From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2D226395AC2; Fri, 10 Jul 2026 20:19:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783714746; cv=none; b=dKIyLoiWQKTGtMJNWKsLOy1/X0GqRKlUs0kPpxrNXGJtIG57ORGgBdNGbg8d62fOHyFciW3T5I10U1fhj9SNGLtOt8YgV+Td8Ffg+IaYXpbM65JYeNqAOKXeuuPL27KnONCNUcaSIwH4iSep2vs5UBv1FBMY1Aqc8F8o3E8zxns= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783714746; c=relaxed/simple; bh=CFZAjloP4OpDX/vjHQ9xfGU3kS1+MIW18Lzf2dxH2BQ=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=ecwEAqf+xTatpjdOlp7PC6G46aBAifhr8nkRr1WvStjMXWH4a1axYMF5MSrunDarmf50lujhjOyF6S85dwR17wVMiNN2OZjB8Arz1nhQLKLp3tW052CYHvV244hVvMuUj2XLrU/uvA5bpWdj1aBblFQAzL89x/nbGNUvyikTVYY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=PNLB4wzm; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="PNLB4wzm" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 322B91F000E9; Fri, 10 Jul 2026 20:18:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783714744; bh=5hYSYZL26i46R1YNC969ZGJ/HD8KnaWEcgglVNhE+Dg=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=PNLB4wzmcFTj3lyqpCjpFNseunRPOUiWwMslZHwgnXN/dz1H6bINuUrT04kt5iEp1 +NIb6HuWlNuqv89DVOB740oeyMjE3pCofc2ChzUc2YR4KtFhvnDcCHt+4GCE+gyXWn 5N+MnWj5rOmm6UXVmu60Jc6I2MfPK0J7bSg9uQcFU6wtGwwH23rkV+6hwUKmgWbLk+ Tctr26pEiWgizGIADOVEl3UfVfSGQDtV+0/95Ja8Pr6D6O/cbPUvsrZRSsYIjPhVRH yBJazCl6C5Rhic0/GCGXO+3WaXAvZ1vidl5uvgn9Xm7ag6HsGdXlfnoynuPxHBZ7uA zki2RHAqu/Mww== From: Lorenzo Stoakes Date: Fri, 10 Jul 2026 21:16:45 +0100 Subject: [PATCH v2 04/33] mm: introduce and use vma_end_pgoff() Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260710-b4-pre-scalable-cow-v2-4-2a5aa403d977@kernel.org> References: <20260710-b4-pre-scalable-cow-v2-0-2a5aa403d977@kernel.org> In-Reply-To: <20260710-b4-pre-scalable-cow-v2-0-2a5aa403d977@kernel.org> To: Andrew Morton , David Hildenbrand , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Rik van Riel , Harry Yoo , Jann Horn , Lance Yang , Pedro Falcato , Russell King , Dinh Nguyen , Simon Schuster , "James E.J. Bottomley" , Helge Deller , Alexander Viro , Christian Brauner , Jan Kara , Dan Williams , Matthew Wilcox , Muchun Song , Oscar Salvador , Masami Hiramatsu , Oleg Nesterov , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , James Clark , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Miaohe Lin , Naoya Horiguchi , Xu Xin , Chengming Zhou , SJ Park , Matthew Brost , Joshua Hahn , Rakie Kim , Byungchul Park , Gregory Price , Ying Huang , Alistair Popple , Hugh Dickins , Peter Xu , Kees Cook , Marek Szyprowski , Robin Murphy , Andrey Konovalov , Alexander Potapenko , Dmitry Vyukov , Steven Rostedt , Mathieu Desnoyers , Jarkko Sakkinen , Dave Hansen , Thomas Gleixner , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" , Ian Abbott , H Hartley Sweeten , Lucas Stach , Christian Gmeiner , David Airlie , Simona Vetter , Patrik Jakobsson , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Rob Clark , Dmitry Baryshkov , Abhinav Kumar , Jessica Zhang , Sean Paul , Marijn Suijten , Tomi Valkeinen , Thierry Reding , Mikko Perttunen , Jonathan Hunter , Christian Koenig , Huang Rui , Matthew Auld , Jason Gunthorpe , Yishai Hadas , Shameer Kolothum , Kevin Tian , Ankit Agrawal , Alex Williamson , Paolo Bonzini , Shakeel Butt , Usama Arif Cc: Lorenzo Stoakes , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-parisc@vger.kernel.org, linux-fsdevel@vger.kernel.org, nvdimm@lists.linux.dev, linux-perf-users@vger.kernel.org, linux-trace-kernel@vger.kernel.org, damon@lists.linux.dev, iommu@lists.linux.dev, kasan-dev@googlegroups.com, linux-sgx@vger.kernel.org, etnaviv@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org, linux-tegra@vger.kernel.org, kvm@vger.kernel.org, Russell King X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=2641; i=ljs@kernel.org; h=from:subject:message-id; bh=CFZAjloP4OpDX/vjHQ9xfGU3kS1+MIW18Lzf2dxH2BQ=; b=owGbwMvMwCV2fu7ZrsZH9SKMp9WSGLICg61qc+aHMPw9/vjPW+ln592Xp0tkZNzkUJwaKjbTT FZJejNnRykLgxgXg6yYIsvzL+L7g0TC5nVe8HeDmcPKBDKEgYtTACZy/Q3D/4hbiseXv3Ar8Z5d VZLvoZHiXn7OKMDymNMzVtav98Kv2TAy7BE9e6z/xf/4eWp7lK7lvvXZtTcj8M3OVfczJc+uddx 9iQ8A X-Developer-Key: i=ljs@kernel.org; a=openpgp; fpr=E7F417BF5214569E89D04F46CF9DCD8A81E27F14 We already have vma_last_pgoff() which retrieves the last page offset within a VMA. However, code often wishes to span a page offset range, which requires the exclusive end of this range. So provide this in vma_end_pgoff() and update vma_last_pgoff() to use this function. Also update the VMA userland tests to reflect the change. No functional change intended. Reviewed-by: Gregory Price Reviewed-by: Pedro Falcato Reviewed-by: Vlastimil Babka (SUSE) Signed-off-by: Lorenzo Stoakes --- include/linux/mm.h | 19 ++++++++++++++++++- tools/testing/vma/include/dup.h | 5 +++++ 2 files changed, 23 insertions(+), 1 deletion(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index abac72785277..c56ca22d406c 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -4331,6 +4331,23 @@ static inline pgoff_t vma_start_pgoff(const struct vm_area_struct *vma) return vma->vm_pgoff; } +/** + * vma_end_pgoff() - Get the page offset of the exclusive end of @vma + * @vma: The VMA whose end page offset is required. + * + * This returns the exclusive end page offset of @vma, which is useful for + * expressing page offset ranges. + * + * See the description of vma_start_pgoff() for a description of VMA page + * offsets. + * + * Returns: The exclusive end page offset of @vma. + */ +static inline pgoff_t vma_end_pgoff(const struct vm_area_struct *vma) +{ + return vma_start_pgoff(vma) + vma_pages(vma); +} + /** * vma_last_pgoff() - Get the page offset of the last page in @vma * @vma: The VMA whose last page offset is required. @@ -4344,7 +4361,7 @@ static inline pgoff_t vma_start_pgoff(const struct vm_area_struct *vma) */ static inline pgoff_t vma_last_pgoff(const struct vm_area_struct *vma) { - return vma_start_pgoff(vma) + vma_pages(vma) - 1; + return vma_end_pgoff(vma) - 1; } static inline unsigned long vma_desc_size(const struct vm_area_desc *desc) diff --git a/tools/testing/vma/include/dup.h b/tools/testing/vma/include/dup.h index 668650067c7c..535747d7fee4 100644 --- a/tools/testing/vma/include/dup.h +++ b/tools/testing/vma/include/dup.h @@ -1306,6 +1306,11 @@ static inline pgoff_t vma_start_pgoff(const struct vm_area_struct *vma) return vma->vm_pgoff; } +static inline pgoff_t vma_end_pgoff(const struct vm_area_struct *vma) +{ + return vma_start_pgoff(vma) + vma_pages(vma); +} + static inline int vfs_mmap_prepare(struct file *file, struct vm_area_desc *desc) { return file->f_op->mmap_prepare(desc); -- 2.55.0