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[SPARC64]: Fix futex_atomic_cmpxchg_inatomic implementation. 

I copied the logic from ll/sc arch implementations, but that
was wrong and makes no sense at all.  Just do a straight
compare-exchange instruction, just like x86.

Based upon bug reports from Dennis Gilmore and Fabio Massimo.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2006-11-01 16:30:39 -08:00
parent 3ccfc65c50
commit c7fed9d750
1 changed files with 8 additions and 10 deletions
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18
include/asm-sparc64/futex.h
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@ -87,24 +87,22 @@ static inline int
futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
{
__asm__ __volatile__(
"\n1: lduwa [%2] %%asi, %0\n"
"2: casa [%2] %%asi, %0, %1\n"
"3:\n"
"\n1: casa [%3] %%asi, %2, %0\n"
"2:\n"
" .section .fixup,#alloc,#execinstr\n"
" .align 4\n"
"4: ba 3b\n"
" mov %3, %0\n"
"3: ba 2b\n"
" mov %4, %0\n"
" .previous\n"
" .section __ex_table,\"a\"\n"
" .align 4\n"
" .word 1b, 4b\n"
" .word 2b, 4b\n"
" .word 1b, 3b\n"
" .previous\n"
: "=&r" (oldval)
: "r" (newval), "r" (uaddr), "i" (-EFAULT)
: "=r" (newval)
: "0" (newval), "r" (oldval), "r" (uaddr), "i" (-EFAULT)
: "memory");
return oldval;
return newval;
}
#endif /* !(_SPARC64_FUTEX_H) */