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authorAndi Kleen <ak@suse.de>2005-07-29 00:15:49 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2005-07-29 00:46:02 -0400
commited6b676ca8b50e0b538e61c283d52fd04f007abf (patch)
tree753ea613ce334c41f835f6aac21074b137d24713 /arch/x86_64/kernel/irq.c
parent3829ee6b1be03d5aa3005fe7d19f30088b539836 (diff)
[PATCH] x86_64: Switch to the interrupt stack when running a softirq in local_bh_enable()
This avoids some potential stack overflows with very deep softirq callchains. i386 does this too. TOADD CFI annotation Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/x86_64/kernel/irq.c')
-rw-r--r--arch/x86_64/kernel/irq.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/x86_64/kernel/irq.c b/arch/x86_64/kernel/irq.c
index cc3fb85f5145..849a20aec7ca 100644
--- a/arch/x86_64/kernel/irq.c
+++ b/arch/x86_64/kernel/irq.c
@@ -135,3 +135,22 @@ void fixup_irqs(cpumask_t map)
135 local_irq_disable(); 135 local_irq_disable();
136} 136}
137#endif 137#endif
138
139extern void call_softirq(void);
140
141asmlinkage void do_softirq(void)
142{
143 __u32 pending;
144 unsigned long flags;
145
146 if (in_interrupt())
147 return;
148
149 local_irq_save(flags);
150 pending = local_softirq_pending();
151 /* Switch to interrupt stack */
152 if (pending)
153 call_softirq();
154 local_irq_restore(flags);
155}
156EXPORT_SYMBOL(do_softirq);