From nobody Mon Feb 9 17:56:19 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1A78926A09E; Fri, 2 May 2025 16:50:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746204611; cv=none; b=TSQxTLL604r2zC9TTqrnO5pUurPrM433x/0pR1bMX4Uq91huqOvbNTJ1ag8Q8c7oHvDe+Z4ZusJaD3axjPw5M9yP54xHppQuDqry3SjGK5LJZdriEuYFV493u9/OqoHHisKab+rdZeCmUegrAATEjG3c8fwV7lOLoXpC2mjNNA8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746204611; c=relaxed/simple; bh=kJ1lRlKcjudXfNQvt0hTUNRiwuzXdk/8XeV3RVZQ1LI=; h=Message-ID:Date:From:To:Cc:Subject:References:MIME-Version: Content-Type; b=C2Wl6O1QZOpg5rpY52tRUirYE8KD/3gI64W5yPGCmfTf+/xnzNI3SyBE/4lSFNE9W/PIRb0/kJFuhaIjnEptMT9CIX7fGcVbW4695qb0C+OPQgIfTk6tXWzSVd3GxLKsu+rvhZb+nxeD4UYXln3rSt5G3BEbf5+v+WDsJRFKp3c= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 Received: by smtp.kernel.org (Postfix) with ESMTPSA id 06329C4CEE9; Fri, 2 May 2025 16:50:11 +0000 (UTC) Received: from rostedt by gandalf with local (Exim 4.98.2) (envelope-from ) id 1uAtaU-0000000037m-1gOA; Fri, 02 May 2025 12:50:10 -0400 Message-ID: <20250502165010.249866358@goodmis.org> User-Agent: quilt/0.68 Date: Fri, 02 May 2025 12:48:03 -0400 From: Steven Rostedt To: linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Cc: Masami Hiramatsu , Mathieu Desnoyers , Josh Poimboeuf , Peter Zijlstra , x86@kernel.org, Jiri Olsa , Namhyung Kim Subject: [PATCH v7 17/17] perf: Skip user unwind if the task is a kernel thread. References: <20250502164746.178864972@goodmis.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Josh Poimboeuf If the task is not a user thread, there's no user stack to unwind. Signed-off-by: Josh Poimboeuf Signed-off-by: Steven Rostedt (Google) --- kernel/events/core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/events/core.c b/kernel/events/core.c index 7c7d5a27c568..02e52df7a02e 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -8101,7 +8101,8 @@ struct perf_callchain_entry * perf_callchain(struct perf_event *event, struct pt_regs *regs) { bool kernel =3D !event->attr.exclude_callchain_kernel; - bool user =3D !event->attr.exclude_callchain_user; + bool user =3D !event->attr.exclude_callchain_user && + !(current->flags & PF_KTHREAD); /* Disallow cross-task user callchains. */ bool crosstask =3D event->ctx->task && event->ctx->task !=3D current; const u32 max_stack =3D event->attr.sample_max_stack; --=20 2.47.2