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=-3.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no 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 900B7C2D0EA for ; Wed, 8 Apr 2020 15:19:53 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (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 3F5FC206C0 for ; Wed, 8 Apr 2020 15:19:53 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="L32SowMk" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3F5FC206C0 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 48y7HV4xXnzDr4r for ; Thu, 9 Apr 2020 01:19:50 +1000 (AEST) Authentication-Results: lists.ozlabs.org; spf=none (no SPF record) smtp.mailfrom=infradead.org (client-ip=2607:7c80:54:e::133; helo=bombadil.infradead.org; envelope-from=willy@infradead.org; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=infradead.org header.i=@infradead.org header.a=rsa-sha256 header.s=bombadil.20170209 header.b=L32SowMk; dkim-atps=neutral Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 48y7BZ4GzhzDqHR for ; Thu, 9 Apr 2020 01:15:34 +1000 (AEST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=5Zyr+e9ojNxPf0UJbZ9u+v/X52sgt1i2sd8hmR6F47U=; b=L32SowMkDY1Nvkk1P+JH95Mz1a GuD4zRqv2dPCcJVwSn1QwymJ24KIDAK1RGhAyV/QQ+p2QbBtRHvi/a1FYE3qfogJFrnBZkDlThFzK IqCB93D/bsMtpUeC4hD3PyzdzrsUqcglZldNwu/V0g0eR8ChVF9oZFNzWsry73hFTny3aFVqoOety mJ0SNj2FV0h0akd26thCyTTJlDnP3cVMyV9RDiMHzwxr89F3pcghAW072S9K43a3CAhduPy/Qqxhj 9VZc0gmBwmCxm9pi6xN0ggQWrzvceGDE2Tt7CjnyWIReAaTLibi/4WD/2QFbaSK0YWgfUD4jZuoHs 1qhQI+Mw==; Received: from willy by bombadil.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1jMCQB-0000vd-W6; Wed, 08 Apr 2020 15:15:19 +0000 Date: Wed, 8 Apr 2020 08:15:19 -0700 From: Matthew Wilcox To: Peter Zijlstra Subject: Re: [PATCH 10/28] mm: only allow page table mappings for built-in zsmalloc Message-ID: <20200408151519.GQ21484@bombadil.infradead.org> References: <20200408115926.1467567-1-hch@lst.de> <20200408115926.1467567-11-hch@lst.de> <20200408151203.GN20730@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200408151203.GN20730@hirez.programming.kicks-ass.net> X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-hyperv@vger.kernel.org, David Airlie , dri-devel@lists.freedesktop.org, linux-mm@kvack.org, "K. Y. Srinivasan" , Sumit Semwal , linux-arch@vger.kernel.org, linux-s390@vger.kernel.org, Wei Liu , Stephen Hemminger , x86@kernel.org, Christoph Hellwig , Laura Abbott , Nitin Gupta , Daniel Vetter , Haiyang Zhang , linaro-mm-sig@lists.linaro.org, bpf@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Robin Murphy , Randy Dunlap , linux-kernel@vger.kernel.org, Minchan Kim , iommu@lists.linux-foundation.org, Sakari Ailus , Andrew Morton , linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Wed, Apr 08, 2020 at 05:12:03PM +0200, Peter Zijlstra wrote: > On Wed, Apr 08, 2020 at 08:01:00AM -0700, Randy Dunlap wrote: > > Hi, > > > > On 4/8/20 4:59 AM, Christoph Hellwig wrote: > > > diff --git a/mm/Kconfig b/mm/Kconfig > > > index 36949a9425b8..614cc786b519 100644 > > > --- a/mm/Kconfig > > > +++ b/mm/Kconfig > > > @@ -702,7 +702,7 @@ config ZSMALLOC > > > > > > config ZSMALLOC_PGTABLE_MAPPING > > > bool "Use page table mapping to access object in zsmalloc" > > > - depends on ZSMALLOC > > > + depends on ZSMALLOC=y > > > > It's a bool so this shouldn't matter... not needed. > > My mm/Kconfig has: > > config ZSMALLOC > tristate "Memory allocator for compressed pages" > depends on MMU > > which I think means it can be modular, no? Randy means that ZSMALLOC_PGTABLE_MAPPING is a bool, so I think hch's patch is wrong ... if ZSMALLOC is 'm' then ZSMALLOC_PGTABLE_MAPPING would become 'n' instead of 'y'.