]> pilppa.com Git - linux-2.6-omap-h63xx.git/commitdiff
[PATCH] x86_64: Don't allow kprobes on __switch_to
authorAndi Kleen <ak@suse.de>
Fri, 3 Feb 2006 20:51:38 +0000 (21:51 +0100)
committerLinus Torvalds <torvalds@g5.osdl.org>
Sun, 5 Feb 2006 00:43:14 +0000 (16:43 -0800)
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>
arch/x86_64/kernel/process.c

index 8ded407e4a9419fd5bcd57dea91e5ef42ad0d41a..22a05dec81a224491b4a5bf859507e1fa7b11966 100644 (file)
@@ -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,