From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753519AbdASPsT (ORCPT ); Thu, 19 Jan 2017 10:48:19 -0500 Received: from mx1.redhat.com ([209.132.183.28]:33158 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753502AbdASPsR (ORCPT ); Thu, 19 Jan 2017 10:48:17 -0500 From: Josh Poimboeuf To: Jessica Yu , Jiri Kosina , Miroslav Benes , Petr Mladek Cc: linux-kernel@vger.kernel.org, live-patching@vger.kernel.org, Michael Ellerman , Heiko Carstens , x86@kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, Vojtech Pavlik , Jiri Slaby , Chris J Arges , Andy Lutomirski , Ingo Molnar , Peter Zijlstra , Kamalesh Babulal , Balbir Singh Subject: [PATCH v4 14/15] livepatch: add /proc//patch_state Date: Thu, 19 Jan 2017 09:46:22 -0600 Message-Id: <2c3b793fc23910f8fe15033b2b35e53b0b5dbaf3.1484839971.git.jpoimboe@redhat.com> In-Reply-To: References: X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.31]); Thu, 19 Jan 2017 15:48:12 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Expose the per-task patch state value so users can determine which tasks are holding up completion of a patching operation. Signed-off-by: Josh Poimboeuf Reviewed-by: Petr Mladek Reviewed-by: Miroslav Benes --- Documentation/filesystems/proc.txt | 18 ++++++++++++++++++ fs/proc/base.c | 15 +++++++++++++++ 2 files changed, 33 insertions(+) diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt index 72624a1..85c501b 100644 --- a/Documentation/filesystems/proc.txt +++ b/Documentation/filesystems/proc.txt @@ -44,6 +44,7 @@ Table of Contents 3.8 /proc//fdinfo/ - Information about opened file 3.9 /proc//map_files - Information about memory mapped files 3.10 /proc//timerslack_ns - Task timerslack value + 3.11 /proc//patch_state - Livepatch patch operation state 4 Configuring procfs 4.1 Mount options @@ -1886,6 +1887,23 @@ Valid values are from 0 - ULLONG_MAX An application setting the value must have PTRACE_MODE_ATTACH_FSCREDS level permissions on the task specified to change its timerslack_ns value. +3.11 /proc//patch_state - Livepatch patch operation state +----------------------------------------------------------------- +When CONFIG_LIVEPATCH is enabled, this file displays the value of the +patch state for the task. + +A value of '-1' indicates that no patch is in transition. + +A value of '0' indicates that a patch is in transition and the task is +unpatched. If the patch is being enabled, then the task hasn't been +patched yet. If the patch is being disabled, then the task has already +been unpatched. + +A value of '1' indicates that a patch is in transition and the task is +patched. If the patch is being enabled, then the task has already been +patched. If the patch is being disabled, then the task hasn't been +unpatched yet. + ------------------------------------------------------------------------------ Configuring procfs diff --git a/fs/proc/base.c b/fs/proc/base.c index 16ed964..6d773be 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -2797,6 +2797,15 @@ static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns, return err; } +#ifdef CONFIG_LIVEPATCH +static int proc_pid_patch_state(struct seq_file *m, struct pid_namespace *ns, + struct pid *pid, struct task_struct *task) +{ + seq_printf(m, "%d\n", task->patch_state); + return 0; +} +#endif /* CONFIG_LIVEPATCH */ + /* * Thread groups */ @@ -2896,6 +2905,9 @@ static const struct pid_entry tgid_base_stuff[] = { REG("timers", S_IRUGO, proc_timers_operations), #endif REG("timerslack_ns", S_IRUGO|S_IWUGO, proc_pid_set_timerslack_ns_operations), +#ifdef CONFIG_LIVEPATCH + ONE("patch_state", S_IRUSR, proc_pid_patch_state), +#endif }; static int proc_tgid_base_readdir(struct file *file, struct dir_context *ctx) @@ -3276,6 +3288,9 @@ static const struct pid_entry tid_base_stuff[] = { REG("projid_map", S_IRUGO|S_IWUSR, proc_projid_map_operations), REG("setgroups", S_IRUGO|S_IWUSR, proc_setgroups_operations), #endif +#ifdef CONFIG_LIVEPATCH + ONE("patch_state", S_IRUSR, proc_pid_patch_state), +#endif }; static int proc_tid_base_readdir(struct file *file, struct dir_context *ctx) -- 2.7.4