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=-8.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=unavailable 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 D8316C43331 for ; Thu, 26 Mar 2020 12:38:33 +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 54C6620409 for ; Thu, 26 Mar 2020 12:38:33 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 54C6620409 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ellerman.id.au 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 48p4KM1xXzzDqw0 for ; Thu, 26 Mar 2020 23:38:31 +1100 (AEDT) Received: from ozlabs.org (bilbo.ozlabs.org [203.11.71.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 48p3cf2wKszDqpL for ; Thu, 26 Mar 2020 23:06:42 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=ellerman.id.au Received: by ozlabs.org (Postfix, from userid 1034) id 48p3cd3rbBz9sRY; Thu, 26 Mar 2020 23:06:41 +1100 (AEDT) X-powerpc-patch-notification: thanks X-powerpc-patch-commit: 697ece78f8f749aeea40f2711389901f0974017a In-Reply-To: To: Christophe Leroy , Benjamin Herrenschmidt , Paul Mackerras From: Michael Ellerman Subject: Re: [PATCH v3] powerpc/32s: reorder Linux PTE bits to better match Hash PTE bits. Message-Id: <48p3cd3rbBz9sRY@ozlabs.org> Date: Thu, 26 Mar 2020 23:06:41 +1100 (AEDT) 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: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Tue, 2020-03-10 at 17:29:12 UTC, Christophe Leroy wrote: > Reorder Linux PTE bits to (almost) match Hash PTE bits. > > RW Kernel : PP = 00 > RO Kernel : PP = 00 > RW User : PP = 01 > RO User : PP = 11 > > So naturally, we should have > _PAGE_USER = 0x001 > _PAGE_RW = 0x002 > > Today 0x001 and 0x002 and _PAGE_PRESENT and _PAGE_HASHPTE which > both are software only bits. > > Switch _PAGE_USER and _PAGE_PRESET > Switch _PAGE_RW and _PAGE_HASHPTE > > This allows to remove a few insns. > > Signed-off-by: Christophe Leroy Applied to powerpc next, thanks. https://git.kernel.org/powerpc/c/697ece78f8f749aeea40f2711389901f0974017a cheers