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authorBjörn Steinbrink <B.Steinbrink@gmx.de>2006-06-25 16:24:40 +0200
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-25 11:32:44 -0700
commita5d157e0675ac11188a8d429a062b1938bb2d353 (patch)
tree152d75b3ecda85427a92808ec363bc4d1c9bd243 /arch
parent1d77062b1402aef5b26e1d3776991126e8026bde (diff)
downloadop-kernel-dev-a5d157e0675ac11188a8d429a062b1938bb2d353.zip
op-kernel-dev-a5d157e0675ac11188a8d429a062b1938bb2d353.tar.gz
[PATCH] i386: Fix softirq accounting with 4K stacks
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/i386/kernel/irq.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/i386/kernel/irq.c b/arch/i386/kernel/irq.c
index 248e922..49ce4c3 100644
--- a/arch/i386/kernel/irq.c
+++ b/arch/i386/kernel/irq.c
@@ -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"
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