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| author | Jan Beulich <JBeulich@novell.com> | 2009-12-18 17:12:56 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-12-30 11:57:31 +0100 |
| commit | 1b1d9258181bae199dc940f4bd0298126b9a73d9 (patch) | |
| tree | b17ca149d943051fc76e79b75fc4b89c61b524a2 /arch/x86/lib | |
| parent | x86: Lift restriction on the location of FIX_BTMAP_* (diff) | |
| download | linux-1b1d9258181bae199dc940f4bd0298126b9a73d9.tar.xz linux-1b1d9258181bae199dc940f4bd0298126b9a73d9.zip | |
x86-64: Modify copy_user_generic() alternatives mechanism
In order to avoid unnecessary chains of branches, rather than
implementing copy_user_generic() as a function consisting of
just a single (possibly patched) branch, instead properly deal
with patching call instructions in the alternative instructions
framework, and move the patching into the callers.
As a follow-on, one could also introduce something like
__EXPORT_SYMBOL_ALT() to avoid patching call sites in modules.
Signed-off-by: Jan Beulich <jbeulich@novell.com>
Cc: Nick Piggin <npiggin@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
LKML-Reference: <4B2BB8180200007800026AE7@vpn.id2.novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/lib')
| -rw-r--r-- | arch/x86/lib/copy_user_64.S | 6 |
1 files changed, 0 insertions, 6 deletions
diff --git a/arch/x86/lib/copy_user_64.S b/arch/x86/lib/copy_user_64.S index cf889d4e076a..71100c98e337 100644 --- a/arch/x86/lib/copy_user_64.S +++ b/arch/x86/lib/copy_user_64.S @@ -90,12 +90,6 @@ ENTRY(_copy_from_user) CFI_ENDPROC ENDPROC(_copy_from_user) -ENTRY(copy_user_generic) - CFI_STARTPROC - ALTERNATIVE_JUMP X86_FEATURE_REP_GOOD,copy_user_generic_unrolled,copy_user_generic_string - CFI_ENDPROC -ENDPROC(copy_user_generic) - .section .fixup,"ax" /* must zero dest */ ENTRY(bad_from_user) |