On Tue, 8 May 2018 17:44:46 +0100
Dave Martin <Dave.Martin@xxxxxxx> wrote:
> 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@xxxxxxx>
> Cc: Ingo Molnar <mingo@xxxxxxxxxx>
> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Acked-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
-- Steve
> Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
> ---
> 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);
> +}
> +
> 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) \
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