From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id AAF25CD3425 for ; Tue, 19 Sep 2023 00:23:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230295AbjISAXM (ORCPT ); Mon, 18 Sep 2023 20:23:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47070 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229508AbjISAXL (ORCPT ); Mon, 18 Sep 2023 20:23:11 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 98E7F8E for ; Mon, 18 Sep 2023 17:23:05 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A9C0CC433C8; Tue, 19 Sep 2023 00:23:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1695082984; bh=zEYGGEoSSPAMeR6wvmK9u92UrFfeYWlh+5S63sjoqI4=; h=Date:To:From:Subject:From; b=HjCORIxbG9cm+/09uteb2g7J4AX48E7fB6DijQHRnkdQiAI+XDD1O63PRvEkJGbr1 ZrSv5GS2+KdoPuHh5b5GkmG/frB9+qfAhwjqbxr4HO6Tu8+cbkfxJMQaRzKxwyKVww Hbn3ZXrDr29ASmTFroEkSu3YlPaQ8Ln941yFyiFc= Date: Mon, 18 Sep 2023 17:23:03 -0700 To: mm-commits@vger.kernel.org, jgg@nvidia.com, apopple@nvidia.com, jannh@google.com, akpm@linux-foundation.org From: Andrew Morton Subject: + mm-document-mmu_notifier_invalidate_range_start_nonblock.patch added to mm-unstable branch Message-Id: <20230919002304.A9C0CC433C8@smtp.kernel.org> Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org The patch titled Subject: mm: document mmu_notifier_invalidate_range_start_nonblock() has been added to the -mm mm-unstable branch. Its filename is mm-document-mmu_notifier_invalidate_range_start_nonblock.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-document-mmu_notifier_invalidate_range_start_nonblock.patch This patch will later appear in the mm-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm 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 the mm-everything branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there every 2-3 working days ------------------------------------------------------ From: Jann Horn Subject: mm: document mmu_notifier_invalidate_range_start_nonblock() Date: Mon, 18 Sep 2023 22:18:32 +0200 Document what mmu_notifier_invalidate_range_start_nonblock() is for. Also add a __must_check annotation to signal that callers must bail out if a notifier vetoes the operation. Link: https://lkml.kernel.org/r/20230918201832.265108-1-jannh@google.com Signed-off-by: Jann Horn Reviewed-by: Jason Gunthorpe Reviewed-by: Alistair Popple Signed-off-by: Andrew Morton --- include/linux/mmu_notifier.h | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) --- a/include/linux/mmu_notifier.h~mm-document-mmu_notifier_invalidate_range_start_nonblock +++ a/include/linux/mmu_notifier.h @@ -459,7 +459,14 @@ mmu_notifier_invalidate_range_start(stru lock_map_release(&__mmu_notifier_invalidate_range_start_map); } -static inline int +/* + * This version of mmu_notifier_invalidate_range_start() avoids blocking, but it + * can return an error if a notifier can't proceed without blocking, in which + * case you're not allowed to modify PTEs in the specified range. + * + * This is mainly intended for OOM handling. + */ +static inline int __must_check mmu_notifier_invalidate_range_start_nonblock(struct mmu_notifier_range *range) { int ret = 0; _ Patches currently in -mm which might be from jannh@google.com are mm-document-mmu_notifier_invalidate_range_start_nonblock.patch