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Hexagon: fix __atomic_add_unless

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Signed-off-by: Richard Kuo <rkuo@codeaurora.org>
This commit is contained in:
Richard Kuo 2013-03-21 18:24:19 -05:00
parent 22493cfd78
commit e0025a72c3
1 changed files with 11 additions and 9 deletions
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20
arch/hexagon/include/asm/atomic.h
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@ -117,35 +117,37 @@ static inline int atomic_sub_return(int i, atomic_t *v)
#define atomic_sub(i, v) atomic_sub_return(i, (v)) #define atomic_sub(i, v) atomic_sub_return(i, (v))
/** /**
* atomic_add_unless - add unless the number is a given value * __atomic_add_unless - add unless the number is a given value
* @v: pointer to value * @v: pointer to value
* @a: amount to add * @a: amount to add
* @u: unless value is equal to u * @u: unless value is equal to u
* *
* Returns 1 if the add happened, 0 if it didn't. * Returns old value.
*
*/ */
static inline int __atomic_add_unless(atomic_t *v, int a, int u) static inline int __atomic_add_unless(atomic_t *v, int a, int u)
{ {
int output, __oldval; int __oldval;
register int tmp;
asm volatile( asm volatile(
"1: %0 = memw_locked(%2);" "1: %0 = memw_locked(%2);"
" {" " {"
" p3 = cmp.eq(%0, %4);" " p3 = cmp.eq(%0, %4);"
" if (p3.new) jump:nt 2f;" " if (p3.new) jump:nt 2f;"
" %0 = add(%0, %3);" " %1 = add(%0, %3);"
" %1 = #0;"
" }" " }"
" memw_locked(%2, p3) = %0;" " memw_locked(%2, p3) = %1;"
" {" " {"
" if !p3 jump 1b;" " if !p3 jump 1b;"
" %1 = #1;"
" }" " }"
"2:" "2:"
: "=&r" (__oldval), "=&r" (output) : "=&r" (__oldval), "=&r" (tmp)
: "r" (v), "r" (a), "r" (u) : "r" (v), "r" (a), "r" (u)
: "memory", "p3" : "memory", "p3"
); );
return output; return __oldval;
} }
#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)