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[PATCH] i386: rwlock.h fix smp alternatives fix 

Commit 8c74932779 ("i386: Remove
alternative_smp") did not actually compile on x86 with CONFIG_SMP.

This fixes the __build_read/write_lock helpers.  I've boot tested on
SMP.

[ Andi: "Oops, I think that was a quilt unrefreshed patch.  Sorry.  I
  fixed those before testing, but then still send out the old patch." ]

Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Cc: Gerd Hoffmann <kraxel@suse.de>
Acked-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
hifive-unleashed-5.1
Chris Wright 2006-08-31 00:53:22 -07:00 committed by Linus Torvalds
parent 4c15343167
commit 22db37ec5f
1 changed files with 11 additions and 13 deletions
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24
include/asm-i386/rwlock.h
View File

@ -21,21 +21,21 @@
#define RW_LOCK_BIAS_STR "0x01000000"
#define __build_read_lock_ptr(rw, helper) \
asm volatile(LOCK_PREFIX " ; subl $1,(%0)\n\t" \
asm volatile(LOCK_PREFIX " subl $1,(%0)\n\t" \
"jns 1f\n" \
"call " helper "\n\t" \
"1:\n" \
:"a" (rw) : "memory")
::"a" (rw) : "memory")
#define __build_read_lock_const(rw, helper) \
asm volatile(LOCK_PREFIX " ; subl $1,%0\n\t" \
asm volatile(LOCK_PREFIX " subl $1,%0\n\t" \
"jns 1f\n" \
"pushl %%eax\n\t" \
"leal %0,%%eax\n\t" \
"call " helper "\n\t" \
"popl %%eax\n\t" \
"1:\n" : \
"+m" (*(volatile int *)rw) : : "memory")
"1:\n" \
:"+m" (*(volatile int *)rw) : : "memory")
#define __build_read_lock(rw, helper) do { \
if (__builtin_constant_p(rw)) \
@ -45,23 +45,21 @@
} while (0)
#define __build_write_lock_ptr(rw, helper) \
asm volatile(LOCK_PREFIX " ; subl $" RW_LOCK_BIAS_STR ",(%0)\n\t" \
asm volatile(LOCK_PREFIX " subl $" RW_LOCK_BIAS_STR ",(%0)\n\t" \
"jz 1f\n" \
"call " helper "\n\t" \
"1:\n", \
"subl $" RW_LOCK_BIAS_STR ",(%0)\n\t", \
:"a" (rw) : "memory")
"1:\n" \
::"a" (rw) : "memory")
#define __build_write_lock_const(rw, helper) \
asm volatile(LOCK_PREFIX " ; subl $" RW_LOCK_BIAS_STR ",%0\n\t" \
asm volatile(LOCK_PREFIX " subl $" RW_LOCK_BIAS_STR ",%0\n\t" \
"jz 1f\n" \
"pushl %%eax\n\t" \
"leal %0,%%eax\n\t" \
"call " helper "\n\t" \
"popl %%eax\n\t" \
"1:\n", \
"subl $" RW_LOCK_BIAS_STR ",%0\n\t", \
"+m" (*(volatile int *)rw) : : "memory")
"1:\n" \
:"+m" (*(volatile int *)rw) : : "memory")
#define __build_write_lock(rw, helper) do { \
if (__builtin_constant_p(rw)) \