Messages in this thread Patch in this message | | | From | Masami Hiramatsu <> | Subject | [PATCH -tip 1/5] [RESEND] kprobes: Update document about irq disabled state in kprobe handler | Date | Thu, 14 Oct 2010 12:10:18 +0900 |
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Update kprobes.txt about interrupts disabled state inside kprobes handlers, because optimized probe/boosted kretprobe run without disabling interrrupts on x86.
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: linux-kernel@vger.kernel.org Cc: linux-doc@vger.kernel.org ---
Documentation/kprobes.txt | 8 +++++--- 1 files changed, 5 insertions(+), 3 deletions(-)
diff --git a/Documentation/kprobes.txt b/Documentation/kprobes.txt index 1762b81..741fe66 100644 --- a/Documentation/kprobes.txt +++ b/Documentation/kprobes.txt @@ -542,9 +542,11 @@ Kprobes does not use mutexes or allocate memory except during registration and unregistration. Probe handlers are run with preemption disabled. Depending on the -architecture, handlers may also run with interrupts disabled. In any -case, your handler should not yield the CPU (e.g., by attempting to -acquire a semaphore). +architecture and optimization state, handlers may also run with +interrupts disabled (e.g., kretprobe handlers and optimized kprobe +handlers run without interrupt disabled on x86/x86-64). In any case, +your handler should not yield the CPU (e.g., by attempting to acquire +a semaphore). Since a return probe is implemented by replacing the return address with the trampoline's address, stack backtraces and calls
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