[PATCH v4 34/39] perf: Skip user unwind if !current->mm
Josh Poimboeuf <[email protected]>
| Newsgroups | org.kernel.vger.linux-toolchains,org.kernel.vger.linux-kernel,org.kernel.vger.linux-perf-users,org.kernel.vger.linux-trace-kernel |
|---|---|
| Message-ID | <24cde1381495cd637f0d5663ab7629572bc0eca6.1737511963.git.jpoimboe@kernel.org> |
If the task doesn't have any memory, there's no stack to unwind. Signed-off-by: Josh Poimboeuf <[email protected]> --- kernel/events/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/events/core.c b/kernel/events/core.c index 99f0f28feeb5..a886bb83f4d0 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -7792,7 +7792,7 @@ struct perf_callchain_entry * perf_callchain(struct perf_event *event, struct pt_regs *regs) { bool kernel = !event->attr.exclude_callchain_kernel; - bool user = !event->attr.exclude_callchain_user; + bool user = !event->attr.exclude_callchain_user && current->mm; const u32 max_stack = event->attr.sample_max_stack; struct perf_callchain_entry *callchain; -- 2.48.1