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authorBart Van Assche <bart.vanassche@gmail.com>2013-05-21 20:43:50 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-07-21 18:14:41 -0700
commit7bcb3df9ab6ae35c239bb6fc051dd478ed47991e (patch)
tree4f76f762f5c949c0ca8a0a01d0d0c68e7c48be91
parentb53a038e4d4e68ebbee7eddbd9c8793d75c5fe3f (diff)
downloadlwn-7bcb3df9ab6ae35c239bb6fc051dd478ed47991e.tar.gz
lwn-7bcb3df9ab6ae35c239bb6fc051dd478ed47991e.zip
timer: Fix jiffies wrap behavior of round_jiffies_common()
commit 9e04d3804d3ac97d8c03a41d78d0f0674b5d01e1 upstream. Direct compare of jiffies related values does not work in the wrap around case. Replace it with time_is_after_jiffies(). Signed-off-by: Bart Van Assche <bvanassche@acm.org> Cc: Arjan van de Ven <arjan@infradead.org> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Link: http://lkml.kernel.org/r/519BC066.5080600@acm.org Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--kernel/timer.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/kernel/timer.c b/kernel/timer.c
index 45a2f2960582..5eac0d85ca59 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -145,9 +145,11 @@ static unsigned long round_jiffies_common(unsigned long j, int cpu,
/* now that we have rounded, subtract the extra skew again */
j -= cpu * 3;
- if (j <= jiffies) /* rounding ate our timeout entirely; */
- return original;
- return j;
+ /*
+ * Make sure j is still in the future. Otherwise return the
+ * unmodified value.
+ */
+ return time_is_after_jiffies(j) ? j : original;
}
/**