From nobody Sun Feb 8 17:43:45 2026 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id C94D025D531 for ; Mon, 28 Apr 2025 12:05:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745841913; cv=none; b=AMDz899/1WVtbM+TCjrhNANOtj+sbWnU0IqoHFCWhtjPXKSM0dP/yc6FZl/Z4EXT3VVIt/etukBLLhKMbBbsB7/HRGdd5BN4e3Jz4wM2UAMPTM7HLBW7ciI1Seyj5ED0aEGii1QfOBbeQjpUKt1Q8Z2V7mPlLk2K3eSCKZ/v7gY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745841913; c=relaxed/simple; bh=MEf9UWmFTT/bt+07zDYWjS5BDus75XQTfdSRt1CVO4M=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=iLR19ywDVbeLwD+7u7YPfqdhh4cjRc9H3wa8XcHlPEkpIUbRpV1wueRGBepmRk3NS9ZrELdjvqIWhv1WpxFf6M8oPzKQxSRAp6o8mULUGVcMMWKgHQcwc01EDnhf3EXRh7espLfe5jXDDl6YEwfOfrGXvuOMva6xVaJWHHIGAA0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 52ACF22BE; Mon, 28 Apr 2025 05:05:02 -0700 (PDT) Received: from K4MQJ0H1H2.arm.com (unknown [10.163.78.210]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id D26543F66E; Mon, 28 Apr 2025 05:04:58 -0700 (PDT) From: Dev Jain To: akpm@linux-foundation.org Cc: ryan.roberts@arm.com, david@redhat.com, willy@infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, catalin.marinas@arm.com, will@kernel.org, Liam.Howlett@oracle.com, lorenzo.stoakes@oracle.com, vbabka@suse.cz, jannh@google.com, anshuman.khandual@arm.com, peterx@redhat.com, joey.gouly@arm.com, ioworker0@gmail.com, baohua@kernel.org, kevin.brodsky@arm.com, quic_zhenhuah@quicinc.com, christophe.leroy@csgroup.eu, yangyicong@hisilicon.com, linux-arm-kernel@lists.infradead.org, namit@vmware.com, hughd@google.com, yang@os.amperecomputing.com, ziy@nvidia.com, Dev Jain Subject: [PATCH 3/7] mm: Add batched versions of ptep_modify_prot_start/commit Date: Mon, 28 Apr 2025 17:34:10 +0530 Message-Id: <20250428120414.12101-4-dev.jain@arm.com> X-Mailer: git-send-email 2.39.3 (Apple Git-146) In-Reply-To: <20250428120414.12101-1-dev.jain@arm.com> References: <20250428120414.12101-1-dev.jain@arm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Batch ptep_modify_prot_start/commit in preparation for optimizing mprotect. Architecture can override these helpers. Signed-off-by: Dev Jain --- include/linux/pgtable.h | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h index b50447ef1c92..ed287289335f 100644 --- a/include/linux/pgtable.h +++ b/include/linux/pgtable.h @@ -891,6 +891,44 @@ static inline void wrprotect_ptes(struct mm_struct *mm= , unsigned long addr, } #endif =20 +/* See the comment for ptep_modify_prot_start */ +#ifndef modify_prot_start_ptes +static inline pte_t modify_prot_start_ptes(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep, unsigned int nr) +{ + pte_t pte, tmp_pte; + + pte =3D ptep_modify_prot_start(vma, addr, ptep); + while (--nr) { + ptep++; + addr +=3D PAGE_SIZE; + tmp_pte =3D ptep_modify_prot_start(vma, addr, ptep); + if (pte_dirty(tmp_pte)) + pte =3D pte_mkdirty(pte); + if (pte_young(tmp_pte)) + pte =3D pte_mkyoung(pte); + } + return pte; +} +#endif + +/* See the comment for ptep_modify_prot_commit */ +#ifndef modify_prot_commit_ptes +static inline void modify_prot_commit_ptes(struct vm_area_struct *vma, uns= igned long addr, + pte_t *ptep, pte_t old_pte, pte_t pte, unsigned int nr) +{ + for (;;) { + ptep_modify_prot_commit(vma, addr, ptep, old_pte, pte); + if (--nr =3D=3D 0) + break; + ptep++; + addr +=3D PAGE_SIZE; + old_pte =3D pte_next_pfn(old_pte); + pte =3D pte_next_pfn(pte); + } +} +#endif + /* * On some architectures hardware does not set page access bit when access= ing * memory page, it is responsibility of software setting this bit. It brin= gs --=20 2.30.2