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From: "Oscar Salvador (SUSE)" <osalvador@kernel.org>
To: Muchun Song <songmuchun@bytedance.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	David Hildenbrand <david@kernel.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Paul Walmsley <pjw@kernel.org>,
	Huacai Chen <chenhuacai@kernel.org>,
	Andreas Larsson <andreas@gaisler.com>,
	"David S. Miller" <davem@davemloft.net>,
	Muchun Song <muchun.song@linux.dev>,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-riscv@lists.infradead.org, loongarch@lists.linux.dev,
	sparclinux@vger.kernel.org, Alexandre Ghiti <alex@ghiti.fr>,
	Albert Ou <aou@eecs.berkeley.edu>,
	WANG Xuerui <kernel@xen0n.name>, Lorenzo Stoakes <ljs@kernel.org>,
	"Liam R. Howlett" <liam@infradead.org>,
	Vlastimil Babka <vbabka@kernel.org>,
	Mike Rapoport <rppt@kernel.org>,
	Suren Baghdasaryan <surenb@google.com>,
	Michal Hocko <mhocko@suse.com>
Subject: Re: [PATCH v3 1/5] mm/sparse-vmemmap: provide generic vmemmap_set_pmd() and vmemmap_check_pmd()
Date: Tue, 2 Jun 2026 06:41:14 +0200	[thread overview]
Message-ID: <ah5e6i8EfoLUnyn2@localhost.localdomain> (raw)
In-Reply-To: <20260601084845.3792171-2-songmuchun@bytedance.com>

On Mon, Jun 01, 2026 at 04:48:40PM +0800, Muchun Song wrote:
> The two weak functions are currently no-ops on every architecture,
> forcing each platform that needs them to duplicate the same handful
> of lines.  Provide a generic implementation:
> 
> - vmemmap_set_pmd() simply sets a huge PMD with PAGE_KERNEL protection.
> 
> - vmemmap_check_pmd() verifies that the PMD is present and leaf,
>   then calls the existing vmemmap_verify() helper.
> 
> Architectures that need special handling can continue to override the
> weak symbols; everyone else gets the standard version for free.
> 
> Signed-off-by: Muchun Song <songmuchun@bytedance.com>

Acked-by: Oscar Salvador (SUSE) <osalvador@kernel.org>

 

-- 
Oscar Salvador
SUSE Labs


WARNING: multiple messages have this Message-ID (diff)
From: "Oscar Salvador (SUSE)" <osalvador@kernel.org>
To: Muchun Song <songmuchun@bytedance.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	David Hildenbrand <david@kernel.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Paul Walmsley <pjw@kernel.org>,
	Huacai Chen <chenhuacai@kernel.org>,
	Andreas Larsson <andreas@gaisler.com>,
	"David S. Miller" <davem@davemloft.net>,
	Muchun Song <muchun.song@linux.dev>,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-riscv@lists.infradead.org, loongarch@lists.linux.dev,
	sparclinux@vger.kernel.org, Alexandre Ghiti <alex@ghiti.fr>,
	Albert Ou <aou@eecs.berkeley.edu>,
	WANG Xuerui <kernel@xen0n.name>, Lorenzo Stoakes <ljs@kernel.org>,
	"Liam R. Howlett" <liam@infradead.org>,
	Vlastimil Babka <vbabka@kernel.org>,
	Mike Rapoport <rppt@kernel.org>,
	Suren Baghdasaryan <surenb@google.com>,
	Michal Hocko <mhocko@suse.com>
Subject: Re: [PATCH v3 1/5] mm/sparse-vmemmap: provide generic vmemmap_set_pmd() and vmemmap_check_pmd()
Date: Tue, 2 Jun 2026 06:41:14 +0200	[thread overview]
Message-ID: <ah5e6i8EfoLUnyn2@localhost.localdomain> (raw)
In-Reply-To: <20260601084845.3792171-2-songmuchun@bytedance.com>

On Mon, Jun 01, 2026 at 04:48:40PM +0800, Muchun Song wrote:
> The two weak functions are currently no-ops on every architecture,
> forcing each platform that needs them to duplicate the same handful
> of lines.  Provide a generic implementation:
> 
> - vmemmap_set_pmd() simply sets a huge PMD with PAGE_KERNEL protection.
> 
> - vmemmap_check_pmd() verifies that the PMD is present and leaf,
>   then calls the existing vmemmap_verify() helper.
> 
> Architectures that need special handling can continue to override the
> weak symbols; everyone else gets the standard version for free.
> 
> Signed-off-by: Muchun Song <songmuchun@bytedance.com>

Acked-by: Oscar Salvador (SUSE) <osalvador@kernel.org>

 

-- 
Oscar Salvador
SUSE Labs

_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv

  parent reply	other threads:[~2026-06-02  4:41 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-06-01  8:48 [PATCH v3 0/5] mm/sparse-vmemmap: Provide generic vmemmap_set_pmd() and vmemmap_check_pmd() Muchun Song
2026-06-01  8:48 ` Muchun Song
2026-06-01  8:48 ` [PATCH v3 1/5] mm/sparse-vmemmap: provide " Muchun Song
2026-06-01  8:48   ` Muchun Song
2026-06-01 12:22   ` David Hildenbrand (Arm)
2026-06-01 12:22     ` David Hildenbrand (Arm)
2026-06-01 12:37     ` Muchun Song
2026-06-01 12:37       ` Muchun Song
2026-06-02  4:40       ` Oscar Salvador (SUSE)
2026-06-02  4:40         ` Oscar Salvador (SUSE)
2026-06-02  4:41   ` Oscar Salvador (SUSE) [this message]
2026-06-02  4:41     ` Oscar Salvador (SUSE)
2026-06-01  8:48 ` [PATCH v3 2/5] arm64/mm: drop vmemmap_pmd helpers and use generic code Muchun Song
2026-06-01  8:48   ` Muchun Song
2026-06-01 12:23   ` David Hildenbrand (Arm)
2026-06-01 12:23     ` David Hildenbrand (Arm)
2026-06-02  4:42   ` Oscar Salvador (SUSE)
2026-06-02  4:42     ` Oscar Salvador (SUSE)
2026-06-01  8:48 ` [PATCH v3 3/5] riscv/mm: " Muchun Song
2026-06-01  8:48   ` Muchun Song
2026-06-01 12:23   ` David Hildenbrand (Arm)
2026-06-01 12:23     ` David Hildenbrand (Arm)
2026-06-02  4:44   ` Oscar Salvador (SUSE)
2026-06-02  4:44     ` Oscar Salvador (SUSE)
2026-06-01  8:48 ` [PATCH v3 4/5] loongarch/mm: drop vmemmap_check_pmd helper " Muchun Song
2026-06-01  8:48   ` Muchun Song
2026-06-01 12:24   ` David Hildenbrand (Arm)
2026-06-01 12:24     ` David Hildenbrand (Arm)
2026-06-01 12:26     ` Muchun Song
2026-06-01 12:26       ` Muchun Song
2026-06-02  4:45   ` Oscar Salvador (SUSE)
2026-06-02  4:45     ` Oscar Salvador (SUSE)
2026-06-01  8:48 ` [PATCH v3 5/5] sparc/mm: " Muchun Song
2026-06-01  8:48   ` Muchun Song
2026-06-01 12:25   ` David Hildenbrand (Arm)
2026-06-01 12:25     ` David Hildenbrand (Arm)
2026-06-02  4:46   ` Oscar Salvador (SUSE)
2026-06-02  4:46     ` Oscar Salvador (SUSE)

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