Re: [PATCH v10 02/18] thread_info: Add update_thread_flag() helpers

["Alex Bennée" <alex.bennee@linaro.org>]

Dave Martin <Dave.Martin@arm.com> writes:

> There are a number of bits of code sprinkled around the kernel to
> set a thread flag if a certain condition is true, and clear it
> otherwise.
>
> To help make those call sites terser and less cumbersome, this
> patch adds a new family of thread flag manipulators
>
> 	update*_thread_flag([...,] flag, cond)
>
> which do the equivalent of:
>
> 	if (cond)
> 		set*_thread_flag([...,] flag);
> 	else
> 		clear*_thread_flag([...,] flag);
>
> Signed-off-by: Dave Martin <Dave.Martin@arm.com>
> Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
> Acked-by: Marc Zyngier <marc.zyngier@arm.com>
> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Ingo Molnar <mingo@redhat.com>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Oleg Nesterov <oleg@redhat.com>
> ---
>  include/linux/sched.h       |  6 ++++++
>  include/linux/thread_info.h | 11 +++++++++++
>  2 files changed, 17 insertions(+)
>
> diff --git a/include/linux/sched.h b/include/linux/sched.h
> index b3d697f..c2c3051 100644
> --- a/include/linux/sched.h
> +++ b/include/linux/sched.h
> @@ -1578,6 +1578,12 @@ static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
>  	clear_ti_thread_flag(task_thread_info(tsk), flag);
>  }
>
> +static inline void update_tsk_thread_flag(struct task_struct *tsk, int flag,
> +					  bool value)
> +{
> +	update_ti_thread_flag(task_thread_info(tsk), flag, value);
> +}
> +
>  static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
>  {
>  	return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
> diff --git a/include/linux/thread_info.h b/include/linux/thread_info.h
> index cf2862b..8d8821b 100644
> --- a/include/linux/thread_info.h
> +++ b/include/linux/thread_info.h
> @@ -60,6 +60,15 @@ static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
>  	clear_bit(flag, (unsigned long *)&ti->flags);
>  }
>
> +static inline void update_ti_thread_flag(struct thread_info *ti, int flag,
> +					 bool value)
> +{
> +	if (value)
> +		set_ti_thread_flag(ti, flag);
> +	else
> +		clear_ti_thread_flag(ti, flag);
> +}
> +

value does seem a bit of vanilla non-informative name for a condition
flag but whatever:

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>


>  static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag)
>  {
>  	return test_and_set_bit(flag, (unsigned long *)&ti->flags);
> @@ -79,6 +88,8 @@ static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
>  	set_ti_thread_flag(current_thread_info(), flag)
>  #define clear_thread_flag(flag) \
>  	clear_ti_thread_flag(current_thread_info(), flag)
> +#define update_thread_flag(flag, value) \
> +	update_ti_thread_flag(current_thread_info(), flag, value)
>  #define test_and_set_thread_flag(flag) \
>  	test_and_set_ti_thread_flag(current_thread_info(), flag)
>  #define test_and_clear_thread_flag(flag) \


--
Alex Bennée

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