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| author | jia zhang <jia.zhang2008@gmail.com> | 2008-11-23 04:51:41 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-11-23 10:57:42 +0300 |
| commit | 3aeb95d5b7839708a8d8e11aa274ee4d0d4042cc (patch) | |
| tree | d9bdb97ddbcb914f019cd6db2a5f035f34a3fb4c /arch/x86/kernel/irq_64.c | |
| parent | ca9eed76133c00e7f4b1eeb4c1a6cb800cd2654c (diff) | |
| download | linux-3aeb95d5b7839708a8d8e11aa274ee4d0d4042cc.tar.xz | |
x86_64: fix the check in stack_overflow_check
Impact: make stack overflow debug check and printout narrower
stack_overflow_check() should consider the stack usage of pt_regs, and
thus it could warn us in advance. Additionally, it looks better for
the warning time to start at INITIAL_JIFFIES.
Assuming that rsp gets close to the check point before interrupt
arrives: when interrupt really happens, thread_info will be partly
overrode.
Signed-off-by: jia zhang <jia.zhang2008@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/irq_64.c')
| -rw-r--r-- | arch/x86/kernel/irq_64.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/arch/x86/kernel/irq_64.c b/arch/x86/kernel/irq_64.c index 60eb84eb77a0..b842fc82be15 100644 --- a/arch/x86/kernel/irq_64.c +++ b/arch/x86/kernel/irq_64.c @@ -29,11 +29,12 @@ static inline void stack_overflow_check(struct pt_regs *regs) { u64 curbase = (u64)task_stack_page(current); - static unsigned long warned = -60*HZ; + static unsigned long warned = INITIAL_JIFFIES - 60*HZ; if (regs->sp >= curbase && regs->sp <= curbase + THREAD_SIZE && - regs->sp < curbase + sizeof(struct thread_info) + 128 && - time_after(jiffies, warned + 60*HZ)) { + regs->sp < curbase + sizeof(struct thread_info) + + sizeof(struct pt_regs) + 128 && + time_after(jiffies, warned + 60*HZ)) { printk("do_IRQ: %s near stack overflow (cur:%Lx,sp:%lx)\n", current->comm, curbase, regs->sp); show_stack(NULL,NULL); |