Revert "ARCv2: spinlock/rwlock/atomics: reduce 1 instruction in exponential backoff"

[cascardo/linux.git] / arch / arc / include / asm / atomic.h

diff --git a/arch/arc/include/asm/atomic.h b/arch/arc/include/asm/atomic.h
index 5f3dcbb..75c8226 100644 (file)
--- a/arch/arc/include/asm/atomic.h
+++ b/arch/arc/include/asm/atomic.h
@@ -36,7 +36,8 @@
        "       mov     %[tmp], %[delay]        \n"     /* tmp = delay */       \
        "2:     brne.d  %[tmp], 0, 2b           \n"     /* while (tmp != 0) */  \
        "       sub     %[tmp], %[tmp], 1       \n"     /* tmp-- */             \
-       "       rol     %[delay], %[delay]      \n"     /* delay *= 2 */        \
+       "       asl.f   %[delay], %[delay], 1   \n"     /* delay *= 2 */        \
+       "       mov.z   %[delay], 1             \n"     /* handle overflow */   \
        "       b       1b                      \n"     /* start over */        \
        "4: ; --- success ---                   \n"                             \