[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: [email protected], [email protected] Signed-off-by: Andi Kleen <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
mna · Feb 5, 2006 · 099f318 · 099f318
1 parent 16acc0c
commit 099f318
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/arch/x86_64/kernel/process.c b/arch/x86_64/kernel/process.c
@@ -516,8 +516,10 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long rsp,
  * 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,