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x86, alternative: Use .pushsection/.popsection

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.section/.previous doesn't nest.  Use .pushsection/.popsection in
<asm/alternative.h> so that they can be properly nested.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Link: http://lkml.kernel.org/r/1348256595-29119-5-git-send-email-hpa@linux.intel.com
This commit is contained in:
H. Peter Anvin 2012-09-21 12:43:08 -07:00
parent 85fdf05cc3
commit 9cebed423c
2 changed files with 18 additions and 18 deletions
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4
arch/x86/include/asm/alternative-asm.h
View File

@ -5,10 +5,10 @@
#ifdef CONFIG_SMP
.macro LOCK_PREFIX
672: lock
.section .smp_locks,"a"
.pushsection .smp_locks,"a"
.balign 4
.long 672b - .
.previous
.popsection
.endm
#else
.macro LOCK_PREFIX

32
arch/x86/include/asm/alternative.h
View File

@ -29,10 +29,10 @@
#ifdef CONFIG_SMP
#define LOCK_PREFIX_HERE \
".section .smp_locks,\"a\"\n" \
".balign 4\n" \
".long 671f - .\n" /* offset */ \
".previous\n" \
".pushsection .smp_locks,\"a\"\n" \
".balign 4\n" \
".long 671f - .\n" /* offset */ \
".popsection\n" \
"671:"
#define LOCK_PREFIX LOCK_PREFIX_HERE "\n\tlock; "
@ -99,30 +99,30 @@ static inline int alternatives_text_reserved(void *start, void *end)
/* alternative assembly primitive: */
#define ALTERNATIVE(oldinstr, newinstr, feature) \
OLDINSTR(oldinstr) \
".section .altinstructions,\"a\"\n" \
".pushsection .altinstructions,\"a\"\n" \
ALTINSTR_ENTRY(feature, 1) \
".previous\n" \
".section .discard,\"aw\",@progbits\n" \
".popsection\n" \
".pushsection .discard,\"aw\",@progbits\n" \
DISCARD_ENTRY(1) \
".previous\n" \
".section .altinstr_replacement, \"ax\"\n" \
".popsection\n" \
".pushsection .altinstr_replacement, \"ax\"\n" \
ALTINSTR_REPLACEMENT(newinstr, feature, 1) \
".previous"
".popsection"
#define ALTERNATIVE_2(oldinstr, newinstr1, feature1, newinstr2, feature2)\
OLDINSTR(oldinstr) \
".section .altinstructions,\"a\"\n" \
".pushsection .altinstructions,\"a\"\n" \
ALTINSTR_ENTRY(feature1, 1) \
ALTINSTR_ENTRY(feature2, 2) \
".previous\n" \
".section .discard,\"aw\",@progbits\n" \
".popsection\n" \
".pushsection .discard,\"aw\",@progbits\n" \
DISCARD_ENTRY(1) \
DISCARD_ENTRY(2) \
".previous\n" \
".section .altinstr_replacement, \"ax\"\n" \
".popsection\n" \
".pushsection .altinstr_replacement, \"ax\"\n" \
ALTINSTR_REPLACEMENT(newinstr1, feature1, 1) \
ALTINSTR_REPLACEMENT(newinstr2, feature2, 2) \
".previous"
".popsection"
/*
* This must be included *after* the definition of ALTERNATIVE due to