sparc64: Use pause instruction when available.

[can-eth-gw-linux.git] / arch / sparc / include / asm / backoff.h

diff --git a/arch/sparc/include/asm/backoff.h b/arch/sparc/include/asm/backoff.h
index 64b077b3b13b31e2a36c65c714e29ae72c08acad..20f01df0871b18eac5e7007ca2db3605847e3d18 100644 (file)
--- a/arch/sparc/include/asm/backoff.h
+++ b/arch/sparc/include/asm/backoff.h
@@ -11,19 +11,25 @@
 #define BACKOFF_LABEL(spin_label, continue_label) \
        spin_label
 
-#define BACKOFF_SPIN(reg, tmp, label)  \
-       mov     reg, tmp; \
-88:    rd      %ccr, %g0; \
-       rd      %ccr, %g0; \
-       rd      %ccr, %g0; \
-       brnz,pt tmp, 88b; \
-        sub    tmp, 1, tmp; \
-       set     BACKOFF_LIMIT, tmp; \
-       cmp     reg, tmp; \
-       bg,pn   %xcc, label; \
-        nop; \
-       ba,pt   %xcc, label; \
-        sllx   reg, 1, reg;
+#define BACKOFF_SPIN(reg, tmp, label)          \
+       mov             reg, tmp;               \
+88:    rd              %ccr, %g0;              \
+       rd              %ccr, %g0;              \
+       rd              %ccr, %g0;              \
+       .section        .pause_patch,"ax";      \
+       .word           88b;                    \
+       sllx            tmp, 7, tmp;            \
+       wr              tmp, 0, %asr27;         \
+       clr             tmp;                    \
+       .previous;                              \
+       brnz,pt         tmp, 88b;               \
+        sub            tmp, 1, tmp;            \
+       set             BACKOFF_LIMIT, tmp;     \
+       cmp             reg, tmp;               \
+       bg,pn           %xcc, label;            \
+        nop;                                   \
+       ba,pt           %xcc, label;            \
+        sllx           reg, 1, reg;
 
 #else