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authorMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>2010-10-14 12:10:18 +0900
committerIngo Molnar <mingo@elte.hu>2010-10-14 08:55:27 +0200
commit0f55a2f3d496133dd22f1e4e49fb7301da87c7bb (patch)
tree7196edf98b6e129fbb828460b683d9a0b3810960 /Documentation/kprobes.txt
parent1efeb08d7dd32c0fbd4b784ea9303b53d345bfd0 (diff)
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kprobes: Update document about irq disabled state in kprobe handler
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: Rusty Russell <rusty@rustcorp.com.au> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: 2nddept-manager@sdl.hitachi.co.jp LKML-Reference: <20101014031018.4100.64883.stgit@ltc236.sdl.hitachi.co.jp> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'Documentation/kprobes.txt')
-rw-r--r--Documentation/kprobes.txt8
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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