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timers: Fix slack calculation really 

commit f00e047ef (timers: Fix slack calculation for expired timers)
fixed the issue of slack on expired timers only partially. Linus
noticed that jiffies is volatile so it is reloaded twice, which
generates bad code.

But its worse. This can defeat the time_after() check if jiffies are
incremented between time_after() and the slack calculation.

Fix it by reading jiffies into a local variable, which prevents the
compiler from loading it twice. While at it make the > -1 check into
>= 0 which is easier to read.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Thomas Gleixner 2010-05-25 20:43:30 +02:00
parent f16a5e3478
commit 8e63d7795e
1 changed files with 8 additions and 5 deletions
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13
kernel/timer.c
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@ -747,16 +747,19 @@ EXPORT_SYMBOL(mod_timer_pending);
static inline
unsigned long apply_slack(struct timer_list *timer, unsigned long expires)
{
unsigned long expires_limit, mask;
unsigned long expires_limit, mask, now;
int bit;
expires_limit = expires;
if (timer->slack > -1)
if (timer->slack >= 0) {
expires_limit = expires + timer->slack;
else if (time_after(expires, jiffies)) /* auto slack: use 0.4% */
expires_limit = expires + (expires - jiffies)/256;
} else {
now = jiffies;
/* No slack, if already expired else auto slack 0.4% */
if (time_after(expires, now))
expires_limit = expires + (expires - now)/256;
}
mask = expires ^ expires_limit;
if (mask == 0)
return expires;