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 X-Spam-Level: X-Spam-Status: No, score=-10.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 13B4EC433DB for ; Mon, 1 Feb 2021 10:27:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B341B64E11 for ; Mon, 1 Feb 2021 10:27:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232924AbhBAK13 (ORCPT ); Mon, 1 Feb 2021 05:27:29 -0500 Received: from mx2.suse.de ([195.135.220.15]:35066 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232290AbhBAK12 (ORCPT ); Mon, 1 Feb 2021 05:27:28 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1612175201; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=HcYuIPJxvFYv5QNbcW9iQ1RF+MJphc58zNc70PwN3M8=; b=jroby34NQvFAIo/UBsJqgs/M+jC53xDSbLP2KQhmTBxVauvM9SAQqgZg1LYw6ZKT6YN7qJ hHalDufw6nquiQykcKmNe5uA8la3WK+A5CDO8H41kH3rgWJ3d8aMccUK/bGLxi+mZfh67S GF84pS2gh3z6mIZ+Q145532/rW5pWlw= Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 955B6AFDB; Mon, 1 Feb 2021 10:26:41 +0000 (UTC) Date: Mon, 1 Feb 2021 11:26:41 +0100 From: Petr Mladek To: John Ogness Cc: Sergey Senozhatsky , Sergey Senozhatsky , Steven Rostedt , Thomas Gleixner , linux-kernel@vger.kernel.org Subject: Re: [PATCH printk-rework 09/12] um: synchronize kmsg_dumper Message-ID: References: <20210126211551.26536-1-john.ogness@linutronix.de> <20210126211551.26536-10-john.ogness@linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210126211551.26536-10-john.ogness@linutronix.de> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue 2021-01-26 22:21:48, John Ogness wrote: > In preparation for removing printk's @logbuf_lock, dumpers that have > assumed to be protected against parallel calls must provide their own > synchronization. Add a locally static spinlock to synchronize the > kmsg_dump call and temporary buffer usage. > > Signed-off-by: John Ogness Reviewed-by: Petr Mladek Best Regards, Petr