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| author | Andi Kleen <ak@suse.de> | 2006-02-03 21:51:38 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-02-04 16:43:14 -0800 |
| commit | 099f318b8d97490e58c595eb1b6d3415da5ccc03 (patch) | |
| tree | 48a621571d97cf72b0ade93033ef6d68d2b676b8 | |
| parent | 16acc0cd8f1aac63ddf5228c5bc29cf7d31627f4 (diff) | |
| download | blackbird-op-linux-099f318b8d97490e58c595eb1b6d3415da5ccc03.tar.gz blackbird-op-linux-099f318b8d97490e58c595eb1b6d3415da5ccc03.zip | |
[PATCH] x86_64: Don't allow kprobes on __switch_to
kprobes cannot deal with the funny calling conventions when it
runs on a different stack when it returns. If someone wants
to instrument context switch they can add a probe to schedule()
instead.
Cc: jkenisto@us.ibm.com, prasanna@in.ibm.com
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| -rw-r--r-- | arch/x86_64/kernel/process.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/x86_64/kernel/process.c b/arch/x86_64/kernel/process.c index 8ded407e4a94..22a05dec81a2 100644 --- a/arch/x86_64/kernel/process.c +++ b/arch/x86_64/kernel/process.c @@ -516,8 +516,10 @@ out: * This could still be optimized: * - fold all the options into a flag word and test it with a single test. * - could test fs/gs bitsliced + * + * Kprobes not supported here. Set the probe on schedule instead. */ -struct task_struct * +__kprobes struct task_struct * __switch_to(struct task_struct *prev_p, struct task_struct *next_p) { struct thread_struct *prev = &prev_p->thread, |
