ARM: bitops: prefetch the destination word for write prior to strex

[~andy/linux] / arch / arm / lib / bitops.h

diff --git a/arch/arm/lib/bitops.h b/arch/arm/lib/bitops.h
index d6408d1ee543fe5e3ceabbcda01b25efb07676ba..e0c68d5bb7dc25dd3fa93dc0fa1b3899f5b09019 100644 (file)
--- a/arch/arm/lib/bitops.h
+++ b/arch/arm/lib/bitops.h
@@ -10,6 +10,11 @@ UNWIND(      .fnstart        )
        and     r3, r0, #31             @ Get bit offset
        mov     r0, r0, lsr #5
        add     r1, r1, r0, lsl #2      @ Get word offset
+#if __LINUX_ARM_ARCH__ >= 7
+       .arch_extension mp
+       ALT_SMP(W(pldw) [r1])
+       ALT_UP(W(nop))
+#endif
        mov     r3, r2, lsl r3
 1:     ldrex   r2, [r1]
        \instr  r2, r2, r3