linux-kernel - [tip: perf/core] unwind: Clarify calling context

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Message-ID: <176173057579.2601451.4074565811440817092.tip-bot2@tip-bot2>
Date: Wed, 29 Oct 2025 09:36:15 -0000
From: "tip-bot2 for Peter Zijlstra" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: "Peter Zijlstra (Intel)" <peterz@...radead.org>,
 "Steven Rostedt (Google)" <rostedt@...dmis.org>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: perf/core] unwind: Clarify calling context

The following commit has been merged into the perf/core branch of tip:

Commit-ID:     1e74829f36b5db19afc3d17f0a3750e9573710ae
Gitweb:        https://git.kernel.org/tip/1e74829f36b5db19afc3d17f0a3750e9573710ae
Author:        Peter Zijlstra <peterz@...radead.org>
AuthorDate:    Mon, 22 Sep 2025 15:49:19 +02:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Wed, 29 Oct 2025 10:29:56 +01:00

unwind: Clarify calling context

The get_cookie() function hard relies on IRQs being disabled, but this
isn't immediately obvious when reading the function.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Acked-by: Steven Rostedt (Google) <rostedt@...dmis.org>
Link: https://patch.msgid.link/20250924080119.122507632@infradead.org
---
 kernel/unwind/deferred.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/unwind/deferred.c b/kernel/unwind/deferred.c
index d2cd3a7..6395192 100644
--- a/kernel/unwind/deferred.c
+++ b/kernel/unwind/deferred.c
@@ -79,6 +79,8 @@ static u64 get_cookie(struct unwind_task_info *info)
 {
 	u32 cnt = 1;
 
+	lockdep_assert_irqs_disabled();
+
 	if (info->id.cpu)
 		return info->id.id;