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authorAndi Kleen <ak@suse.de>2006-02-03 21:51:38 +0100
committerLinus Torvalds <torvalds@g5.osdl.org>2006-02-04 16:43:14 -0800
commit099f318b8d97490e58c595eb1b6d3415da5ccc03 (patch)
tree48a621571d97cf72b0ade93033ef6d68d2b676b8 /arch/x86_64/kernel/process.c
parent16acc0cd8f1aac63ddf5228c5bc29cf7d31627f4 (diff)
downloadop-kernel-dev-099f318b8d97490e58c595eb1b6d3415da5ccc03.zip
op-kernel-dev-099f318b8d97490e58c595eb1b6d3415da5ccc03.tar.gz
[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>
Diffstat (limited to 'arch/x86_64/kernel/process.c')
-rw-r--r--arch/x86_64/kernel/process.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/x86_64/kernel/process.c b/arch/x86_64/kernel/process.c
index 8ded407..22a05de 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,
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