Commit 099f318b authored Feb 03, 2006 by Andi Kleen Committed by Linus Torvalds Feb 04, 2006

[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>

parent 16acc0cd

arch/x86_64/kernel/process.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -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,