diff options
author | Corey Minyard <minyard@acm.org> | 2006-05-08 15:17:25 +0200 |
---|---|---|
committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-05-08 09:34:56 -0700 |
commit | 8b1ffe9550e71224c43d8c754245bd76f4ea9bb8 (patch) | |
tree | f569da4b1dabc94867ff2a7a0d383bef0d4f49bf /include/asm-x86_64/mach_apic.h | |
parent | cdc60a4c8e71c4bcf67e83fac6c0cabd0ff19bfe (diff) |
[PATCH] x86_64: add nmi_exit to die_nmi
Playing with NMI watchdog on x86_64, I discovered that it didn't
do what I expected. It always panic-ed, even when it didn't
happen from interrupt context. This patch solves that
problem for me. Also, in this case, do_exit() will be called
with interrupts disabled, I believe. Would it be wise to also
call local_irq_enable() after nmi_exit()?
[Yes I added it -AK]
Currently, on x86_64, any NMI watchdog timeout will cause a panic
because the irq count will always be set to be in an interrupt
when do_exit() is called from die_nmi(). If we add nmi_exit() to
the die_nmi() call (since the nmi will never exit "normally")
it seems to solve this problem. The following small program
can be used to trigger the NMI watchdog to reproduce this:
main ()
{
iopl(3);
for (;;) asm("cli");
}
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-x86_64/mach_apic.h')
0 files changed, 0 insertions, 0 deletions