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List: linux-m68k
Subject: Re: [PATCH 32/34] m68k: rework get_mmu_context()
From: Greg Ungerer <gerg () kernel ! org>
Date: 2023-11-21 14:39:05
Message-ID: 1f38c998-93e9-4dbb-abc8-401d8175dad4 () kernel ! org
[Download RAW message or body]
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@gmail.com>
Looks ok to me:
Acked-by: Greg Ungerer <gerg@linux-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;
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