Messages in this thread Patch in this message | | | Date | Thu, 22 Sep 2011 11:53:35 +0900 | From | mhban <> | Subject | [PATCH] ARM: futex: fix clobbering oldval |
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This patch fixes clobbering oldval bug. oldval should be preserved for next compare operation.
Change-Id: I2a63bc1bdb8de330eb9e1ac02d7da1f77e6e8c3c Signed-off-by: Minho Ban <mhban@samsung.com> --- arch/arm/include/asm/futex.h | 6 +++--- 1 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/arm/include/asm/futex.h b/arch/arm/include/asm/futex.h index d2d733c..b0f2e8e 100644 --- a/arch/arm/include/asm/futex.h +++ b/arch/arm/include/asm/futex.h @@ -30,14 +30,14 @@ __asm__ __volatile__( \ "1: ldrex %1, [%2]\n" \ " " insn "\n" \ - "2: strex %1, %0, [%2]\n" \ - " teq %1, #0\n" \ + "2: strex r5, %0, [%2]\n" \ + " teq r5, #0\n" \ " bne 1b\n" \ " mov %0, #0\n" \ __futex_atomic_ex_table("%4") \ : "=&r" (ret), "=&r" (oldval) \ : "r" (uaddr), "r" (oparg), "Ir" (-EFAULT) \ - : "cc", "memory") + : "r5", "cc", "memory") static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, -- 1.7.0.4
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