SPARC64: Fix atomic backoff limit.

Upstream commit: 4cfea5a7dfcc2766251e50ca30271a782d5004ad

4096 will not fit into the immediate field of a compare instruction,
in fact it will end up being -4096 causing the check to fail every
time and thus disabling backoff.

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>

diff --git a/include/asm-sparc64/backoff.h b/include/asm-sparc64/backoff.h
index dadd6c385c6c0f31bb6c40f0b27af1e478e90d2a..fa1fdf67e350e07d950107289f25bdf3c41a73b3 100644 (file)
--- a/include/asm-sparc64/backoff.h
+++ b/include/asm-sparc64/backoff.h
@@ -12,7 +12,8 @@
        mov     reg, tmp; \
 88:    brnz,pt tmp, 88b; \
         sub    tmp, 1, tmp; \
-       cmp     reg, BACKOFF_LIMIT; \
+       set     BACKOFF_LIMIT, tmp; \
+       cmp     reg, tmp; \
        bg,pn   %xcc, label; \
         nop; \
        ba,pt   %xcc, label; \