Re: [PATCH v10 03/18] arm64: Use update{,_tsk}_thread_flag()

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

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

> This patch uses the new update_thread_flag() helpers to simplify a
> couple of if () set; else clear; constructs.
>
> No functional change.
>
> Signed-off-by: Dave Martin <Dave.Martin@arm.com>
> Acked-by: Marc Zyngier <marc.zyngier@arm.com>
> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Will Deacon <will.deacon@arm.com>

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

> ---
>  arch/arm64/kernel/fpsimd.c | 18 ++++++++----------
>  1 file changed, 8 insertions(+), 10 deletions(-)
>
> diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c
> index 12e1c96..9d85373 100644
> --- a/arch/arm64/kernel/fpsimd.c
> +++ b/arch/arm64/kernel/fpsimd.c
> @@ -618,10 +618,8 @@ int sve_set_vector_length(struct task_struct *task,
>  	task->thread.sve_vl = vl;
>
>  out:
> -	if (flags & PR_SVE_VL_INHERIT)
> -		set_tsk_thread_flag(task, TIF_SVE_VL_INHERIT);
> -	else
> -		clear_tsk_thread_flag(task, TIF_SVE_VL_INHERIT);
> +	update_tsk_thread_flag(task, TIF_SVE_VL_INHERIT,
> +			       flags & PR_SVE_VL_INHERIT);
>
>  	return 0;
>  }
> @@ -910,12 +908,12 @@ void fpsimd_thread_switch(struct task_struct *next)
>  		 * the TIF_FOREIGN_FPSTATE flag so the state will be loaded
>  		 * upon the next return to userland.
>  		 */
> -		if (__this_cpu_read(fpsimd_last_state.st) ==
> -			&next->thread.uw.fpsimd_state
> -		    && next->thread.fpsimd_cpu == smp_processor_id())
> -			clear_tsk_thread_flag(next, TIF_FOREIGN_FPSTATE);
> -		else
> -			set_tsk_thread_flag(next, TIF_FOREIGN_FPSTATE);
> +		bool wrong_task = __this_cpu_read(fpsimd_last_state.st) !=
> +					&next->thread.uw.fpsimd_state;
> +		bool wrong_cpu = next->thread.fpsimd_cpu != smp_processor_id();
> +
> +		update_tsk_thread_flag(next, TIF_FOREIGN_FPSTATE,
> +				       wrong_task || wrong_cpu);
>  	}
>  }


--
Alex Bennée

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