Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932698AbbLGT35 (ORCPT ); Mon, 7 Dec 2015 14:29:57 -0500 Received: from shards.monkeyblade.net ([149.20.54.216]:48111 "EHLO shards.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932328AbbLGT34 (ORCPT ); Mon, 7 Dec 2015 14:29:56 -0500 Date: Mon, 07 Dec 2015 14:29:53 -0500 (EST) Message-Id: <20151207.142953.387889541116696974.davem@davemloft.net> To: tgraf@suug.ch Cc: herbert@gondor.apana.org.au, phil@nwl.cc, eric.dumazet@gmail.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, fengguang.wu@intel.com, wfg@linux.intel.com, lkp@01.org Subject: Re: rhashtable: Use __vmalloc with GFP_ATOMIC for table allocation From: David Miller In-Reply-To: <20151207153524.GA22032@pox.localdomain> References: <20151204181555.GC29598@orbit.nwl.cc> <20151205070603.GB23255@gondor.apana.org.au> <20151207153524.GA22032@pox.localdomain> X-Mailer: Mew version 6.6 on Emacs 24.5 / Mule 6.0 (HANACHIRUSATO) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.5.12 (shards.monkeyblade.net [149.20.54.216]); Mon, 07 Dec 2015 11:29:55 -0800 (PST) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 516 Lines: 12 From: Thomas Graf Date: Mon, 7 Dec 2015 16:35:24 +0100 > Did you look into what __vmalloc prevents to work with BH disabled? You can't issue the cross-cpu TLB flushes from atomic contexts. It's the kernel page table updates that create the restriction. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/