From deaf7e1cc65f3562cb47acf3650c64834afaa434 Mon Sep 17 00:00:00 2001 From: Oleg Drokin Date: Sat, 6 Feb 2016 02:12:12 -0500 Subject: [PATCH] staging/lustre/lnet: Don't call roundup_pow_of_two on zero in LNetEQAlloc roundup_pow_of_two return when called on a zero argument is undefined, so don't call it like that. This fixes a problem introduced by commit 322489d9d551 ("staging/lustre: Use roundup_pow_of_two() in LNetEQAlloc()") since 0 is a valid count parameter for LNetEQAlloc. Also manifesting itself as an annoying kernel warning: LNet: 3486:0:(lib-eq.c:85:LNetEQAlloc()) EQ callback is guaranteed to get every event, do you still want to set eqcount 1 for polling event which will have locking overhead? Please contact with developer to confirm Signed-off-by: Oleg Drokin CC: Pekka Enberg Signed-off-by: Greg Kroah-Hartman --- drivers/staging/lustre/lnet/lnet/lib-eq.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/staging/lustre/lnet/lnet/lib-eq.c b/drivers/staging/lustre/lnet/lnet/lib-eq.c index 64f94a6..bfbc313 100644 --- a/drivers/staging/lustre/lnet/lnet/lib-eq.c +++ b/drivers/staging/lustre/lnet/lnet/lib-eq.c @@ -79,7 +79,8 @@ LNetEQAlloc(unsigned int count, lnet_eq_handler_t callback, * overflow, they don't skip entries, so the queue has the same * apparent capacity at all times */ - count = roundup_pow_of_two(count); + if (count) + count = roundup_pow_of_two(count); if (callback != LNET_EQ_HANDLER_NONE && count != 0) CWARN("EQ callback is guaranteed to get every event, do you still want to set eqcount %d for polling event which will have locking overhead? Please contact with developer to confirm\n", count); -- 2.7.4