[RFC PATCH v3 2/4] arm64: fpsimd: Consistently use __this_cpu_ ops where appropriate

[ard.biesheuvel@linaro.org (Ard Biesheuvel)]

On 25 May 2017 at 18:24, Dave Martin <Dave.Martin@arm.com> wrote:
> __this_cpu_ ops are not used consistently with regard to this_cpu_
> ops in a couple of places in fpsimd.c.
>
> Since preemption is explicitly disabled in
> fpsimd_restore_current_state() and fpsimd_update_current_state(),
> this patch converts this_cpu_ ops in those functions to __this_cpu_
> ops.  This doesn't save cost on arm64, but benefits from additional
> assertions in the core code.
>
> Signed-off-by: Dave Martin <Dave.Martin@arm.com>

Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

> ---
>  arch/arm64/kernel/fpsimd.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c
> index 06da8ea..d7e5f8a 100644
> --- a/arch/arm64/kernel/fpsimd.c
> +++ b/arch/arm64/kernel/fpsimd.c
> @@ -194,7 +194,7 @@ void fpsimd_restore_current_state(void)
>                 struct fpsimd_state *st = &current->thread.fpsimd_state;
>
>                 fpsimd_load_state(st);
> -               this_cpu_write(fpsimd_last_state, st);
> +               __this_cpu_write(fpsimd_last_state, st);
>                 st->cpu = smp_processor_id();
>         }
>         preempt_enable();
> @@ -214,7 +214,7 @@ void fpsimd_update_current_state(struct fpsimd_state *state)
>         if (test_and_clear_thread_flag(TIF_FOREIGN_FPSTATE)) {
>                 struct fpsimd_state *st = &current->thread.fpsimd_state;
>
> -               this_cpu_write(fpsimd_last_state, st);
> +               __this_cpu_write(fpsimd_last_state, st);
>                 st->cpu = smp_processor_id();
>         }
>         preempt_enable();
> --
> 2.1.4
>