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

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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>
This commit is contained in:
David S. Miller
2016-08-15 14:47:54 -07:00
parent aa95ce361e
commit 83a17d2661
15 changed files with 47 additions and 39 deletions
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4
arch/sparc/lib/U3copy_from_user.S
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@@ -7,7 +7,7 @@
98: x; \
.section __ex_table,"a";\
.align 4; \
.word 98b, __retl_one; \
.word 98b, __retl_mone; \
.text; \
.align 4;
@@ -15,7 +15,7 @@
98: x; \
.section __ex_table,"a";\
.align 4; \
.word 98b, __retl_one_fp;\
.word 98b, __retl_mone_fp;\
.text; \
.align 4;