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 8E119C4332F for ; Mon, 7 Feb 2022 19:46:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240351AbiBGTpE (ORCPT ); Mon, 7 Feb 2022 14:45:04 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59214 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239950AbiBGTn3 (ORCPT ); Mon, 7 Feb 2022 14:43:29 -0500 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 81527C0401E2 for ; Mon, 7 Feb 2022 11:43:28 -0800 (PST) From: John Ogness DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1644263006; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=lZJXPJIT5SmBR9g67hmZQXBDjPIFa3gpior2KE3O7e0=; b=CqMCWvWy1KAyyVjByXMA0ujM9u6w+ZCFyMZNSYyn63S7b6CmLL3lXerptxJwIwQZTbKovg QuAo1sucTKPf8QGzb57657VkUKX2u5yCm80bRqBjSMFHyaEfzLi98AtxwiKDpVrQqJM28M hq3eKqj2+wG+VLBzV8Wbq8c7snZ67mVpD+qdlqJgu+8qi703w+0jXkOkiwEz2qSnCmpCDZ vwCahncH456hpG4NNHrcI2Tx+oGT0m/vUPbbQM3cJn2xoTFfqYQ/1hS0IaV+scnW9gyeyM lEXPxg5cJyPtiUFQs32dubWIpXS7Mrc8k+pG3mGrT7aoyaW0ER9ShEZ8UYfEMw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1644263006; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=lZJXPJIT5SmBR9g67hmZQXBDjPIFa3gpior2KE3O7e0=; b=LAPJ8HRccNNN76RivwGemLEwfDBT7AeBoRlGNXX2uuCaUe5FcyV87ss5MklQKiFFO6/pAr df6GOvuLcOvpMPBA== To: Petr Mladek Cc: Sergey Senozhatsky , Steven Rostedt , Thomas Gleixner , linux-kernel@vger.kernel.org Subject: [PATCH printk v1 04/13] printk: get caller_id/timestamp after migration disable Date: Mon, 7 Feb 2022 20:49:14 +0106 Message-Id: <20220207194323.273637-5-john.ogness@linutronix.de> In-Reply-To: <20220207194323.273637-1-john.ogness@linutronix.de> References: <20220207194323.273637-1-john.ogness@linutronix.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Currently the local CPU timestamp and caller_id for the record are collected while migration is enabled. Since this information is CPU-specific, it should be collected with migration disabled. Migration is disabled immediately after collecting this information anyway, so just move the information collection to after the migration disabling. Signed-off-by: John Ogness --- kernel/printk/printk.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index b346e60e9e51..206405f349d0 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -2017,7 +2017,7 @@ static inline void printk_delay(void) static inline u32 printk_caller_id(void) { return in_task() ? task_pid_nr(current) : - 0x80000000 + raw_smp_processor_id(); + 0x80000000 + smp_processor_id(); } /** @@ -2099,7 +2099,6 @@ int vprintk_store(int facility, int level, const struct dev_printk_info *dev_info, const char *fmt, va_list args) { - const u32 caller_id = printk_caller_id(); struct prb_reserved_entry e; enum printk_info_flags flags = 0; struct printk_record r; @@ -2109,10 +2108,14 @@ int vprintk_store(int facility, int level, u8 *recursion_ptr; u16 reserve_size; va_list args2; + u32 caller_id; u16 text_len; int ret = 0; u64 ts_nsec; + if (!printk_enter_irqsave(recursion_ptr, irqflags)) + return 0; + /* * Since the duration of printk() can vary depending on the message * and state of the ringbuffer, grab the timestamp now so that it is @@ -2121,8 +2124,7 @@ int vprintk_store(int facility, int level, */ ts_nsec = local_clock(); - if (!printk_enter_irqsave(recursion_ptr, irqflags)) - return 0; + caller_id = printk_caller_id(); /* * The sprintf needs to come first since the syslog prefix might be -- 2.30.2