diff options
| author | Josh Poimboeuf <jpoimboe@kernel.org> | 2025-08-20 14:03:43 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-11-02 22:18:03 +0900 |
| commit | 02b3654ea8bdced4a05025a5928db9ad230aec45 (patch) | |
| tree | d21fd5f3ddf8f815b88c59e47e68da3ae7ad1624 | |
| parent | 10f41e2a8f501a97d00732261edbf3f5f638e33b (diff) | |
| download | linux-02b3654ea8bdced4a05025a5928db9ad230aec45.tar.gz linux-02b3654ea8bdced4a05025a5928db9ad230aec45.tar.bz2 linux-02b3654ea8bdced4a05025a5928db9ad230aec45.zip | |
perf: Skip user unwind if the task is a kernel thread
[ Upstream commit 16ed389227651330879e17bd83d43bd234006722 ]
If the task is not a user thread, there's no user stack to unwind.
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250820180428.930791978@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | kernel/events/core.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c index a3dc79ec6f87..c0e938d28758 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -8192,7 +8192,8 @@ 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->flags & (PF_KTHREAD | PF_USER_WORKER)); /* Disallow cross-task user callchains. */ bool crosstask = event->ctx->task && event->ctx->task != current; const u32 max_stack = event->attr.sample_max_stack; |