From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lf0-f69.google.com (mail-lf0-f69.google.com [209.85.215.69]) by kanga.kvack.org (Postfix) with ESMTP id 7D4706B0260 for ; Wed, 19 Oct 2016 15:43:46 -0400 (EDT) Received: by mail-lf0-f69.google.com with SMTP id b81so15598934lfe.1 for ; Wed, 19 Oct 2016 12:43:46 -0700 (PDT) Received: from fireflyinternet.com (mail.fireflyinternet.com. [109.228.58.192]) by mx.google.com with ESMTPS id yh8si28711775wjb.272.2016.10.19.12.43.44 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 19 Oct 2016 12:43:44 -0700 (PDT) Date: Wed, 19 Oct 2016 20:43:33 +0100 From: Chris Wilson Subject: Re: [PATCH 2/6] mm: mark all calls into the vmalloc subsystem as potentially sleeping Message-ID: <20161019194333.GD19173@nuc-i3427.alporthouse.com> References: <1476773771-11470-1-git-send-email-hch@lst.de> <1476773771-11470-3-git-send-email-hch@lst.de> <20161019111541.GQ29358@nuc-i3427.alporthouse.com> <20161019130552.GB5876@lst.de> <20161019163112.GA31091@lst.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20161019163112.GA31091@lst.de> Sender: owner-linux-mm@kvack.org List-ID: To: Christoph Hellwig Cc: Andy Lutomirski , Andrew Morton , joelaf@google.com, jszhang@marvell.com, joaodias@google.com, "linux-mm@kvack.org" , linux-rt-users@vger.kernel.org, "linux-kernel@vger.kernel.org" On Wed, Oct 19, 2016 at 06:31:12PM +0200, Christoph Hellwig wrote: > On Wed, Oct 19, 2016 at 08:34:40AM -0700, Andy Lutomirski wrote: > > > > It would be quite awkward for a task stack to get freed from a > > sleepable context, because the obvious sleepable context is the task > > itself, and it still needs its stack. This was true even in the old > > regime when task stacks were freed from RCU context. > > > > But vfree has a magic automatic deferral mechanism. Couldn't you make > > the non-deferred case might_sleep()? > > But it's only magic from interrupt context.. > > Chris, does this patch make virtually mapped stack work for you again? So far, so good. No warns from anyone else. -Chris -- Chris Wilson, Intel Open Source Technology Centre -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org