From nobody Sun Feb 8 02:59:46 2026 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id D8004155C97 for ; Mon, 16 Sep 2024 11:08:10 +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=1726484892; cv=none; b=uvmwG2YSOqxfmGgCmoOtUCHNL8VvgvBxSg3azbEfKaX4z8ZFgGLrynuvlV1SJR5K9qxy4Eo3pNaicZW9IQKvVhZZkpNLOz8u+/5+rztZ0BCGgpx/qIIrTgbJ2xTmoeIK71Q4/zU9d5NPzzcGVEaVTS2bGJRC9fyj1kAo67xlz9w= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726484892; c=relaxed/simple; bh=SlxPPXkO/fNfzVA5uO56YUKVgem7p+wES/1xBe8JqeY=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=QPKR1fIe4wZ9RMnVDBk1IUHphKLNH7KUmujqyd5xPdj1e18QXE/KiZ7wfCFOC998znMjk4LtLlcEEKHaerMVyUyvOBsMtMAgCwf49wbh+w44D178IdzX8gi+yKODKYTYJvyaGQnzlm+/TtYt1m81SWoTyzk0+qe14AJFRJ0vR0U= 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 6AAE812FC; Mon, 16 Sep 2024 04:08:39 -0700 (PDT) Received: from e116581.blr.arm.com (e116581.arm.com [10.162.42.11]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id DF6683F64C; Mon, 16 Sep 2024 04:08:04 -0700 (PDT) From: Dev Jain To: akpm@linux-foundation.org, david@redhat.com, willy@infradead.org Cc: ryan.roberts@arm.com, anshuman.khandual@arm.com, baohua@kernel.org, hughd@google.com, ioworker0@gmail.com, wangkefeng.wang@huawei.com, baolin.wang@linux.alibaba.com, gshan@redhat.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Dev Jain Subject: [PATCH v2 1/2] mm: Make pte_range_none() return number of empty PTEs Date: Mon, 16 Sep 2024 16:37:53 +0530 Message-Id: <20240916110754.1236200-2-dev.jain@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240916110754.1236200-1-dev.jain@arm.com> References: <20240916110754.1236200-1-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" In preparation for the second patch, make pte_range_none() return the number of contiguous empty PTEs. Signed-off-by: Dev Jain Reviewed-by: Baolin Wang Reviewed-by: Barry Song --- mm/memory.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/mm/memory.c b/mm/memory.c index 6469ac99f2f7..8bb1236de93c 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -4617,16 +4617,16 @@ vm_fault_t do_swap_page(struct vm_fault *vmf) return ret; } =20 -static bool pte_range_none(pte_t *pte, int nr_pages) +static int pte_range_none(pte_t *pte, int nr_pages) { int i; =20 for (i =3D 0; i < nr_pages; i++) { if (!pte_none(ptep_get_lockless(pte + i))) - return false; + return i; } =20 - return true; + return nr_pages; } =20 static struct folio *alloc_anon_folio(struct vm_fault *vmf) @@ -4671,7 +4671,7 @@ static struct folio *alloc_anon_folio(struct vm_fault= *vmf) order =3D highest_order(orders); while (orders) { addr =3D ALIGN_DOWN(vmf->address, PAGE_SIZE << order); - if (pte_range_none(pte + pte_index(addr), 1 << order)) + if (pte_range_none(pte + pte_index(addr), 1 << order) =3D=3D 1 << order) break; order =3D next_order(&orders, order); } @@ -4787,7 +4787,7 @@ static vm_fault_t do_anonymous_page(struct vm_fault *= vmf) if (nr_pages =3D=3D 1 && vmf_pte_changed(vmf)) { update_mmu_tlb(vma, addr, vmf->pte); goto release; - } else if (nr_pages > 1 && !pte_range_none(vmf->pte, nr_pages)) { + } else if (nr_pages > 1 && pte_range_none(vmf->pte, nr_pages) !=3D nr_pag= es) { update_mmu_tlb_range(vma, addr, vmf->pte, nr_pages); goto release; } @@ -5121,7 +5121,7 @@ vm_fault_t finish_fault(struct vm_fault *vmf) update_mmu_tlb(vma, addr, vmf->pte); ret =3D VM_FAULT_NOPAGE; goto unlock; - } else if (nr_pages > 1 && !pte_range_none(vmf->pte, nr_pages)) { + } else if (nr_pages > 1 && pte_range_none(vmf->pte, nr_pages) !=3D nr_pag= es) { update_mmu_tlb_range(vma, addr, vmf->pte, nr_pages); ret =3D VM_FAULT_NOPAGE; goto unlock; --=20 2.30.2