From: Catalin Marinas <catalin.marinas@arm.com>
To: Mike Rapoport <rppt@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Andreas Larsson <andreas@gaisler.com>,
Borislav Petkov <bp@alien8.de>, Brian Cain <bcain@kernel.org>,
"Christophe Leroy (CS GROUP)" <chleroy@kernel.org>,
"David S. Miller" <davem@davemloft.net>,
Dave Hansen <dave.hansen@linux.intel.com>,
David Hildenbrand <david@kernel.org>,
Dinh Nguyen <dinguyen@kernel.org>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Guo Ren <guoren@kernel.org>, Helge Deller <deller@gmx.de>,
Huacai Chen <chenhuacai@kernel.org>,
Ingo Molnar <mingo@redhat.com>,
Johannes Berg <johannes@sipsolutions.net>,
John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>,
"Liam R. Howlett" <Liam.Howlett@oracle.com>,
Lorenzo Stoakes <lorenzo.stoakes@oracle.com>,
Madhavan Srinivasan <maddy@linux.ibm.com>,
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linux-mm@kvack.org, x86@kernel.org
Subject: Re: [PATCH v2 4/4] mm: cache struct page for empty_zero_page and return it from ZERO_PAGE()
Date: Tue, 10 Feb 2026 15:06:51 +0000 [thread overview]
Message-ID: <aYtJi4uNcpoCTK_x@arm.com> (raw)
In-Reply-To: <20260209144058.2092871-5-rppt@kernel.org>
On Mon, Feb 09, 2026 at 04:40:57PM +0200, Mike Rapoport wrote:
> From: "Mike Rapoport (Microsoft)" <rppt@kernel.org>
>
> For most architectures every invocation of ZERO_PAGE() does
> virt_to_page(empty_zero_page). But empty_zero_page is in BSS and it is
> enough to get its struct page once at initialization time and then use
> it whenever a zero page should be accessed.
>
> Add yet another __zero_page variable that will be initialized as
> virt_to_page(empty_zero_page) for most architectures in a weak
> arch_setup_zero_pages() function.
>
> For architectures that use colored zero pages (MIPS and s390) rename their
> setup_zero_pages() to arch_setup_zero_pages() and make it global rather
> than static.
>
> For architectures that cannot use virt_to_page() for BSS (arm64 and
> sparc64) add override of arch_setup_zero_pages().
>
> Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
For arm64:
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
prev parent reply other threads:[~2026-02-10 15:07 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-09 14:40 [PATCH v2 0/4] arch, mm: consolidate empty_zero_page Mike Rapoport
2026-02-09 14:40 ` [PATCH v2 1/4] mm: don't special case !MMU for is_zero_pfn() and my_zero_pfn() Mike Rapoport
2026-02-09 14:40 ` [PATCH v2 2/4] mm: rename my_zero_pfn() to zero_pfn() Mike Rapoport
2026-02-09 15:08 ` Christophe Leroy (CS GROUP)
2026-02-10 14:50 ` Mike Rapoport
2026-02-10 14:52 ` Lorenzo Stoakes
2026-02-10 15:11 ` Mike Rapoport
2026-02-09 14:40 ` [PATCH v2 3/4] arch, mm: consolidate empty_zero_page Mike Rapoport
2026-02-09 15:20 ` Dave Hansen
2026-02-10 15:00 ` Catalin Marinas
2026-02-09 14:40 ` [PATCH v2 4/4] mm: cache struct page for empty_zero_page and return it from ZERO_PAGE() Mike Rapoport
2026-02-10 15:06 ` Catalin Marinas [this message]
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