The patch titled
Subject: compiler.h: simplify data_race() macro
has been added to the -mm mm-nonmm-unstable branch. Its filename is
compilerh-simplify-data_race-macro.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/compilerh-simplify-data_race-macro.patch
This patch will later appear in the mm-nonmm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Subject: compiler.h: simplify data_race() macro
Date: Mon, 24 Jun 2024 18:39:49 +0300
-Wdeclaration-after-statement used since forever required statement
expressions to inject __kcsan_disable_current(), __kcsan_enable_current()
to mark data race. Now that it is gone, make macro expansion simpler.
__unqual_scalar_typeof() is wordy macro by itself.
"expr" is expanded twice.
Link: https://lkml.kernel.org/r/fb62163f-ba21-4661-be5b-bb5124abc87d@p183
Signed-off-by: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Reviewed-by: Marco Elver <elver@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/compiler.h | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
--- a/include/linux/compiler.h~compilerh-simplify-data_race-macro
+++ a/include/linux/compiler.h
@@ -200,10 +200,8 @@ void ftrace_likely_update(struct ftrace_
*/
#define data_race(expr) \
({ \
- __unqual_scalar_typeof(({ expr; })) __v = ({ \
- __kcsan_disable_current(); \
- expr; \
- }); \
+ __kcsan_disable_current(); \
+ __auto_type __v = (expr); \
__kcsan_enable_current(); \
__v; \
})
_
Patches currently in -mm which might be from adobriyan@xxxxxxxxx are
proc-test-kthread-field.patch
build-id-require-program-headers-to-be-right-after-elf-header.patch
compilerh-simplify-data_race-macro.patch
