linux-kernel - Re: [PATCH 32/34] m68k: rework get_mmu

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Date:   Wed, 22 Nov 2023 00:39:05 +1000
From:   Greg Ungerer <gerg@...nel.org>
To:     Yury Norov <yury.norov@...il.com>, linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Hugh Dickins <hughd@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-m68k@...ts.linux-m68k.org
Cc:     Jan Kara <jack@...e.cz>,
        Mirsad Todorovac <mirsad.todorovac@....unizg.hr>,
        Matthew Wilcox <willy@...radead.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Maxim Kuvyrkov <maxim.kuvyrkov@...aro.org>,
        Alexey Klimov <klimov.linux@...il.com>
Subject: Re: [PATCH 32/34] m68k: rework get_mmu_context()

Hi Yury,

On 19/11/23 01:51, Yury Norov wrote:
> ALSA code opencodes atomic find_and_set_bit_wrap(). Switch it to
   ^^^^
m68k?


> dedicated function.
> 
> Signed-off-by: Yury Norov <yury.norov@...il.com>

Looks ok to me:

Acked-by: Greg Ungerer <gerg@...ux-m68k.org>

Regards
Greg



> ---
>   arch/m68k/include/asm/mmu_context.h | 11 +++++------
>   1 file changed, 5 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/m68k/include/asm/mmu_context.h b/arch/m68k/include/asm/mmu_context.h
> index 141bbdfad960..0419ad87a1c1 100644
> --- a/arch/m68k/include/asm/mmu_context.h
> +++ b/arch/m68k/include/asm/mmu_context.h
> @@ -35,12 +35,11 @@ static inline void get_mmu_context(struct mm_struct *mm)
>   		atomic_inc(&nr_free_contexts);
>   		steal_context();
>   	}
> -	ctx = next_mmu_context;
> -	while (test_and_set_bit(ctx, context_map)) {
> -		ctx = find_next_zero_bit(context_map, LAST_CONTEXT+1, ctx);
> -		if (ctx > LAST_CONTEXT)
> -			ctx = 0;
> -	}
> +
> +	do {
> +		ctx = find_and_set_bit_wrap(context_map, LAST_CONTEXT + 1, next_mmu_context);
> +	} while (ctx > LAST_CONTEXT);
> +
>   	next_mmu_context = (ctx + 1) & LAST_CONTEXT;
>   	mm->context = ctx;
>   	context_mm[ctx] = mm;