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Message-ID: <c452e41ed3d14c86aa0e05b4936c670b@AcuMS.aculab.com>
Date: Fri, 28 Jun 2024 15:03:58 +0000
From: David Laight <David.Laight@...LAB.COM>
To: 'Alexey Dobriyan' <adobriyan@...il.com>, Marco Elver <elver@...gle.com>
CC: Thomas Gleixner <tglx@...utronix.de>, "linux-kernel@...r.kernel.org"
<linux-kernel@...r.kernel.org>, "akpm@...ux-foundation.org"
<akpm@...ux-foundation.org>
Subject: RE: [PATCH v2] compiler.h: simplify data_race() macro
From: Alexey Dobriyan
> Sent: 24 June 2024 16:40
>
> -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.
>
> Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
> ---
>
> include/linux/compiler.h | 6 ++----
> 1 file changed, 2 insertions(+), 4 deletions(-)
>
> --- a/include/linux/compiler.h
> +++ b/include/linux/compiler.h
> @@ -200,10 +200,8 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
> */
> #define data_race(expr) \
> ({ \
> - __unqual_scalar_typeof(({ expr; })) __v = ({ \
> - __kcsan_disable_current(); \
> - expr; \
> - }); \
> + __kcsan_disable_current(); \
> + __auto_type __v = (expr); \
> __kcsan_enable_current(); \
> __v; \
> })
I think you can remove a lot of the tabs...
David
-
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