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=-5.2 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 E52F3C7618B for ; Fri, 26 Jul 2019 07:04:42 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id BF3172189F for ; Fri, 26 Jul 2019 07:04:42 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="UYqOhI97"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="hj2bqG3O" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BF3172189F Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=3yPvyyfFTqC1G++SVDCuCavh2umRvbRiCP3Ahx489Ek=; b=UYqOhI97BmfZ/y fmw5sGFRj344FEFb4JdDDT+hgP7HGYA/NLj/VoCJqGKrgWfl9TUpQFhPCgP6PoHGHyEBVX0O43Ezt T5LhGpAjedOhDbFzIP3GFf+kzw96JlQhSlhNIIDQINhXlfGSjK4gkk82VXhF8gJwf3U2rlb96N61C QiYmwnbMZF5sLWgrR8cFHIf2ICvJILlgFMOMmXde4X6gEuiDRC4XPsMHsp7CjC6yQgABsLeYpn2Mu T8RE5FmIJvRqndm0zpGOhwuZ8q/vkOAZEsLq3QYTUPGoC9jtJefMPdM+2KgIN3lAeRgcONu3jx0lg miVsaQBFMPnJDTe+yIFw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hquHL-0001an-BH; Fri, 26 Jul 2019 07:04:35 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1hquHI-0001aH-OD for linux-arm-kernel@lists.infradead.org; Fri, 26 Jul 2019 07:04:34 +0000 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 9B33C2189F; Fri, 26 Jul 2019 07:04:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1564124672; bh=k/UOBs057nzqvM8wDXVsdhD34rUb8UosI2e9mYaPZcc=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=hj2bqG3OC26tesrJHal/PYw3vjXJCXPcVlmZ/mvwcK60gprjxKzanyetOieQalQtC /Az1cdpFMBj1pj7fD6vzLZAQk3QkKKBYhyCBP0bowOvh4Z2hvHgTjIArDV9mZEW1at xZaN09LLnZSxwlkmcNlcEhZwoiJWK9WeJZ3uacKE= Date: Fri, 26 Jul 2019 09:04:29 +0200 From: Greg Kroah-Hartman To: Sai Prakash Ranjan Subject: Re: [Regression] Missing device nodes for ETR, ETF and STM after CONFIG_UEVENT_HELPER=n Message-ID: <20190726070429.GA15714@kroah.com> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.12.1 (2019-06-15) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190726_000432_807511_46C8B21B X-CRM114-Status: GOOD ( 16.44 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Geert Uytterhoeven , Mathieu Poirier , Suzuki K Poulose , linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, Leo Yan , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Jul 26, 2019 at 11:49:19AM +0530, Sai Prakash Ranjan wrote: > Hi, > > When trying to test my coresight patches, I found that etr,etf and stm > device nodes are missing from /dev. I have no idea what those device nodes are. > Bisection gives this as the bad commit. > > 1be01d4a57142ded23bdb9e0c8d9369e693b26cc is the first bad commit > commit 1be01d4a57142ded23bdb9e0c8d9369e693b26cc > Author: Geert Uytterhoeven > Date: Thu Mar 14 12:13:50 2019 +0100 > > driver: base: Disable CONFIG_UEVENT_HELPER by default > > Since commit 7934779a69f1184f ("Driver-Core: disable /sbin/hotplug by > default"), the help text for the /sbin/hotplug fork-bomb says > "This should not be used today [...] creates a high system load, or > [...] out-of-memory situations during bootup". The rationale for this > was that no recent mainstream system used this anymore (in 2010!). > > A few years later, the complete uevent helper support was made optional > in commit 86d56134f1b67d0c ("kobject: Make support for uevent_helper > optional."). However, if was still left enabled by default, to support > ancient userland. > > Time passed by, and nothing should use this anymore, so it can be > disabled by default. > > Signed-off-by: Geert Uytterhoeven > Signed-off-by: Greg Kroah-Hartman > > drivers/base/Kconfig | 1 - > 1 file changed, 1 deletion(-) > > > Any idea on this? That means that who ever created those device nodes is relying on udev to do this, and is not doing the correct thing within the kernel and using devtmpfs. Any pointers to where in the kernel those devices are trying to be created? thanks, greg k-h _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel