[tip: locking/core] checkpatch: Warn about context_unsafe() without comment

[tip-bot2 for Marco Elver]

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

Commit-ID:     25d3b21e1d41f7b58aeb62b97b05d86d43c91801
Gitweb:        https://git.kernel.org/tip/25d3b21e1d41f7b58aeb62b97b05d86d43c91801
Author:        Marco Elver <elver@xxxxxxxxxx>
AuthorDate:    Fri, 19 Dec 2025 16:39:54 +01:00
Committer:     Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Mon, 05 Jan 2026 16:43:27 +01:00

checkpatch: Warn about context_unsafe() without comment

Warn about applications of context_unsafe() without a comment, to
encourage documenting the reasoning behind why it was deemed safe.

Signed-off-by: Marco Elver <elver@xxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Link: https://patch.msgid.link/20251219154418.3592607-6-elver@xxxxxxxxxx
---
 scripts/checkpatch.pl | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index c025024..c4fd8bd 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -6733,6 +6733,13 @@ sub process {
 			}
 		}
 
+# check for context_unsafe without a comment.
+		if ($line =~ /\bcontext_unsafe\b/ &&
+		    !ctx_has_comment($first_line, $linenr)) {
+			WARN("CONTEXT_UNSAFE",
+			     "context_unsafe without comment\n" . $herecurr);
+		}
+
 # check of hardware specific defines
 		if ($line =~ m@^.\s*\#\s*if.*\b(__i386__|__powerpc64__|__sun__|__s390x__)\b@ && $realfile !~ m@include/asm-@) {
 			CHK("ARCH_DEFINES",