Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758198AbdHYTKp (ORCPT ); Fri, 25 Aug 2017 15:10:45 -0400 Received: from mx1.redhat.com ([209.132.183.28]:41376 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758171AbdHYTKO (ORCPT ); Fri, 25 Aug 2017 15:10:14 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 7DDBC7E445 Authentication-Results: ext-mx03.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx03.extmail.prod.ext.phx2.redhat.com; spf=fail smtp.mailfrom=joe.lawrence@redhat.com From: Joe Lawrence To: live-patching@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Josh Poimboeuf , Jessica Yu , Jiri Kosina , Miroslav Benes , Petr Mladek , Chris J Arges Subject: [PATCH v4 3/3] livepatch: add transition notices Date: Fri, 25 Aug 2017 15:10:02 -0400 Message-Id: <1503688202-12121-4-git-send-email-joe.lawrence@redhat.com> In-Reply-To: <1503688202-12121-1-git-send-email-joe.lawrence@redhat.com> References: <1503688202-12121-1-git-send-email-joe.lawrence@redhat.com> X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.27]); Fri, 25 Aug 2017 19:10:13 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2432 Lines: 76 Log a few kernel debug messages at the beginning of the following livepatch transition functions: klp_complete_transition() klp_cancel_transition() klp_init_transition() klp_reverse_transition() Also update the log notice message in klp_start_transition() for similar verbiage as the above messages. Signed-off-by: Joe Lawrence Suggested-by: Josh Poimboeuf --- kernel/livepatch/transition.c | 18 +++++++++++++++++- 1 file changed, 17 insertions(+), 1 deletion(-) diff --git a/kernel/livepatch/transition.c b/kernel/livepatch/transition.c index 53887f0bca10..3d44a3cf27be 100644 --- a/kernel/livepatch/transition.c +++ b/kernel/livepatch/transition.c @@ -82,6 +82,10 @@ static void klp_complete_transition(void) unsigned int cpu; bool immediate_func = false; + pr_debug("'%s': completing %s transition\n", + klp_transition_patch->mod->name, + klp_target_state == KLP_PATCHED ? "patching" : "unpatching"); + if (klp_target_state == KLP_UNPATCHED) { /* * All tasks have transitioned to KLP_UNPATCHED so we can now @@ -163,6 +167,9 @@ void klp_cancel_transition(void) if (WARN_ON_ONCE(klp_target_state != KLP_PATCHED)) return; + pr_debug("'%s': canceling transition, unpatching\n", + klp_transition_patch->mod->name); + klp_target_state = KLP_UNPATCHED; klp_complete_transition(); } @@ -441,7 +448,8 @@ void klp_start_transition(void) WARN_ON_ONCE(klp_target_state == KLP_UNDEFINED); - pr_notice("'%s': %s...\n", klp_transition_patch->mod->name, + pr_notice("'%s': starting %s transition\n", + klp_transition_patch->mod->name, klp_target_state == KLP_PATCHED ? "patching" : "unpatching"); /* @@ -489,6 +497,9 @@ void klp_init_transition(struct klp_patch *patch, int state) WARN_ON_ONCE(klp_target_state != KLP_UNDEFINED); + pr_debug("'%s': initializing %s transition\n", patch->mod->name, + klp_target_state == KLP_PATCHED ? "patching" : "unpatching"); + klp_transition_patch = patch; /* @@ -562,6 +573,11 @@ void klp_reverse_transition(void) unsigned int cpu; struct task_struct *g, *task; + pr_debug("'%s': reversing transition from %s\n", + klp_transition_patch->mod->name, + klp_target_state == KLP_PATCHED ? "patching to unpatching" : + "unpatching to patching"); + klp_transition_patch->enabled = !klp_transition_patch->enabled; klp_target_state = !klp_target_state; -- 1.8.3.1