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Ingo Molnar 86998aa653 [PATCH] genirq core: fix handle_level_irq() ... while porting the -rt tree to 2.6.18-rc7 i noticed the following screaming-IRQ scenario on an SMP system: 2274 0Dn.:1 0.001ms: do_IRQ+0xc/0x103 <= (ret_from_intr+0x0/0xf) 2274 0Dn.:1 0.010ms: do_IRQ+0xc/0x103 <= (ret_from_intr+0x0/0xf) 2274 0Dn.:1 0.020ms: do_IRQ+0xc/0x103 <= (ret_from_intr+0x0/0xf) 2274 0Dn.:1 0.029ms: do_IRQ+0xc/0x103 <= (ret_from_intr+0x0/0xf) 2274 0Dn.:1 0.039ms: do_IRQ+0xc/0x103 <= (ret_from_intr+0x0/0xf) 2274 0Dn.:1 0.048ms: do_IRQ+0xc/0x103 <= (ret_from_intr+0x0/0xf) 2274 0Dn.:1 0.058ms: do_IRQ+0xc/0x103 <= (ret_from_intr+0x0/0xf) 2274 0Dn.:1 0.068ms: do_IRQ+0xc/0x103 <= (ret_from_intr+0x0/0xf) 2274 0Dn.:1 0.077ms: do_IRQ+0xc/0x103 <= (ret_from_intr+0x0/0xf) 2274 0Dn.:1 0.087ms: do_IRQ+0xc/0x103 <= (ret_from_intr+0x0/0xf) 2274 0Dn.:1 0.097ms: do_IRQ+0xc/0x103 <= (ret_from_intr+0x0/0xf) as it turns out, the bug is caused by handle_level_irq(), which if it races with another CPU already handling this IRQ, it _unmasks_ the IRQ line on the way out. This is not how 2.6.17 works, and we introduced this bug in one of the early genirq cleanups right before it went into -mm. (the bug was not in the genirq patchset for a long time, and we didnt notice the bug due to the lack of -rt rebase to the new genirq code. -rt, and hardirq-preemption in particular opens up such races much wider than anything else.) Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>		19 years ago
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irq	[PATCH] genirq core: fix handle_level_irq()	19 years ago
power	[PATCH] prevent swsusp with PAE	19 years ago
time	…
.gitignore	…
Kconfig.hz	…
Kconfig.preempt	…
Makefile	…
acct.c	…
audit.c	[PATCH] sanity check audit_buffer	19 years ago
audit.h	[PATCH] audit: AUDIT_PERM support	19 years ago
auditfilter.c	[PATCH] audit: AUDIT_PERM support	19 years ago
auditsc.c	[PATCH] audit: AUDIT_PERM support	19 years ago
capability.c	…
compat.c	…
configs.c	…
cpu.c	…
cpuset.c	[PATCH] cpuset: oom panic fix	19 years ago
delayacct.c	[PATCH] task delay accounting fixes	19 years ago
dma.c	…
exec_domain.c	…
exit.c	[PATCH] eligible_child: remove an obsolete ->tgid check	19 years ago
extable.c	…
fork.c	[PATCH] task delay accounting fixes	19 years ago
futex.c	[PATCH] Use the correct restart option for futex_lock_pi	19 years ago
futex_compat.c	…
hrtimer.c	…
itimer.c	…
kallsyms.c	…
kexec.c	…
kfifo.c	…
kmod.c	[PATCH] bug fix in kernel/kmod.c	19 years ago
kprobes.c	…
ksysfs.c	…
kthread.c	…
lockdep.c	…
lockdep_internals.h	[PATCH] lockdep: double the number of stack-trace entries	19 years ago
lockdep_proc.c	…
module.c	…
mutex-debug.c	…
mutex-debug.h	…
mutex.c	…
mutex.h	…
panic.c	[PATCH] lockdep: do not touch console state when tainting the kernel	19 years ago
params.c	…
pid.c	…
posix-cpu-timers.c	…
posix-timers.c	…
printk.c	…
profile.c	…
ptrace.c	…
rcupdate.c	[PATCH] rcu_do_batch: make ->qlen decrement irq safe	19 years ago
rcutorture.c	…
relay.c	…
resource.c	…
rtmutex-debug.c	…
rtmutex-debug.h	…
rtmutex-tester.c	…
rtmutex.c	…
rtmutex.h	…
rtmutex_common.h	…
rwsem.c	…
sched.c	[PATCH] revert "Drop tasklist lock in do_sched_setscheduler"	19 years ago
seccomp.c	…
signal.c	…
softirq.c	…
softlockup.c	…
spinlock.c	[PATCH] lockdep ifdef fix	19 years ago
stacktrace.c	…
stop_machine.c	[PATCH] Remove redundant up() in stop_machine()	19 years ago
sys.c	…
sys_ni.c	…
sysctl.c	…
taskstats.c	…
time.c	…
timer.c	[PATCH] sys_getppid oopses on debug kernel	19 years ago
uid16.c	…
unwind.c	…
user.c	…
wait.c	…
workqueue.c	[PATCH] workqueue: remove lock_cpu_hotplug()	19 years ago