From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Guilherme G. Piccoli" Subject: [PATCH 14/30] panic: Properly identify the panic event to the notifiers' callbacks Date: Wed, 27 Apr 2022 19:49:08 -0300 Message-ID: <20220427224924.592546-15-gpiccoli@igalia.com> References: <20220427224924.592546-1-gpiccoli@igalia.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=4xxU1ct6EY0yT6BjAkP3bi4qTmhWag2Ix2EsvqSo4vI=; b=AYs+UD4ZljWKjh 8fuqkINgKlFnlMQBiPBrf82I5Sny//Dc2gmet6N24/LO8lllZ2UpfZTHznI0SJxmCbI+OPW6AMN4E MU4I5srpowrmhjg1w6XOUycNPKnaNXueQS60tAi332XxJyTG0aXm4SpqEriebwY1JZp/vv7gb7t+u SKCQrvujlNY4ujTtere7YQeVKAr8ojgySDeZZFIlpE6TAwLxTBBcQiTSmxKJWnyIodyuTXnh91Kt3 aOuQOXaghExm3p4VR7hHMHjVKUvtKsiZZ4B5yircs8DjU2A2rm4rC1QvzFXCCixOj8RTSGuo9nRve 78lU57GQs7nDRNArfALw==; DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=igalia.com; s=20170329; h=Content-Transfer-Encoding:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To:Content-Type:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=mOzFWStqo1l1SFAwioSEW9cov+DtDc5WSMbZaYL5OFk=; b=jORyziNh7Mp7CJnb2ldBvIVUYT miqK/KwxTCDE0PrnGOVoO5V4xtjW+TEXZOKHxzyxZAzEuCslLE//gxMpeQbei+ydr8zg3pnWZUWxE L40pn68w+NUbAHLuqvLt2UI0hgcbpQZODu83KlzMI8qRKWoyX30oYob/b9pQLrf+6HFREi99ePbwb zW4TblodvYrIgJCYkkWUlwk3Cl/V3uSBOUWLD/GIZmkaB62kyu6wuslAaH0LxO2Qqyrw8rvwJQSXp vohmbyikfHUVSRBgOx4Bv9HUeJbAvmB/X4rw1kDURxjWp8eCgUztnLBZm1GN+7lilt+TPvGD7Gymp FQwd7uqA==; In-Reply-To: <20220427224924.592546-1-gpiccoli@igalia.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-um" Errors-To: linux-um-bounces+glud-user-mode-linux-devel=m.gmane-mx.org@lists.infradead.org To: akpm@linux-foundation.org, bhe@redhat.com, pmladek@suse.com, kexec@lists.infradead.org Cc: linux-kernel@vger.kernel.org, bcm-kernel-feedback-list@broadcom.com, coresight@lists.linaro.org, linuxppc-dev@lists.ozlabs.org, linux-alpha@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-edac@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-leds@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linux-pm@vger.kernel.org, linux-remoteproc@vger.kernel.org, linux-s390@vger.kernel.org, linux-tegra@vger.kernel.org, linux-um@lists.infradead.org, linux-xtensa@linux-xtensa.org, netdev@vger.kernel.org, openipmi-developer@lists.sourceforge.net, rcu@vger.kernel.org, sparclinux@vger.kernel.org, xen-devel@lists.xenproject.org, x86@kernel.org, kernel-dev@igalia.com, gpiccoli@igalia.com, kernel@gpiccoli.net, halves@canonical.com, fabiomirmar@gmail.com, alejandro.j.jimenez@oracle.com, andriy.shevchenko@linux.intel.com, arnd@arndb.de, bp@alien8. The notifiers infrastructure provides a way to pass an "id" to the callbacks to determine what kind of event happened, i.e., what is the reason behind they getting called. The panic notifier currently pass 0, but this is soon to be used in a multi-targeted notifier, so let's pass a meaningful "id" over there. Signed-off-by: Guilherme G. Piccoli --- include/linux/panic_notifier.h | 5 +++++ kernel/panic.c | 2 +- 2 files changed, 6 insertions(+), 1 deletion(-) diff --git a/include/linux/panic_notifier.h b/include/linux/panic_notifier.h index 41e32483d7a7..07dced83a783 100644 --- a/include/linux/panic_notifier.h +++ b/include/linux/panic_notifier.h @@ -9,4 +9,9 @@ extern struct atomic_notifier_head panic_notifier_list; extern bool crash_kexec_post_notifiers; +enum panic_notifier_val { + PANIC_UNUSED, + PANIC_NOTIFIER = 0xDEAD, +}; + #endif /* _LINUX_PANIC_NOTIFIERS_H */ diff --git a/kernel/panic.c b/kernel/panic.c index eb4dfb932c85..523bc9ccd0e9 100644 --- a/kernel/panic.c +++ b/kernel/panic.c @@ -287,7 +287,7 @@ void panic(const char *fmt, ...) * Run any panic handlers, including those that might need to * add information to the kmsg dump output. */ - atomic_notifier_call_chain(&panic_notifier_list, 0, buf); + atomic_notifier_call_chain(&panic_notifier_list, PANIC_NOTIFIER, buf); panic_print_sys_info(false); -- 2.36.0