Commit-ID: 3539d09154e11336c31a900a9cd49e386ba6d9b2
Gitweb: https://git.kernel.org/tip/3539d09154e11336c31a900a9cd49e386ba6d9b2
Author: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
AuthorDate: Tue, 19 Sep 2017 18:59:00 +0900
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Thu, 28 Sep 2017 09:23:03 +0200
kprobes: Improve smoke test to check preemptibility
Add preemptible check to each handler. Handlers are called with
non-preemtible, which is guaranteed by Documentation/kprobes.txt.
Signed-off-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Cc: Alexei Starovoitov <ast@xxxxxx>
Cc: Alexei Starovoitov <ast@xxxxxxxxxx>
Cc: Ananth N Mavinakayanahalli <ananth@xxxxxxxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Paul E . McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/150581513991.32348.7956810394499654272.stgit@devbox
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
kernel/test_kprobes.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/kernel/test_kprobes.c b/kernel/test_kprobes.c
index 0dbab6d..47106a1 100644
--- a/kernel/test_kprobes.c
+++ b/kernel/test_kprobes.c
@@ -34,6 +34,10 @@ static noinline u32 kprobe_target(u32 value)
static int kp_pre_handler(struct kprobe *p, struct pt_regs *regs)
{
+ if (preemptible()) {
+ handler_errors++;
+ pr_err("pre-handler is preemptible\n");
+ }
preh_val = (rand1 / div_factor);
return 0;
}
@@ -41,6 +45,10 @@ static int kp_pre_handler(struct kprobe *p, struct pt_regs *regs)
static void kp_post_handler(struct kprobe *p, struct pt_regs *regs,
unsigned long flags)
{
+ if (preemptible()) {
+ handler_errors++;
+ pr_err("post-handler is preemptible\n");
+ }
if (preh_val != (rand1 / div_factor)) {
handler_errors++;
pr_err("incorrect value in post_handler\n");
@@ -156,6 +164,10 @@ static int test_kprobes(void)
static u32 j_kprobe_target(u32 value)
{
+ if (preemptible()) {
+ handler_errors++;
+ pr_err("jprobe-handler is preemptible\n");
+ }
if (value != rand1) {
handler_errors++;
pr_err("incorrect value in jprobe handler\n");
@@ -232,6 +244,10 @@ static u32 krph_val;
static int entry_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
{
+ if (preemptible()) {
+ handler_errors++;
+ pr_err("kretprobe entry handler is preemptible\n");
+ }
krph_val = (rand1 / div_factor);
return 0;
}
@@ -240,6 +256,10 @@ static int return_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
{
unsigned long ret = regs_return_value(regs);
+ if (preemptible()) {
+ handler_errors++;
+ pr_err("kretprobe return handler is preemptible\n");
+ }
if (ret != (rand1 / div_factor)) {
handler_errors++;
pr_err("incorrect value in kretprobe handler\n");
--
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