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metag: Fix atomic_*_return inline asm constraints

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commit 096a8b6d5e upstream.

The argument i of atomic_*_return() operations is given to inline asm
with the "bd" constraint, which means "An Op2 register where Op1 is a
data unit register and the instruction supports O2R", however Op1 is
constrained by "da" which allows an address unit register to be used.

Fix the constraint to use "br", meaning "An Op2 register and the
instruction supports O2R", i.e. not requiring Op1 to be a data unit
register.

Fixes: d6dfe2509d ("locking,arch,metag: Fold atomic_ops")
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: linux-metag@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
James Hogan
2016-05-03 09:11:21 +01:00
committed by Greg Kroah-Hartman
parent 6f0caecda5
commit 73e6305cf0
1 changed files with 1 additions and 1 deletions
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2
arch/metag/include/asm/atomic_lnkget.h
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@@ -61,7 +61,7 @@ static inline int atomic_##op##_return(int i, atomic_t *v) \
" CMPT %0, #HI(0x02000000)\n" \
" BNZ 1b\n" \
: "=&d" (temp), "=&da" (result) \
: "da" (&v->counter), "bd" (i) \
: "da" (&v->counter), "br" (i) \
: "cc"); \
\
smp_mb(); \