tree ad128ffb2e65e538216d00f97c3d4f3e0748f83f
parent 756723ad553d02553397ea991c28812b91aa6cda
author David S. Miller <davem@davemloft.net> 1471297674 -0700
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1479719201 +0100

sparc64: Prepare to move to more saner user copy exception handling.

[ Upstream commit 83a17d2661674d8c198adc0e183418f72aabab79 ]

The fixup helper function mechanism for handling user copy fault
handling is not %100 accurrate, and can never be made so.

We are going to transition the code to return the running return
return length, which is always kept track in one or more registers
of each of these routines.

In order to convert them one by one, we have to allow the existing
behavior to continue functioning.

Therefore make all the copy code that wants the fixup helper to be
used return negative one.

After all of the user copy routines have been converted, this logic
and the fixup helpers themselves can be removed completely.

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>