lkml.org 
[lkml]   [2016]   [Feb]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] staging/lustre/lnet: Don't call roundup_pow_of_two on zero in LNetEQAlloc
Date
From: Oleg Drokin <green@linuxhacker.ru>

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 <green@linuxhacker.ru>
CC: Pekka Enberg <penberg@kernel.org>
---
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);
--
2.1.0
\
 
 \ /
  Last update: 2016-02-06 08:21    [W:0.434 / U:0.056 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site