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 E18FE3F12E0 for ; Sat, 12 Sep 2026 07:25:04 +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=1789197906; cv=none; b=fMB3dFIyfxTU4AUBJo3U6ONpZ7Y793qNwgqukpZDLdk3zww7FIFgh06wccBp/mXeJxaYOtZEDOQvlZ2ofixxJV9ADI2Kpi2m5ASwyjykSp1wItSdhEJKqiQmOw8zMgj/shVaZq8rjRCIOmHioph1lxqYw02tR6p8crJ82T4/IWQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789197906; c=relaxed/simple; bh=gnErMsOWMKwATYEhRxsts45CKKZczQvoSbpo/2T6pXg=; h=Date:To:From:Subject:Message-Id; b=PBnC9SyY1HRn7cQpWsykfRDU7oEaQkrXd9OBo7Ew5y5H7FCqeZSaRTkywaIPXoAC5FQt87Bv/28ZhCAcLt271n+5CvQP0nZdAotFuRdl6+cb0xIYTlgXsdsQEx7lObmpWGSM2mlsUZGmEtphE8Jpjb3cSPx9vkel7Tf+f0jdk1o= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=MXTwxDjc; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="MXTwxDjc" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9C1AB1F000FF; Sat, 12 Sep 2026 07:25:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1789197904; bh=y/cPXh6Ql1txWAUBliZ9KsK4JWtag3s5iIM5oYwKbpM=; h=Date:To:From:Subject; b=MXTwxDjcUveKibGzHr5NWc+F8UWsilOEJEqGIJYqlQUZtvbAUvHboc7TzfJymwRjr Gj/aKlOZOj+1HerbhGwG5DQCoXN+OOnwbOW5+b3WbdKTWQ/OR7DS4sx7hOkCG/IpJW AcYEPVRVJtDW3PULPxsITnIvKxXNMCPswYNoAPwc= Date: Sat, 12 Sep 2026 00:25:04 -0700 To: mm-commits@vger.kernel.org,willy@infradead.org,vbabka@kernel.org,usama.arif@linux.dev,pfalcato@suse.de,paulmck@kernel.org,ljs@kernel.org,liam@infradead.org,jannh@google.com,david@kernel.org,surenb@google.com,akpm@linux-foundation.org From: Andrew Morton Subject: + proc-task_mmu-change-proc_get_vma-to-stop-returning-gate-vma-at-the-end.patch added to mm-new branch Message-Id: <20260912072504.9C1AB1F000FF@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: proc/task_mmu: change proc_get_vma() to stop returning gate VMA at the end has been added to the -mm mm-new branch. Its filename is proc-task_mmu-change-proc_get_vma-to-stop-returning-gate-vma-at-the-end.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/proc-task_mmu-change-proc_get_vma-to-stop-returning-gate-vma-at-the-end.patch This patch will later appear in the mm-new branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Note, mm-new is a provisional staging ground for work-in-progress patches, and acceptance into mm-new is a notification for others take notice and to finish up reviews. Please do not hesitate to respond to review feedback and post updated versions to replace or incrementally fixup patches in mm-new. The mm-new branch of mm.git is not included in linux-next If a few days of testing in mm-new is successful, the patch will me moved into mm.git's mm-unstable branch, which is included in linux-next Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via various branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there most days ------------------------------------------------------ From: Suren Baghdasaryan Subject: proc/task_mmu: change proc_get_vma() to stop returning gate VMA at the end Date: Fri, 11 Sep 2026 12:41:43 -0700 proc_get_vma() returning gate VMA at the end is desirable for the its current m_start/m_next callers, as they need to report a gate VMA at the end of the address space. This behavior is very specific to these callers and makes proc_get_vma() hard to use for other purposes. Move this usage-specific behavior into the callers themselves so that proc_get_vma() returns either a valid VMA, an error or a NULL when no more VMAs are available. This makes it more generic, simpler and usable in the later patches. Link: https://lore.kernel.org/20260911194145.1781926-6-surenb@google.com Signed-off-by: Suren Baghdasaryan Signed-off-by: Andrew Morton Reviewed-by: Lorenzo Stoakes (ARM) Acked-by: David Hildenbrand (Arm) Cc: Jann Horn Cc: Liam R. Howlett Cc: Matthew Wilcox (Oracle) Cc: "Paul E . McKenney" Cc: Pedro Falcato Cc: Usama Arif Cc: Vlastimil Babka --- fs/proc/task_mmu.c | 28 +++++++++++++++++++++++----- 1 file changed, 23 insertions(+), 5 deletions(-) --- a/fs/proc/task_mmu.c~proc-task_mmu-change-proc_get_vma-to-stop-returning-gate-vma-at-the-end +++ a/fs/proc/task_mmu.c @@ -236,9 +236,6 @@ retry: * found the extended vma with the same vm_start. */ *ppos = vma->vm_end; - } else { - *ppos = SENTINEL_VMA_GATE; - vma = get_gate_vma(priv->lock_ctx.mm); } return vma; @@ -248,6 +245,7 @@ static void *m_start(struct seq_file *m, { struct proc_maps_private *priv = m->private; struct proc_maps_locking_ctx *lock_ctx; + struct vm_area_struct *vma; loff_t last_addr = *ppos; struct mm_struct *mm; @@ -277,19 +275,39 @@ static void *m_start(struct seq_file *m, *ppos = last_addr = priv->last_pos; vma_iter_init(&priv->iter, mm, (unsigned long)last_addr); hold_task_mempolicy(priv); + /* + * If seq_file had to flush its collected data right after m_next() set + * position to SENTINEL_VMA_GATE, m_start() will get that sentinel and + * should return gate_vma without calling proc_get_vma(). + */ if (last_addr == SENTINEL_VMA_GATE) return get_gate_vma(mm); - return proc_get_vma(m, ppos); + vma = proc_get_vma(m, ppos); + if (vma) + return vma; + + /* Return gate VMA at the end */ + *ppos = SENTINEL_VMA_GATE; + return get_gate_vma(mm); } static void *m_next(struct seq_file *m, void *v, loff_t *ppos) { + struct proc_maps_private *priv = m->private; + struct vm_area_struct *vma; + if (*ppos == SENTINEL_VMA_GATE) { *ppos = SENTINEL_VMA_END; return NULL; } - return proc_get_vma(m, ppos); + vma = proc_get_vma(m, ppos); + if (vma) + return vma; + + /* Return gate VMA at the end */ + *ppos = SENTINEL_VMA_GATE; + return get_gate_vma(priv->lock_ctx.mm); } static void m_stop(struct seq_file *m, void *v) _ Patches currently in -mm which might be from surenb@google.com are proc-task_mmu-remove-unnecessary-helpers.patch proc-task_mmu-remove-unnecessary-inlines-in-function-definitions.patch proc-task_mmu-clarify-shmem-mapping-walk-conditions-in-smap_gather_stats.patch proc-task_mmu-remove-special-casing-of-smap_gather_stats-start-parameter.patch proc-task_mmu-change-proc_get_vma-to-stop-returning-gate-vma-at-the-end.patch proc-task_mmu-read-proc-pid-smaps_rollup-under-per-vma-lock.patch selftests-proc-add-proc-pid-smaps_rollup-tearing-tests.patch