diff options
| -rw-r--r-- | arch/s390/kernel/kprobes.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/s390/kernel/kprobes.c b/arch/s390/kernel/kprobes.c index 250f5972536a..dd6306c51bd6 100644 --- a/arch/s390/kernel/kprobes.c +++ b/arch/s390/kernel/kprobes.c @@ -690,6 +690,15 @@ int setjmp_pre_handler(struct kprobe *p, struct pt_regs *regs) stack = (unsigned long) regs->gprs[15]; memcpy(kcb->jprobes_stack, (void *) stack, MIN_STACK_SIZE(stack)); + + /* + * jprobes use jprobe_return() which skips the normal return + * path of the function, and this messes up the accounting of the + * function graph tracer to get messed up. + * + * Pause function graph tracing while performing the jprobe function. + */ + pause_graph_tracing(); return 1; } NOKPROBE_SYMBOL(setjmp_pre_handler); @@ -705,6 +714,9 @@ int longjmp_break_handler(struct kprobe *p, struct pt_regs *regs) struct kprobe_ctlblk *kcb = get_kprobe_ctlblk(); unsigned long stack; + /* It's OK to start function graph tracing again */ + unpause_graph_tracing(); + stack = (unsigned long) kcb->jprobe_saved_regs.gprs[15]; /* Put the regs back */ |