From: Geert Uytterhoeven <geert@linux-m68k.org>
To: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
linux-arch@vger.kernel.org, torvalds@linux-foundation.org,
npiggin@gmail.com
Subject: Re: [PATCH v2 09/17] m68k: Implement xor_unlock_is_negative_byte
Date: Thu, 5 Oct 2023 10:11:34 +0200 [thread overview]
Message-ID: <CAMuHMdUv-iALRvpBacsKOAo3P1Rgpf5g=taWqdt=5t-1Xjg9Rw@mail.gmail.com> (raw)
In-Reply-To: <20231004165317.1061855-10-willy@infradead.org>
On Wed, Oct 4, 2023 at 6:53 PM Matthew Wilcox (Oracle)
<willy@infradead.org> wrote:
> Using EOR to clear the guaranteed-to-be-set lock bit will test the
> negative flag just like the x86 implementation. This should be
> more efficient than the generic implementation in filemap.c. It
> would be better if m68k had __GCC_ASM_FLAG_OUTPUTS__.
>
> Coldfire doesn't have a byte-sized EOR, so we test bit 7 after the
> EOR, which is a second memory access, but it's slightly better than
> the current C code.
>
> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
next prev parent reply other threads:[~2023-10-05 8:11 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-04 16:53 [PATCH v2 00/17] Add folio_end_read Matthew Wilcox (Oracle)
2023-10-04 16:53 ` [PATCH v2 01/17] iomap: Hold state_lock over call to ifs_set_range_uptodate() Matthew Wilcox (Oracle)
2023-10-04 16:53 ` [PATCH v2 02/17] iomap: Protect read_bytes_pending with the state_lock Matthew Wilcox (Oracle)
2023-10-04 16:53 ` [PATCH v2 03/17] mm: Add folio_end_read() Matthew Wilcox (Oracle)
2024-02-23 15:26 ` Tetsuo Handa
2024-02-23 15:36 ` Matthew Wilcox
2023-10-04 16:53 ` [PATCH v2 04/17] ext4: Use folio_end_read() Matthew Wilcox (Oracle)
2023-10-04 16:53 ` [PATCH v2 05/17] buffer: " Matthew Wilcox (Oracle)
2023-10-04 16:53 ` [PATCH v2 06/17] iomap: " Matthew Wilcox (Oracle)
2023-10-04 16:53 ` [PATCH v2 07/17] bitops: Add xor_unlock_is_negative_byte() Matthew Wilcox (Oracle)
2023-10-04 16:53 ` [PATCH v2 08/17] alpha: Implement xor_unlock_is_negative_byte Matthew Wilcox (Oracle)
2023-10-04 16:53 ` [PATCH v2 09/17] m68k: " Matthew Wilcox (Oracle)
2023-10-04 23:49 ` Greg Ungerer
2023-10-05 8:11 ` Geert Uytterhoeven [this message]
2023-10-04 16:53 ` [PATCH v2 10/17] mips: " Matthew Wilcox (Oracle)
2023-10-04 16:53 ` [PATCH v2 11/17] powerpc: Implement arch_xor_unlock_is_negative_byte on 32-bit Matthew Wilcox (Oracle)
2023-10-04 16:53 ` [PATCH v2 12/17] riscv: Implement xor_unlock_is_negative_byte Matthew Wilcox (Oracle)
2023-10-04 16:53 ` [PATCH v2 13/17] s390: Implement arch_xor_unlock_is_negative_byte Matthew Wilcox (Oracle)
2023-10-04 16:53 ` [PATCH v2 14/17] mm: Delete checks for xor_unlock_is_negative_byte() Matthew Wilcox (Oracle)
2023-10-05 8:12 ` Geert Uytterhoeven
2023-10-04 16:53 ` [PATCH v2 15/17] mm: Add folio_xor_flags_has_waiters() Matthew Wilcox (Oracle)
2023-10-04 16:53 ` [PATCH v2 16/17] mm: Make __end_folio_writeback() return void Matthew Wilcox (Oracle)
2023-10-04 16:53 ` [PATCH v2 17/17] mm: Use folio_xor_flags_has_waiters() in folio_end_writeback() Matthew Wilcox (Oracle)
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