From: Lance Yang <lance.yang@linux.dev>
To: songmuchun@bytedance.com
Cc: akpm@linux-foundation.org, david@kernel.org, osalvador@suse.de,
maddy@linux.ibm.com, corbet@lwn.net, muchun.song@linux.dev,
lance.yang@linux.dev, ljs@kernel.org, liam@infradead.org,
vbabka@kernel.org, rppt@kernel.org, surenb@google.com,
mhocko@suse.com, mpe@ellerman.id.au, npiggin@gmail.com,
chleroy@kernel.org, ritesh.list@gmail.com, sshegde@linux.ibm.com,
skhan@linuxfoundation.org, rdunlap@infradead.org,
qi.zheng@linux.dev, linux-mm@kvack.org,
linuxppc-dev@lists.ozlabs.org, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/4] powerpc/mm: map shared vmemmap tail pages as read-only
Date: Wed, 21 Oct 2026 13:40:29 +0800 [thread overview]
Message-ID: <20261021054029.98875-1-lance.yang@linux.dev> (raw)
In-Reply-To: <20261019090830.1917657-3-songmuchun@bytedance.com>
On Mon, Oct 19, 2026 at 05:08:28PM +0800, Muchun Song wrote:
>PowerPC radix uses an architecture-specific vmemmap population path for
>shared tail mappings, so it does not inherit the read-only protection added
>to the common path.
>
>Protect these mappings as well so illegal writes fault instead of
>corrupting metadata shared by multiple tail pages.
>
>Signed-off-by: Muchun Song <songmuchun@bytedance.com>
>---
Nothing jumped out at me, feel free to add:
Reviewed-by: Lance Yang <lance.yang@linux.dev>
next prev parent reply other threads:[~2026-10-21 5:40 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-19 9:08 [PATCH 0/4] mm: Enforce read-only shared vmemmap tail mappings Muchun Song
2026-10-19 9:08 ` [PATCH 1/4] mm/sparse-vmemmap: map shared vmemmap tail pages as read-only Muchun Song
2026-10-21 4:57 ` Lance Yang
2026-10-21 5:36 ` Muchun Song
2026-10-19 9:08 ` [PATCH 2/4] powerpc/mm: " Muchun Song
2026-10-21 5:40 ` Lance Yang [this message]
2026-10-30 0:26 ` Ritesh Harjani
2026-10-19 9:08 ` [PATCH 3/4] mm/hugetlb_vmemmap: remove vmemmap_wrprotect_hvo() Muchun Song
2026-10-21 6:07 ` Lance Yang
2026-10-19 9:08 ` [PATCH 4/4] mm/hugetlb_vmemmap: remove hugetlb_vmemmap_optimize_bootmem_folios() Muchun Song
2026-10-21 6:18 ` Lance Yang
2026-10-30 10:44 ` [PATCH 0/4] mm: Enforce read-only shared vmemmap tail mappings Pavithra
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