SPARC64: Fix atomic backoff limit.

[Chris Wright]

-stable review patch.  If anyone has any objections, please let us know.
---------------------

From: David S. Miller <davem@xxxxxxxxxxxxx>

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@xxxxxxxxxxxxx>
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>
---
 include/asm-sparc64/backoff.h |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- 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; \

-- 
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/