This mistake comes from the commit f1e39a4a616cd99 ("MIPS: Rewrite
sysmips(MIPS_ATOMIC_SET, ...) in C with inline assembler"). In the
common case 'bnez' should be 'beqz' (as same as older kernels before
2.6.32), otherwise this syscall may cause an endless loop.
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Huacai Chen <chenhc@xxxxxxxxxx>
---
arch/mips/kernel/syscall.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/mips/kernel/syscall.c b/arch/mips/kernel/syscall.c
index 1dfa7f5..95e1b30 100644
--- a/arch/mips/kernel/syscall.c
+++ b/arch/mips/kernel/syscall.c
@@ -134,7 +134,7 @@ static inline int mips_atomic_set(unsigned long addr, unsigned long new)
"1: ll %[old], (%[addr]) \n"
" move %[tmp], %[new] \n"
"2: sc %[tmp], (%[addr]) \n"
- " bnez %[tmp], 4f \n"
+ " beqz %[tmp], 4f \n"
"3: \n"
" .insn \n"
" .subsection 2 \n"
--
2.7.0
