From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=95.215.58.68 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1792561240; b=qeMi4P3WtSLz5+/wpGDkYUi+uP6uFty2hq6IFOWZ2854MFAgH37FK5PZba3Utf5DdKFP ycHxs5HY5UnEkF/7tHHKWp1ztoV5RAzqoDhwVhyi8ZfepAhxCIeSXbsshkS0GqoijyLZP GHkriRVIinkwJF09TQ/wg+fw61KVRQ1BGILijmIcFWQ3Spf2oFULa0EHgazFhNmRr7Vn6 dRdvHjSY+l3IFkXkYHVP6GNxe6u8VgFtupcp2rTVWbgsfANnYRzMxmM/soflEigRQsWrq 2UUJrXBIajWue0urQ1G20TKamPh6HmRJlfJ+l/uNA39IdP10U2K/818ksE1cdu1jA3w== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1792561240; h=DMARC-Filter:X-Envelope-To:DKIM-Signature:X-Envelope-To:Received: X-Mizu-Trace-ID:X-Migadu-Flow:From:To:Cc:Subject:Date:Message-ID: X-Mailer:In-Reply-To:References:MIME-Version:Content-Type: Content-Transfer-Encoding; bh=MXiUGp1caAHyyuVtstCR/2L4nYD+n3m1gvu2wPtLXMI=; b=zMvFRGtA84a1SA4EPWVWRQa4sOuPsF7MLejzfAFp/myxREo7F7BSlLAWEe4McvXs4wkK lunVXzIoX224NPo72obGik2DlbuRILMJBSJGJJr3p9nYRtDDUkiiu4sIKI8Ay9foNdRac F+8nlETSsa9QU8mh45PukAdQcAvIR0Lm+UG5lCxO/JTkhokJXp7qb5CHVKp04MNNkTPzD 7kbZqf/DdsNlGeuzpXvUo4JiilYIfKSgbLroQbscltyeTegnozvCaSQ+Ma8WvM2KUYdzE z85xU5ZFlZBjIL/xOv5XE06bfdurX8gR3D8t46AR8JX4gQIzedCuQEmsWzZJtwqPtkg== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=C+vG9SFB; arc=none smtp.remote-ip=95.215.58.68 Received: from mta1.migadu.com (out-68.mta1.migadu.com [95.215.58.68]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9BA2A606A31A for ; Wed, 21 Oct 2026 05:40:39 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 9BA2A606A31A Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=C+vG9SFB X-Envelope-To: linux-kernel@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=MXiUGp1caAHyyuVtstCR/2L4nYD+n3m1gvu2wPtLXMI=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1792561237; v=1; x=1793166037; b=C+vG9SFBdBQyzmPAziKyxgOkVqVFMKpFAz91RKnVqhXiTWdcCNqsz48DU9VR4qp/m0yzSUQV Ukar89XaW1+7SLsXgAbtzL1jRmim1TE67erPvFkI9qwWgjmSW5einQc4C9m+YgKG5Gw8xPPaM06 EGYG7YWYbrPWjGGM4uejPjW4= X-Envelope-To: linux-kernel@vger.kernel.org Received: by smtp.migadu.com with ESMTPS id d2fc8a9e32f8bec1; Wed, 21 Oct 2026 05:40:35 +0000 X-Mizu-Trace-ID: d2fc8a9e32f8bec1 X-Migadu-Flow: FLOW_OUT From: Lance Yang 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 Message-ID: <20261021054029.98875-1-lance.yang@linux.dev> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20261019090830.1917657-3-songmuchun@bytedance.com> References: <20261019090830.1917657-3-songmuchun@bytedance.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 >--- Nothing jumped out at me, feel free to add: Reviewed-by: Lance Yang