The quilt patch titled
Subject: scripts/Makefile.extrawarn: do not show clang's non-kprintf warnings at W=1
has been removed from the -mm tree. Its filename was
scripts-makefileextrawarn-do-not-show-clangs-non-kprintf-warnings-at-w=1.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Nathan Chancellor <nathan@xxxxxxxxxx>
Subject: scripts/Makefile.extrawarn: do not show clang's non-kprintf warnings at W=1
Date: Fri, 31 Jan 2025 15:55:28 -0700
Clang's -Wformat-overflow and -Wformat-truncation have chosen to check
'%p' unlike GCC but it does not know about the kernel's pointer extensions
in lib/vsprintf.c, so the developers split that part of the warning out
for the kernel to disable because there will always be false positives.
Commit 908dd508276d ("kbuild: enable -Wformat-truncation on clang") did
disabled these warnings but only in a block that would be called when W=1
was not passed, so they would appear with W=1. Move the disabling of the
non-kprintf warnings to a block that always runs so that they are never
seen, regardless of warning level.
Link: https://lkml.kernel.org/r/20250131-makefile-extrawarn-fix-clang-format-non-kprintf-v1-1-6c6747ada0d4@xxxxxxxxxx
Fixes: 908dd508276d ("kbuild: enable -Wformat-truncation on clang")
Signed-off-by: Nathan Chancellor <nathan@xxxxxxxxxx>
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Closes: https://lore.kernel.org/oe-kbuild-all/202501291646.VtwF98qd-lkp@xxxxxxxxx/
Cc: Andriy Shevchenko <andy.shevchenko@xxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Masahiro Yamada <masahiroy@xxxxxxxxxx>
Cc: Nicolas Schier <nicolas@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
scripts/Makefile.extrawarn | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
--- a/scripts/Makefile.extrawarn~scripts-makefileextrawarn-do-not-show-clangs-non-kprintf-warnings-at-w=1
+++ a/scripts/Makefile.extrawarn
@@ -31,6 +31,11 @@ KBUILD_CFLAGS-$(CONFIG_CC_NO_ARRAY_BOUND
ifdef CONFIG_CC_IS_CLANG
# The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable.
KBUILD_CFLAGS += -Wno-gnu
+
+# Clang checks for overflow/truncation with '%p', while GCC does not:
+# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111219
+KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow-non-kprintf)
+KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation-non-kprintf)
else
# gcc inanely warns about local variables called 'main'
@@ -102,11 +107,6 @@ KBUILD_CFLAGS += $(call cc-disable-warni
KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
ifdef CONFIG_CC_IS_GCC
KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
-else
-# Clang checks for overflow/truncation with '%p', while GCC does not:
-# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111219
-KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow-non-kprintf)
-KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation-non-kprintf)
endif
KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
_
Patches currently in -mm which might be from nathan@xxxxxxxxxx are
