From patchwork Mon Mar 27 09:27:23 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Punit Agrawal X-Patchwork-Id: 9645773 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 353E7602D6 for ; Mon, 27 Mar 2017 09:29:47 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 394DB27DA4 for ; Mon, 27 Mar 2017 09:29:47 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2E2D028236; Mon, 27 Mar 2017 09:29:47 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id C386A27DA4 for ; Mon, 27 Mar 2017 09:29:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=DMxn0vVC7QyQbQeJq8iixXmKZ8wLrWu2ay3w4RMpHOQ=; b=JZmU1oqRf1hSohVKS80KRHixxP kDRtBkxBQUd7dUr253l8OEQwFAB04J8+G9/mCFL95R2L7ojq9UUSc6cr4lRtFAU6AgCed8KDfsTp6 WJrmblaeEzcOkkJaTG2x0HVvMh/9Dg937WJ4JEHLgJyY1kVxezYlGoSn8WT6MmZfw7z81aD/ApNBo vLF0+qFdJWh0RpkDX5QYjQM0OnziYKWPI5cTo+BSIJF32oBbbWFuGZFmZp4QxLdysSSbRLX1xsmtE CDUpUnyBmBdpDbO2i2fmpjPdcUJ4NeqpV9JqvB3zltWsSkwBPZCeY5vvVbYaVWDnLUdKlczqaTR2n i0eBvZNg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1csQy9-0004Nd-6L; Mon, 27 Mar 2017 09:29:45 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1csQwn-0002ub-1C for linux-arm-kernel@lists.infradead.org; Mon, 27 Mar 2017 09:28:22 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id B835A80D; Mon, 27 Mar 2017 02:28:02 -0700 (PDT) Received: from localhost (e105922-lin.cambridge.arm.com [10.1.195.42]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 89A2A3F23B; Mon, 27 Mar 2017 02:28:02 -0700 (PDT) From: Punit Agrawal To: will.deacon@arm.com, catalin.marinas@arm.com Subject: [PATCH v2 4/7] arm64: hugetlb: Introduce pte_pgprot helper Date: Mon, 27 Mar 2017 10:27:23 +0100 Message-Id: <20170327092726.31730-5-punit.agrawal@arm.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20170327092726.31730-1-punit.agrawal@arm.com> References: <20170327092726.31730-1-punit.agrawal@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170327_022821_198142_8C0E8449 X-CRM114-Status: UNSURE ( 8.47 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, David Woods , Punit Agrawal , linux-arm-kernel@lists.infradead.org, Steve Capper MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP From: Steve Capper Rather than xor pte bits in various places, use this helper function. Cc: David Woods Signed-off-by: Steve Capper Signed-off-by: Punit Agrawal Reviewed-by: Mark Rutland --- arch/arm64/mm/hugetlbpage.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c index 81bc6e4cf714..44d637eb32a7 100644 --- a/arch/arm64/mm/hugetlbpage.c +++ b/arch/arm64/mm/hugetlbpage.c @@ -41,6 +41,16 @@ int pud_huge(pud_t pud) #endif } +/* + * Select all bits except the pfn + */ +static inline pgprot_t pte_pgprot(pte_t pte) +{ + unsigned long pfn = pte_pfn(pte); + + return __pgprot(pte_val(pfn_pte(pfn, __pgprot(0))) ^ pte_val(pte)); +} + static int find_num_contig(struct mm_struct *mm, unsigned long addr, pte_t *ptep, size_t *pgsize) { @@ -80,7 +90,7 @@ void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, ncontig = find_num_contig(mm, addr, ptep, &pgsize); pfn = pte_pfn(pte); - hugeprot = __pgprot(pte_val(pfn_pte(pfn, __pgprot(0))) ^ pte_val(pte)); + hugeprot = pte_pgprot(pte); for (i = 0; i < ncontig; i++) { pr_debug("%s: set pte %p to 0x%llx\n", __func__, ptep, pte_val(pfn_pte(pfn, hugeprot))); @@ -235,9 +245,7 @@ int huge_ptep_set_access_flags(struct vm_area_struct *vma, size_t pgsize = 0; unsigned long pfn = pte_pfn(pte); /* Select all bits except the pfn */ - pgprot_t hugeprot = - __pgprot(pte_val(pfn_pte(pfn, __pgprot(0))) ^ - pte_val(pte)); + pgprot_t hugeprot = pte_pgprot(pte); cpte = huge_pte_offset(vma->vm_mm, addr); pfn = pte_pfn(*cpte);