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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 272EBC433E0 for ; Thu, 18 Jun 2020 01:09:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F2D91221EA for ; Thu, 18 Jun 2020 01:09:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592442577; bh=VbvwX07h7tv/JNZrZ3PGvYl0YFbuhr9qHoWR3e3SoN8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=JFOzJ8CmZnvTbqH0NnCzds/cXkaPKp9Jv5SkUL+tucxEH2F2muyDmciwgomBFYwmk /UMi+oAYrjsgtkBoRe1QZrGZNwp/9P7cuie/V4fsnifUkaeT2DfBJuScXOCIcBAMjs JbqLH62FUs4/b9o7QmdgCgVSKM1cjRHOnaWOksXk= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728234AbgFRBJg (ORCPT ); Wed, 17 Jun 2020 21:09:36 -0400 Received: from mail.kernel.org ([198.145.29.99]:35964 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728196AbgFRBJc (ORCPT ); Wed, 17 Jun 2020 21:09:32 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 33C9321D92; Thu, 18 Jun 2020 01:09:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592442572; bh=VbvwX07h7tv/JNZrZ3PGvYl0YFbuhr9qHoWR3e3SoN8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=2TnSmiB0gpUmHOt/bhDReDt9ZokH6KAzMGk8cbl+Bgf4iheIObCqeQG8uRvO/mJ45 fBRFFhmZAXotYk++yHQw25yjtVvp4yR0wP0lKFXBYui3KvtMscdh4Y2bC2ZO6cTOP7 dT5tqr81y+I1r3PPtV7ZddjJKoIPzTdCERz7mY28= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: "Aneesh Kumar K.V" , Bharata B Rao , Nicholas Piggin , Michael Ellerman , Sasha Levin , linuxppc-dev@lists.ozlabs.org Subject: [PATCH AUTOSEL 5.7 065/388] powerpc/book3s64/radix/tlb: Determine hugepage flush correctly Date: Wed, 17 Jun 2020 21:02:42 -0400 Message-Id: <20200618010805.600873-65-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200618010805.600873-1-sashal@kernel.org> References: <20200618010805.600873-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "Aneesh Kumar K.V" [ Upstream commit 8f53f9c0f68ab2168f637494b9e24034899c1310 ] With a 64K page size flush with start and end: (start, end) = (721f680d0000, 721f680e0000) results in: (hstart, hend) = (721f68200000, 721f68000000) ie. hstart is above hend, which indicates no huge page flush is needed. However the current logic incorrectly sets hflush = true in this case, because hstart != hend. That causes us to call __tlbie_va_range() passing hstart/hend, to do a huge page flush even though we don't need to. __tlbie_va_range() will skip the actual tlbie operation for start > end. But it will still end up calling fixup_tlbie_va_range() and doing the TLB fixups in there, which is harmless but unnecessary work. Reported-by: Bharata B Rao Signed-off-by: Aneesh Kumar K.V Reviewed-by: Nicholas Piggin [mpe: Drop else case, hflush is already false, flesh out change log] Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200513030616.152288-1-aneesh.kumar@linux.ibm.com Signed-off-by: Sasha Levin --- arch/powerpc/mm/book3s64/radix_tlb.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/arch/powerpc/mm/book3s64/radix_tlb.c b/arch/powerpc/mm/book3s64/radix_tlb.c index 758ade2c2b6e..b5cc9b23cf02 100644 --- a/arch/powerpc/mm/book3s64/radix_tlb.c +++ b/arch/powerpc/mm/book3s64/radix_tlb.c @@ -884,9 +884,7 @@ static inline void __radix__flush_tlb_range(struct mm_struct *mm, if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) { hstart = (start + PMD_SIZE - 1) & PMD_MASK; hend = end & PMD_MASK; - if (hstart == hend) - hflush = false; - else + if (hstart < hend) hflush = true; } -- 2.25.1