmsg_dumper structure
+ *
+ * Adds a kernel log dumper to the system. The dump callback in the
+ * structure will be called when the kernel oopses or panics and must be
+ * set. Returns zero on success and %-EINVAL or %-EBUSY otherwise.
+ */
+int kmsg_dump_register(struct kmsg_dumper *dumper)
+{
+ unsigned long flags;
+ int err = -EBUSY;
+
+ /* The dump callback needs to be set */
+ if (!dumper->dump)
+ return -EINVAL;
+
+ spin_lock_irqsave(&dump_list_lock, flags);
+ /* Don't allow registering multiple times */
+ if (!dumper->registered) {
+ dumper->registered = 1;
+ list_add_tail(&dumper->list, &dump_list);
+ err = 0;
+ }
+ spin_unlock_irqrestore(&dump_list_lock, flags);
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(kmsg_dump_register);
+
+/**
+ * kmsg_dump_unregister - unregister a kmsg dumper.
+ * @dumper: pointer to the kmsg_dumper structure
+ *
+ * Removes a dump device from the system. Returns zero on success and
+ * %-EINVAL otherwise.
+ */
+int kmsg_dump_unregister(struct kmsg_dumper *dumper)
+{
+ unsigned long flags;
+ int err = -EINVAL;
+
+ spin_lock_irqsave(&dump_list_lock, flags);
+ if (dumper->registered) {
+ dumper->registered = 0;
+ list_del(&dumper->list);
+ err = 0;
+ }
+ spin_unlock_irqrestore(&dump_list_lock, flags);
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(kmsg_dump_unregister);
+
+static const char * const kmsg_reasons[] = {
+ [KMSG_DUMP_OOPS] = "oops",
+ [KMSG_DUMP_PANIC] = "panic",
+ [KMSG_DUMP_KEXEC] = "kexec",
+};
+
+static const char *kmsg_to_str(enum kmsg_dump_reason reason)
+{
+ if (reason >= ARRAY_SIZE(kmsg_reasons) || reason < 0)
+ return "unknown";
+
+ return kmsg_reasons[reason];
+}
+
+/**
+ * kmsg_dump - dump kernel log to kernel message dumpers.
+ * @reason: the reason (oops, panic etc) for dumping
+ *
+ * Iterate through each of the dump devices and call the oops/panic
+ * callbacks with the log buffer.
+ */
+void kmsg_dump(enum kmsg_dump_reason reason)
+{
+ unsigned long end;
+ unsigned chars;
+ struct kmsg_dumper *dumper;
+ const char *s1, *s2;
+ unsigned long l1, l2;
+ unsigned long flags;
+
+ /* Theoretically, the log could move on after we do this, but
+ there's not a lot we can do about that. The new messages
+ will overwrite the start of what we dump. */
+ spin_lock_irqsave(&logbuf_lock, flags);
+ end = log_end & LOG_BUF_MASK;
+ chars = logged_chars;
+ spin_unlock_irqrestore(&logbuf_lock, flags);
+
+ if (chars > end) {
+ s1 = log_buf + log_buf_len - chars + end;
+ l1 = chars - end;
+
+ s2 = log_buf;
+ l2 = end;
+ } else {
+ s1 = "";
+ l1 = 0;
+
+ s2 = log_buf + end - chars;
+ l2 = chars;
+ }
+
+ if (!spin_trylock_irqsave(&dump_list_lock, flags)) {
+ printk(KERN_ERR "dump_kmsg: dump list lock is held during %s, skipping dump\n",
+ kmsg_to_str(reason));
+ return;
+ }
+ list_for_each_entry(dumper, &dump_list, list)
+ dumper->dump(dumper, reason, s1, l1, s2, l2);
+ spin_unlock_irqrestore(&dump_list_lock, flags);
+}
+#endif
#endif
diff --git a/lib/ratelimit.c b/lib/ratelimit.c
index 26187ed..eeab10f 100644
--- a/lib/ratelimit.c
+++ b/lib/ratelimit.c
@@ -23,7 +23,7 @@
* This enforces a rate limit: not more than @rs->ratelimit_burst callbacks
* in every @rs->ratelimit_jiffies
*/
-int __ratelimit(struct ratelimit_state *rs)
+int ___ratelimit(struct ratelimit_state *rs, const char *func)
{
unsigned long flags;
@@ -37,7 +37,7 @@
if (time_is_before_jiffies(rs->begin + rs->interval)) {
if (rs->missed)
printk(KERN_WARNING "%s: %d callbacks suppressed\n",
- __func__, rs->missed);
+ func, rs->missed);
rs->begin = 0;
rs->printed = 0;
rs->missed = 0;
@@ -54,4 +54,4 @@
spin_unlock_irqrestore(&ratelimit_lock, flags);
return 1;
}
-EXPORT_SYMBOL(__ratelimit);
+EXPORT_SYMBOL(___ratelimit);
diff --git a/mm/bootmem.c b/mm/bootmem.c
index 555d5d2..458c2ca 100644
--- a/mm/bootmem.c
+++ b/mm/bootmem.c
@@ -318,7 +318,10 @@
return 0;
pos = bdata->node_low_pfn;
}
- BUG();
+ if (reserve && (flags & BOOTMEM_EXCLUSIVE))
+ return -ENOENT; /* not a bug as long as you use EXCLUSIVE */
+ else
+ BUG();
}
/**
