Stephen Boyd 6135fc1eb4 sched: Fix __schedule_bug() output when called from an interrupt ... If schedule is called from an interrupt handler __schedule_bug() will call show_regs() with the registers saved during the interrupt handling done in do_IRQ(). This means we'll see the registers and the backtrace for the process that was interrupted and not the full backtrace explaining who called schedule(). This is due to 838225b ("sched: use show_regs() to improve __schedule_bug() output", 2007-10-24) which improperly assumed that get_irq_regs() would return the registers for the current stack because it is being called from within an interrupt handler. Simply remove the show_reg() code so that we dump a backtrace for the interrupt handler that called schedule(). [ I ran across this when I was presented with a scheduling while atomic log with a stacktrace pointing at spin_unlock_irqrestore(). It made no sense and I had to guess what interrupt handler could be called and poke around for someone calling schedule() in an interrupt handler. A simple test of putting an msleep() in an interrupt handler works better with this patch because you can actually see the msleep() call in the backtrace. ] Also-reported-by: Chris Metcalf <cmetcalf@tilera.com> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Cc: Satyam Sharma <satyam@infradead.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1332979847-27102-1-git-send-email-sboyd@codeaurora.org Signed-off-by: Ingo Molnar <mingo@kernel.org>		2012-03-29 08:34:45 +02:00
..
auto_group.c	sched: Clean up parameter passing of proc_sched_autogroup_set_nice()	2012-03-02 12:23:49 +01:00
auto_group.h
clock.c
core.c	sched: Fix __schedule_bug() output when called from an interrupt	2012-03-29 08:34:45 +02:00
cpupri.c	kernel-doc: fix kernel-doc warnings in sched	2012-01-23 08:44:54 -08:00
cpupri.h
debug.c	sched: Remove sched_switch	2012-01-27 13:28:53 +01:00
fair.c	sched: Fix compiler warning about declared inline after use	2012-03-23 10:39:28 +01:00
features.h	sched: Use jump_labels for sched_feat	2011-12-06 20:51:26 +01:00
idle_task.c
Makefile
rt.c	sched/rt: Improve pick_next_highest_task_rt()	2012-03-27 14:52:12 +02:00
sched.h	sched: Ditch per cgroup task lists for load-balancing	2012-03-01 13:08:37 +01:00
stats.c	sched: Remove sched_switch	2012-01-27 13:28:53 +01:00
stats.h	Merge branch 'sched/core' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into cputime-tip	2011-12-19 19:23:15 +01:00
stop_task.c