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irq: Improve a bit softirq debugging 

do_softirq() has a debug check that verifies that it is not nesting
on softirqs processing, nor miscounting the softirq part of the preempt
count.

But making sure that softirqs processing don't nest is actually a more
generic concern that applies to any caller of __do_softirq().

Do take it one step further and generalize that debug check to
any softirq processing.

Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@au1.ibm.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul Mackerras <paulus@au1.ibm.com>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: James E.J. Bottomley <jejb@parisc-linux.org>
Cc: Helge Deller <deller@gmx.de>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Frederic Weisbecker 2013-09-24 04:11:35 +02:00
parent be6e101644
commit 5d60d3e7c0
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
kernel/softirq.c
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@ -133,7 +133,6 @@ EXPORT_SYMBOL(local_bh_disable);
static void __local_bh_enable(unsigned int cnt) static void __local_bh_enable(unsigned int cnt)
{ {
WARN_ON_ONCE(in_irq());
WARN_ON_ONCE(!irqs_disabled()); WARN_ON_ONCE(!irqs_disabled());
if (softirq_count() == cnt) if (softirq_count() == cnt)
@ -148,6 +147,7 @@ static void __local_bh_enable(unsigned int cnt)
*/ */
void _local_bh_enable(void) void _local_bh_enable(void)
{ {
WARN_ON_ONCE(in_irq());
__local_bh_enable(SOFTIRQ_DISABLE_OFFSET); __local_bh_enable(SOFTIRQ_DISABLE_OFFSET);
} }
@ -279,6 +279,7 @@ restart:
account_irq_exit_time(current); account_irq_exit_time(current);
__local_bh_enable(SOFTIRQ_OFFSET); __local_bh_enable(SOFTIRQ_OFFSET);
WARN_ON_ONCE(in_interrupt());
tsk_restore_flags(current, old_flags, PF_MEMALLOC); tsk_restore_flags(current, old_flags, PF_MEMALLOC);
} }
@ -299,7 +300,6 @@ asmlinkage void do_softirq(void)
if (pending) if (pending)
do_softirq_own_stack(); do_softirq_own_stack();
WARN_ON_ONCE(softirq_count());
local_irq_restore(flags); local_irq_restore(flags);
} }