linux/kernel, branch v2.6.21-rc5

[PATCH] clocksource: Fix thinko in watchdog selection

2007-03-25T21:57:34Z

The watchdog implementation excludes low res / non continuous clocksources from being selected as a watchdog reference unintentionally. Allow using jiffies/PIT as a watchdog reference as long as no better clocksource is available. This is necessary to detect TSC breakage on systems, which have no pmtimer/hpet. The main goal of the initial patch (preventing to switch to highres/nohz when no reliable fallback clocksource is available) is still guaranteed by the checks in clocksource_watchdog(). Signed-off-by: Thomas Gleixner Signed-off-by: Linus Torvalds

[PATCH] dynticks: fix hrtimer rounding error in next_timer_interrupt

2007-03-25T21:57:34Z

The rework of next_timer_interrupt() fixed the timer wheel bugs, but invented a rounding error versus the next hrtimer event. This is caused by the conversion of the hrtimer internal representation to relative jiffies. This causes bug #8100: http://bugzilla.kernel.org/show_bug.cgi?id=8100 next_timer_interrupt() returns "now" in such a case and causes the code in tick_nohz_stop_sched_tick() to trigger the timer softirq, which is bogus as no timer is due for expiry. This results in an endless context switching between idle and ksoftirqd until a timer is due for expiry. Modify the hrtimer evaluation so that, it returns now + 1, when the conversion results in a delta < 1 jiffie. It's confirmed to resolve bug #8100 Reported-by: Emil Karlson Signed-off-by: Thomas Gleixner Signed-off-by: Linus Torvalds

[PATCH] time: fix formatting in /proc/timer_list

2007-03-23T18:01:21Z

Fix the print formatting of three unsigned long fields in /proc/timer_list, which are currently being formatted as signed long. Signed-off-by: James Morris Acked-by: Ingo Molnar Cc: Thomas Gleixner Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] lockdep: debug_show_all_locks & debug_show_held_locks vs. debug_locks

2007-03-23T02:39:06Z

lockdep's data shouldn't be used when debug_locks == 0 because it's not updated after this, so it's more misleading than helpful. PS: probably lockdep's current-> fields should be reset after it turns debug_locks off: so, after printing a bug report, but before return from exported functions, but there are really a lot of these possibilities (e.g. after DEBUG_LOCKS_WARN_ON), so, something could be missed. (Of course direct use of this fields isn't recommended either.) Reported-by: Folkert van Heusden Inspired-by: Oleg Nesterov Signed-off-by: Jarek Poplawski Acked-by: Peter Zijlstra Cc: Ingo Molnar Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] fix extra BIOS invocation during resume

2007-03-23T02:39:06Z

It causes extra moon icons blinking on x60, and breaks at least two other systems. During resume, we do not know that "reboot"/"shutdown" method was used, so we assume "plaform" and call BIOS, anyway... This is 2.6.21 material, and should fix 2 or 3 regressions from 2.6.20. Signed-off-by: Pavel Machek Acked-by: "Rafael J. Wysocki" Cc: Adrian Bunk Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] swsusp: Fix SNAPSHOT_S2RAM ioctl

2007-03-23T02:39:05Z

The SNAPSHOT_S2RAM ioctl does not disable the nonboot CPUs before entering the suspend, although it should do this. Signed-off-by: Rafael J. Wysocki Acked-by: Pavel Machek Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] clockevents: Fix suspend/resume to disk hangs

2007-03-17T02:35:25Z

I finally found a dual core box, which survives suspend/resume without crashing in the middle of nowhere. Sigh, I never figured out from the code and the bug reports what's going on. The observed hangs are caused by a stale state transition of the clock event devices, which keeps the RCU synchronization away from completion, when the non boot CPU is brought back up. The suspend/resume in oneshot mode needs the similar care as the periodic mode during suspend to RAM. My assumption that the state transitions during the different shutdown/bringups of s2disk would go through the periodic boot phase and then switch over to highres resp. nohz mode were simply wrong. Add the appropriate suspend / resume handling for the non periodic modes. Signed-off-by: Thomas Gleixner Signed-off-by: Linus Torvalds

[PATCH] initialise pi_lock if CONFIG_RT_MUTEXES=N

2007-03-17T02:25:06Z

Fixes a bogus lockdep warning which causes lockdep to disable itself. Acked-by: Ingo Molnar Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] futex: PI state locking fix

2007-03-17T02:25:06Z

Testing of -rt by IBM uncovered a locking bug in wake_futex_pi(): the PI state needs to be locked before we access it. Signed-off-by: Ingo Molnar Acked-by: Thomas Gleixner Cc: Chuck Ebbert Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] swsusp: fix suspend when console is in VT_AUTO+KD_GRAPHICS mode

2007-03-17T02:25:05Z

When the console is in VT_AUTO+KD_GRAPHICS mode, switching to the SUSPEND_CONSOLE fails, resulting in vt_waitactive() waiting indefinitely or until the task is interrupted. This patch tests if a console switch can occur in set_console() and returns early if a console switch is not possible. [akpm@linux-foundation.org: cleanup] Signed-off-by: Andrew Johnson Acked-by: Pavel Machek Cc: "Antonino A. Daplas" Cc: "Rafael J. Wysocki" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds