From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=74.125.82.169 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793320085; b=O4jge3pt03Qc17vZ7WGEP0wb4RmQWyhgZBfR3Ew/3iePZdLjseQUi3/ikEsUnfrEPBg8 DP4wSZYVXN5aVpIFuXWQCJE5+LmDLoUA1yAPDM6yKq0Yv8ItWivnXKOATy8xa2y5oJhy+ jfnjvw54hvhkl12CC6jE9qb5p2cM2h5P6exUm5oO9EDme0Cl6LbYn1b1RXnjR8YLUxWrk gByVwYcdOf1RvVU7zUssUb12ecnW3i+XkVuL+K6Stq7Dc7yCAzOP+IVC39dwAXcwlS1Lk HbuzIL1q0FOAz2fofMrpt49Ec3+5ogRns0ZM3PI/OWEwLNOOcc19yswEaqHVPiMbzGg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793320085; h=DMARC-Filter:Received:DKIM-Signature:X-Google-DKIM-Signature: X-Forwarded-Encrypted:X-Gm-Message-State:X-Gm-Gg:X-Received:Received: From:To:Cc:Subject:In-Reply-To:Date:Message-ID:References; bh=ux1Gd4wJ4i6CbO5kAuUr+fRClS71fFbOF44xw5i7O6M=; b=zAFOAvlCZwQTf3n7Y6XH+cDb1lYCfdlzzWxKBReonTYiXfgs7YqGJJ+n/EkFzdW13FHL P0DsJccmHTHJr//P9ex7g3DoF9Smfyod0E9VBVyWcZ3zq5ManuNAfO71+H8DZDKqXu1sf gq6GaSI1L71TkPWo99kheu4vo+kxZ63bAI/spm0JQzXEDjeaf3SvJxWYYRpcXB8N13Ugm 77u3sGQY2qcanbuQ/Y1m8DDXT2FGUwwBqhADzAjNzQ+P2yuAmTduCUuQ5EJmgLf/cKo2y REOIcpsV+p71LDwd955Mc4dU1GjHes5EzXJAdCdK30/SWT20WFv+x/wWBBne2WU5geg== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20260707 header.b=L3+GOBRP; arc=none smtp.remote-ip=74.125.82.169 Received: from mail-dy1-f169.google.com (mail-dy1-f169.google.com [74.125.82.169]) (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 962B6606A31A for ; Fri, 30 Oct 2026 00:28:04 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 962B6606A31A Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20260707 header.b=L3+GOBRP Received: by mail-dy1-f169.google.com with SMTP id 5a478bee46e88-36a315ed211so237891eec.0 for ; Thu, 29 Oct 2026 17:28:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20260707; t=1793320084; x=1793924884; darn=vger.kernel.org; h=references:message-id:date:in-reply-to:subject:cc:to:from:from:to :cc:subject:date:message-id:reply-to:content-type; bh=ux1Gd4wJ4i6CbO5kAuUr+fRClS71fFbOF44xw5i7O6M=; b=L3+GOBRPTYRzjFBeLhfr170NmUzssfs5NiKPaDyA7W0VzQOvDy6EneHxWu7dx5UZM6 Vd76mGp6zpdGPMOWyytLUcjxhWAQxnc/mr88KiN2S6H9hjCLMgZQnDZbJVZsU/yPh/Wk Y7t3XRVlZa9QwZhlS6tRojs3JYLCO37ZRjBn48oOqwUv6R1FY149WhynsS0KISfAUKKC hi+iqmRBoQ6Ounxl+scBgcdvE+9BaLP5iua0pqY3ZboOVfDOxrTQIBfYqmu+0Zs/EWaW corrJwYSotZi8BW/t9TQ6pvXdBrXT+V6oufqTC4cDTyn/fuYuFB3Kg+RgN6OWM8aYhUE mEpw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1793320084; x=1793924884; h=references:message-id:date:in-reply-to:subject:cc:to:from:x-gm-gg :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=ux1Gd4wJ4i6CbO5kAuUr+fRClS71fFbOF44xw5i7O6M=; b=uoaPpMLTzP4w1gTSsypNKC8zdfF9qIUri76z0B0y9NtmjLYdMtUwbHjpagtT4CMH2x +JduYqbw6PR+rq1zNBuHrgYYx2Dod/eB3XROejGFP3rzdhtmOxQcxktfdAgHStENTt8m ljC//tHHRUAkcy+c0p6IytYKV4ixbnZhyzLutUZHN6nVgs5rOD6doMcI63dv9QkWptNU Orj/9ajHPUljoH40aabmQQulceKNFk7r0kZePKFweeAuDw62GI76cqKqxenNMBGrY/iQ IhmG/1bEJO2jl5Gx3lelOX7VSIs4Fu7sEgLxLEMzK5R/3vuqmzyiZ46hw8EVUj5wn+jm 1u0w== X-Forwarded-Encrypted: i=1; AKwUvBx1Rd25NIrZXnxsZN1D83PO6ksOYYqhQFwrt2nQTwvE1L0LzjvnRRpqToGOOmvVq7V+4MSPIW3fnr4=@vger.kernel.org X-Gm-Message-State: AFq9FYImEtLZ86PbMvVcZaW/9ftc+TjrEjHmeQ1OWo3vzieXEulpCuNP HlFTTeTKDi9+gpl0Iq+gA7jfKk+nj7LVpWx1HopLMZzx91UJWqQOMIr4 X-Gm-Gg: AYBFou1jwyreNn+35ZCYmfafTvHNSrwerbMipS0Pe1TksRNnAxrGKc3Yr7PtXunDxTQ oV9knLRm/oRV9YknZtDvC6EXsmdatq0Jjvi0jvRVnyGXFuCVEuUPA4c/zCO1/JwbC89Y1i5nOIT ztKIEQU0VhKVJ2XRiJo/ci/nClxNtUkuDGEeuy62aqdJ8Z2UCbeumkygUVVyI2KDdnBOZID9P53 TjtRWaM8AFpad/S/L079kK9E2jkO4P0X3OyFj4sCAhp+LWduq8fH4ku1XYikYwuABMWyXfEOzjk 0wjze8jZaOZ/m66QykS6lzh3hUHSE8WQ0CdOVXTUq2sdN6ihBzFvvqng+oZrtqFA3qSp/2KovbL dF+DerEGQDmWaNmWHpNHoxprN8x22WWIwjzyp8EuZdg+Kcyh8BuPzoNIRlCld5/WRs5HXliUdFu ngBnLYGMcu7dg3roEvEQrYA7PQYTXuzEMKyO5FXfJKAVGPk+lL9I+rlj8oU8jf2abTtHAadDjkJ lALK5SIX3Bhu4ZqUw70PZ8vZge8nSo3k3px5XYvawQuSRWQ/R8kbmt/rtujgkIyEew3HEsevrhl 5HqjE5vCTDj9IC1t7cbgerz6sfaVncT/7I0M6OK9sjB1fHpR X-Received: by 2002:a05:7300:d20f:b0:353:5d7a:cabe with SMTP id 5a478bee46e88-36a3002ea6amr5283586eec.13.1793320083521; Thu, 29 Oct 2026 17:28:03 -0700 (PDT) Received: from pve-server ([49.205.216.49]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-36a428af1easm1883940eec.5.2026.10.29.17.27.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 29 Oct 2026 17:28:02 -0700 (PDT) From: Ritesh Harjani (IBM) To: Muchun Song , Andrew Morton , David Hildenbrand , Oscar Salvador , Madhavan Srinivasan , Jonathan Corbet Cc: Muchun Song , Lance Yang , Lorenzo Stoakes , "Liam R . Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Shrikanth Hegde , Shuah Khan , Randy Dunlap , Qi Zheng , linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Muchun Song Subject: Re: [PATCH 2/4] powerpc/mm: map shared vmemmap tail pages as read-only In-Reply-To: <20261019090830.1917657-3-songmuchun@bytedance.com> Date: Fri, 30 Oct 2026 05:56:16 +0530 Message-ID: References: <20261019090830.1917657-1-songmuchun@bytedance.com> <20261019090830.1917657-3-songmuchun@bytedance.com> X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list Muchun Song writes: > 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 > --- > arch/powerpc/mm/book3s64/radix_pgtable.c | 3 +++ > 1 file changed, 3 insertions(+) Looks good to me. Thanks for taking care of powerpc path as well. Feel free to add: Reviewed-by: Ritesh Harjani (IBM)