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| author | Andi Kleen <ak@suse.de> | 2005-04-16 15:25:13 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:25:13 -0700 |
| commit | daeeafecf029a05a304fa299706b3ecc90e16175 (patch) | |
| tree | 7b17fd7408b47892e391604c6791674f03109e1c /include/asm-x86_64/kdebug.h | |
| parent | ece90303ec7e2e8d8610eb03ee7648755dd8efe7 (diff) | |
| download | op-kernel-dev-daeeafecf029a05a304fa299706b3ecc90e16175.zip op-kernel-dev-daeeafecf029a05a304fa299706b3ecc90e16175.tar.gz | |
[PATCH] x86_64: Keep only a single debug notifier chain
Calling a notifier three times in the debug handler does not make much sense,
because a debugger can figure out the various conditions by itself. Remove
the additional calls to DIE_DEBUG and DIE_DEBUGSTEP completely.
This matches what i386 does now.
This also makes sure interrupts are always still disabled when calling a
debugger, which prevents:
BUG: using smp_processor_id() in preemptible [00000001] code: tpopf/1470
caller is post_kprobe_handler+0x9/0x70
Call Trace:<ffffffff8024f10f>{smp_processor_id+191} <ffffffff80120e69>{post_kpro
be_handler+9}
<ffffffff80120f7a>{kprobe_exceptions_notify+58}
<ffffffff80144fc0>{notifier_call_chain+32} <ffffffff80110daf>{do_debug+335}
<ffffffff8010f513>{debug+127} <EOE>
on preemptible debug kernels with kprobes when single stepping in user space.
This was probably a bug even on non preempt kernels, this function was
supposed to be running with interrupts off according to a comment there.
Note to third part debugger maintainers: please double check your debugger can
still single step.
Cc: <prasanna@in.ibm.com>
Cc: <jbeulich@novell.com>
Cc: <kaos@sgi.com>
Cc: <jim.houston@ccur.com>
Cc: <jfv@bluesong.net>
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 'include/asm-x86_64/kdebug.h')
| -rw-r--r-- | include/asm-x86_64/kdebug.h | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/include/asm-x86_64/kdebug.h b/include/asm-x86_64/kdebug.h index adb6f91..6277f75 100644 --- a/include/asm-x86_64/kdebug.h +++ b/include/asm-x86_64/kdebug.h @@ -23,7 +23,6 @@ enum die_val { DIE_OOPS = 1, DIE_INT3, DIE_DEBUG, - DIE_DEBUGSTEP, DIE_PANIC, DIE_NMI, DIE_DIE, |
