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Merge branch 'x86-alternatives-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

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* 'x86-alternatives-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86, alternatives: BUG on encountering an invalid CPU feature number
  x86, alternatives: Fix one more open-coded 8-bit alternative number
  x86, alternatives: Use 16-bit numbers for cpufeature index
This commit is contained in:
Linus Torvalds
2010-08-06 16:24:17 -07:00
parent 75cb5fdce2 3b770a2128
commit 66cd55d2b9
9 changed files with 19 additions and 15 deletions
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14
arch/x86/include/asm/cpufeature.h
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@@ -302,7 +302,7 @@ extern const char * const x86_power_flags[32];
* patch the target code for additional performance.
*
*/
static __always_inline __pure bool __static_cpu_has(u8 bit)
static __always_inline __pure bool __static_cpu_has(u16 bit)
{
#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5)
asm goto("1: jmp %l[t_no]\n"
@@ -311,11 +311,11 @@ static __always_inline __pure bool __static_cpu_has(u8 bit)
_ASM_ALIGN "\n"
_ASM_PTR "1b\n"
_ASM_PTR "0\n" /* no replacement */
" .byte %P0\n" /* feature bit */
" .word %P0\n" /* feature bit */
" .byte 2b - 1b\n" /* source len */
" .byte 0\n" /* replacement len */
" .byte 0xff + 0 - (2b-1b)\n" /* padding */
".previous\n"
/* skipping size check since replacement size = 0 */
: : "i" (bit) : : t_no);
return true;
t_no:
@@ -329,10 +329,12 @@ static __always_inline __pure bool __static_cpu_has(u8 bit)
_ASM_ALIGN "\n"
_ASM_PTR "1b\n"
_ASM_PTR "3f\n"
" .byte %P1\n" /* feature bit */
" .word %P1\n" /* feature bit */
" .byte 2b - 1b\n" /* source len */
" .byte 4f - 3f\n" /* replacement len */
" .byte 0xff + (4f-3f) - (2b-1b)\n" /* padding */
".previous\n"
".section .discard,\"aw\",@progbits\n"
" .byte 0xff + (4f-3f) - (2b-1b)\n" /* size check */
".previous\n"
".section .altinstr_replacement,\"ax\"\n"
"3: movb $1,%0\n"
@@ -348,7 +350,7 @@ static __always_inline __pure bool __static_cpu_has(u8 bit)
( \
__builtin_constant_p(boot_cpu_has(bit)) ? \
boot_cpu_has(bit) : \
(__builtin_constant_p(bit) && !((bit) & ~0xff)) ? \
__builtin_constant_p(bit) ? \
__static_cpu_has(bit) : \
boot_cpu_has(bit) \
)