Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

Conflicts:

	include/asm-powerpc/unistd.h
	include/asm-sparc/unistd.h
	include/asm-sparc64/unistd.h

Signed-off-by: David Woodhouse <dwmw2@infradead.org>

1 files changed, 16 insertions, 0 deletions

diff --git a/kernel/timer.c b/kernel/timer.c
index 67eaf0f54096..9e49deed468c 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -541,6 +541,22 @@ found:
         }
         spin_unlock(&base->lock);
 
+        /*
+         * It can happen that other CPUs service timer IRQs and increment
+         * jiffies, but we have not yet got a local timer tick to process
+         * the timer wheels.  In that case, the expiry time can be before
+         * jiffies, but since the high-resolution timer here is relative to
+         * jiffies, the default expression when high-resolution timers are
+         * not active,
+         *
+         *   time_before(MAX_JIFFY_OFFSET + jiffies, expires)
+         *
+         * would falsely evaluate to true.  If that is the case, just
+         * return jiffies so that we can immediately fire the local timer
+         */
+        if (time_before(expires, jiffies))
+                return jiffies;
+
         if (time_before(hr_expires, expires))
                 return hr_expires;