kernel_optimize_test/kernel/irq
Ingo Molnar e58aa3d2d0 genirq: Run irq handlers with interrupts disabled
Running interrupt handlers with interrupts enabled can cause stack
overflows. That has been observed with multiqueue NICs delivering all
their interrupts to a single core. We might band aid that somehow by
checking the interrupt stacks, but the real safe fix is to run the irq
handlers with interrupts disabled.

Drivers for whacky hardware still can reenable them in the handler
itself, if the need arises. (They do already due to lockdep)

The risk of doing this is rather low:

 - lockdep already enforces this
 - CONFIG_NOHZ has shaken out the drivers which relied on jiffies updates
 - time keeping is not longer sensitive to the timer interrupt being delayed

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Miller <davem@davemloft.net>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Linus Torvalds <torvalds@osdl.org>
LKML-Reference: <20100326000405.758579387@linutronix.de>
2010-04-13 16:36:40 +02:00
..
autoprobe.c genirq: Convert irq_desc.lock to raw_spinlock 2009-12-14 23:55:33 +01:00
chip.c Merge branch 'irq-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2010-03-26 15:09:06 -07:00
devres.c devres/irq: Fix devm_irq_match comment 2010-02-11 16:01:02 +01:00
handle.c genirq: Run irq handlers with interrupts disabled 2010-04-13 16:36:40 +02:00
internals.h sparseirq: Change irq_desc_ptrs to static 2010-02-17 17:27:03 -08:00
Makefile x86/irq: use move_irq_desc() in create_irq_nr() 2009-05-01 19:01:12 +02:00
manage.c genirq: Introduce request_any_context_irq() 2010-04-13 16:36:39 +02:00
migration.c genirq: Convert irq_desc.lock to raw_spinlock 2009-12-14 23:55:33 +01:00
numa_migrate.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
pm.c genirq: Convert irq_desc.lock to raw_spinlock 2009-12-14 23:55:33 +01:00
proc.c Merge branch 'linus' into irq/core 2010-04-13 14:12:17 +02:00
resend.c irq: Remove superfluous NULL pointer check in check_irq_resend() 2009-08-09 12:44:29 +02:00
spurious.c genirq: Convert irq_desc.lock to raw_spinlock 2009-12-14 23:55:33 +01:00