| Date | Wed, 16 Apr 2008 18:02:05 -0700 | From | Chris Wright <> | Subject | SPARC64: Fix atomic backoff limit. |
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-stable review patch. If anyone has any objections, please let us know. ---------------------
From: David S. Miller <davem@davemloft.net>
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> --- 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; \ --
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