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| author | Steven Rostedt <srostedt@redhat.com> | 2012-05-30 11:43:19 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-06-10 00:36:12 +0900 |
| commit | d961b4e3f741d32fb5fe96fe1123c96a3025a1db (patch) | |
| tree | 23f46745b710d5654bf11660b6719b8cea4861f2 | |
| parent | cdd5479bf6cfbaf84308beda5b76037dbea471b1 (diff) | |
| download | linux-3.10-d961b4e3f741d32fb5fe96fe1123c96a3025a1db.tar.gz linux-3.10-d961b4e3f741d32fb5fe96fe1123c96a3025a1db.tar.bz2 linux-3.10-d961b4e3f741d32fb5fe96fe1123c96a3025a1db.zip | |
x86: Reset the debug_stack update counter
commit c0525a6972d3f1fb83058ef503e183475d6e4e26 upstream.
When an NMI goes off and it sees that it preempted the debug stack,
to keep the debug stack safe, it changes the IDT to point to one that
does not modify the stack on breakpoint (to allow breakpoints in NMIs).
But the variable that gets set to know to undo it on exit never gets
cleared on exit. Thus every NMI will reset it on exit the first time
it is done even if it does not need to be reset.
[ Added H. Peter Anvin's suggestion to use this_cpu_read/write ]
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | arch/x86/kernel/nmi.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/x86/kernel/nmi.c b/arch/x86/kernel/nmi.c index 47acaf31916..32856fa4384 100644 --- a/arch/x86/kernel/nmi.c +++ b/arch/x86/kernel/nmi.c @@ -491,14 +491,16 @@ static inline void nmi_nesting_preprocess(struct pt_regs *regs) */ if (unlikely(is_debug_stack(regs->sp))) { debug_stack_set_zero(); - __get_cpu_var(update_debug_stack) = 1; + this_cpu_write(update_debug_stack, 1); } } static inline void nmi_nesting_postprocess(void) { - if (unlikely(__get_cpu_var(update_debug_stack))) + if (unlikely(this_cpu_read(update_debug_stack))) { debug_stack_reset(); + this_cpu_write(update_debug_stack, 0); + } } #endif |