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[PATCH] i386: Fix softirq accounting with 4K stacks

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Copy the softirq bits in preempt_count from the current context into the
hardirq context when using 4K stacks to make the softirq_count macro work
correctly and thereby fix softirq cpu time accounting.

Signed-off-by: Björn Steinbrink <B.Steinbrink@gmx.de>
Acked-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Bjrn Steinbrink 2006-06-25 16:24:40 +02:00 committed by Linus Torvalds
parent 1d77062b14
commit a5d157e067
1 changed files with 8 additions and 0 deletions
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8
arch/i386/kernel/irq.c
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@ -95,6 +95,14 @@ fastcall unsigned int do_IRQ(struct pt_regs *regs)
irqctx->tinfo.task = curctx->tinfo.task;
irqctx->tinfo.previous_esp = current_stack_pointer;
/*
* Copy the softirq bits in preempt_count so that the
* softirq checks work in the hardirq context.
*/
irqctx->tinfo.preempt_count =
irqctx->tinfo.preempt_count & ~SOFTIRQ_MASK |
curctx->tinfo.preempt_count & SOFTIRQ_MASK;
asm volatile(
" xchgl %%ebx,%%esp \n"
" call __do_IRQ \n"