linux-kernel - Re: [PATCH 2/3] sched: add a macro to define bitops for task atomic flags

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Date:	Mon, 22 Sep 2014 13:45:39 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Zefan Li <lizefan@...wei.com>
Cc:	Tejun Heo <tj@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
	Cgroups <cgroups@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>, keescook@...omium.org,
	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Subject: Re: [PATCH 2/3] sched: add a macro to define bitops for task atomic
 flags

On Mon, Sep 22, 2014 at 11:51:48AM +0800, Zefan Li wrote:
> This will simplify code when we add new flags.
> 
> Signed-off-by: Zefan Li <lizefan@...wei.com>
> ---
>  include/linux/sched.h | 20 +++++++++++---------
>  1 file changed, 11 insertions(+), 9 deletions(-)
> 
> diff --git a/include/linux/sched.h b/include/linux/sched.h
> index 4557765..04a2ae2 100644
> --- a/include/linux/sched.h
> +++ b/include/linux/sched.h
> @@ -1959,15 +1959,17 @@ static inline void memalloc_noio_restore(unsigned int flags)
>  /* Per-process atomic flags. */
>  #define PFA_NO_NEW_PRIVS 0	/* May not gain new privileges. */
>  
> -static inline bool task_no_new_privs(struct task_struct *p)
> -{
> -	return test_bit(PFA_NO_NEW_PRIVS, &p->atomic_flags);
> -}
> -
> -static inline void task_set_no_new_privs(struct task_struct *p)
> -{
> -	set_bit(PFA_NO_NEW_PRIVS, &p->atomic_flags);
> -}
> +#define TASK_PFA_BITOPS(name, func)				\
> +static inline bool task_##func(struct task_struct *p)		\
> +{ return test_bit(PFA_##name, &p->atomic_flags); }		\
> +								\
> +static inline void task_set_##func(struct task_struct *p)	\
> +{ set_bit(PFA_##name, &p->atomic_flags); }			\
> +								\
> +static inline void task_clear_##func(struct task_struct *p)	\
> +{ clear_bit(PFA_##name, &p->atomic_flags); }
> +
> +TASK_PFA_BITOPS(NO_NEW_PRIVS, no_new_privs)

This could really do with a corresponding script/tags.sh update.

	--regex-c++='TASK_PFA_BITOPS\([^,]*,([^)]*)\)/task_\1/'
	--regex-c++='TASK_PFA_BITOPS\([^,]*,([^)]*)\)/task_set_\1/'
	--regex-c++='TASK_PFA_BITOPS\([^,]*,([^)]*)\)/task_clear_\1/'

For exhuberant and matching bits for emacs.
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