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 picard.linux.it (picard.linux.it [213.254.12.146]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 59B53C43458 for ; Fri, 10 Jul 2026 06:56:22 +0000 (UTC) Received: from picard.linux.it (localhost [IPv6:::1]) by picard.linux.it (Postfix) with ESMTP id C2A353E26AE for ; Fri, 10 Jul 2026 08:56:20 +0200 (CEST) Received: from in-7.smtp.seeweb.it (in-7.smtp.seeweb.it [IPv6:2001:4b78:1:20::7]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (secp384r1)) (No client certificate requested) by picard.linux.it (Postfix) with ESMTPS id 15C463CD4AD for ; Fri, 10 Jul 2026 08:56:04 +0200 (CEST) Received: from smtp-out1.suse.de (smtp-out1.suse.de [IPv6:2a07:de40:b251:101:10:150:64:1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by in-7.smtp.seeweb.it (Postfix) with ESMTPS id CBAA1200A17 for ; Fri, 10 Jul 2026 08:56:03 +0200 (CEST) Received: from imap1.dmz-prg2.suse.org (imap1.dmz-prg2.suse.org [IPv6:2a07:de40:b281:104:10:150:64:97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by smtp-out1.suse.de (Postfix) with ESMTPS id 9E0B276639; Fri, 10 Jul 2026 06:56:02 +0000 (UTC) Authentication-Results: smtp-out1.suse.de; none Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id 761B3779BD; Fri, 10 Jul 2026 06:56:02 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id lm5hG4KXUGqaCAAAD6G6ig (envelope-from ); Fri, 10 Jul 2026 06:56:02 +0000 Date: Fri, 10 Jul 2026 08:55:56 +0200 From: Petr Vorel To: Cyril Hrubis Message-ID: <20260710065556.GD1138100@pevik> References: <20260709085353.345957-1-chrubis@suse.cz> <20260709085353.345957-6-chrubis@suse.cz> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20260709085353.345957-6-chrubis@suse.cz> X-Rspamd-Pre-Result: action=no action; module=replies; Message is reply to one we originated X-Rspamd-Queue-Id: 9E0B276639 X-Rspamd-Action: no action X-Rspamd-Server: rspamd1.dmz-prg2.suse.org X-Rspamd-Pre-Result: action=no action; module=replies; Message is reply to one we originated X-Spamd-Result: default: False [-4.00 / 50.00]; REPLY(-4.00)[] X-Virus-Scanned: clamav-milter 1.0.9 at in-7.smtp.seeweb.it X-Virus-Status: Clean Subject: Re: [LTP] [PATCH v3 5/9] syscalls: Add epoll_wait10 X-BeenThere: ltp@lists.linux.it X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux Test Project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Petr Vorel Cc: ltp@lists.linux.it Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ltp-bounces+ltp=archiver.kernel.org@lists.linux.it Sender: "ltp" Hi Cyril, > +/*\ > + * Verify that :manpage:epoll_wait() with EPOLLPRI detects changes to > + * /proc/mounts. > + * > + * The kernel generates a poll notification (POLLPRI/EPOLLERR) on > + * /proc/mounts whenever the mount namespace changes. This test verifies > + * that epoll can observe these notifications. > + * > + * [Algorithm] > + * > + * - Open /proc/mounts and register it with an epoll instance for EPOLLPRI. > + * - Fork a child that mounts and then unmounts a tmpfs filesystem, using > + * checkpoints to synchronize with the parent. > + * - After each mount namespace change the parent calls epoll_wait and verifies > + * it returns an event. > + * > + * Needs root to call mount/umount. > + */ Nice test, thanks for the description. Reviewed-by: Petr Vorel ... > +static struct tst_test test = { > + .test_all = run, > + .setup = setup, > + .cleanup = cleanup, > + .needs_root = 1, > + .forks_child = 1, > + .needs_checkpoints = 1, > + .needs_tmpdir = 1, Shouldn't we have .needs_kconfigs CONFIG_TMPFS=y I know it's really a corner case when somebody disable it. Kind regards, Petr -- Mailing list info: https://lists.linux.it/listinfo/ltp