From patchwork Wed May 24 11:54:02 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Punit Agrawal X-Patchwork-Id: 9745835 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 26FD560209 for ; Wed, 24 May 2017 11:55:25 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 13FF428942 for ; Wed, 24 May 2017 11:55:25 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 0789528963; Wed, 24 May 2017 11:55:25 +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 6BB3428942 for ; Wed, 24 May 2017 11:55:24 +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=CsizFvy3X24R4jOviC3RENbskszpcT/Fx2GsAjGqNW8=; b=jnOF64eAh6vk3JkrDA0nd8zigX 262DyJLqEPefj8kZe7sp7Ek2Fimu93VsyYTN7vB1KF3xF1zWyDrx4Szv3HYdAR49ogWg57U0QFQVK Yq5ZqXekuc0tL0lpXeKOhKJcv2pI/nNNLFEVBiLB9IgQTOgIL8kEozWieuVzhcwAgM68arR8QFBl9 tNUyeTCqGVXWelNKNFP5QbO8z9QVEqTLGLXlP8s3iQh2FJKxKjf6IRQWJa9v47atXm5jExB1g1R7y oyrhdwTtOHU4BArsy7y6D3XAT109RXVU6RfHHjZc4T/staW14jbDjR8Ci6LGtkHvXZIjvV2aBwoNw +K6/opFQ==; 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 1dDUst-0001Ua-I0; Wed, 24 May 2017 11:55:23 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1dDUsq-00009x-LI for linux-arm-kernel@lists.infradead.org; Wed, 24 May 2017 11:55:22 +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 7CA16344; Wed, 24 May 2017 04:55:00 -0700 (PDT) Received: from localhost (e105922-lin.cambridge.arm.com [10.1.207.56]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 4B9633F578; Wed, 24 May 2017 04:55:00 -0700 (PDT) From: Punit Agrawal To: akpm@linux-foundation.org Subject: [PATCH v4 1/8] arm64: hugetlb: Refactor find_num_contig Date: Wed, 24 May 2017 12:54:02 +0100 Message-Id: <20170524115409.31309-2-punit.agrawal@arm.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20170524115409.31309-1-punit.agrawal@arm.com> References: <20170524115409.31309-1-punit.agrawal@arm.com> X-ARM-No-Footer: FoSSMail X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170524_045520_719222_80F6C93F X-CRM114-Status: UNSURE ( 9.59 ) 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, linux-arch@vger.kernel.org, David Woods , Steve Capper , catalin.marinas@arm.com, Punit Agrawal , will.deacon@arm.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org 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 As we regularly check for contiguous pte's in the huge accessors, remove this extra check from find_num_contig. Cc: David Woods Signed-off-by: Steve Capper [ Resolved rebase conflicts due to patch re-ordering ] Signed-off-by: Punit Agrawal --- arch/arm64/mm/hugetlbpage.c | 17 ++++++++--------- 1 file changed, 8 insertions(+), 9 deletions(-) diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c index 69b8200b1cfd..710bf935a473 100644 --- a/arch/arm64/mm/hugetlbpage.c +++ b/arch/arm64/mm/hugetlbpage.c @@ -42,15 +42,13 @@ int pud_huge(pud_t pud) } static int find_num_contig(struct mm_struct *mm, unsigned long addr, - pte_t *ptep, pte_t pte, size_t *pgsize) + pte_t *ptep, size_t *pgsize) { pgd_t *pgd = pgd_offset(mm, addr); pud_t *pud; pmd_t *pmd; *pgsize = PAGE_SIZE; - if (!pte_cont(pte)) - return 1; pud = pud_offset(pgd, addr); pmd = pmd_offset(pud, addr); if ((pte_t *)pmd == ptep) { @@ -65,15 +63,16 @@ void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, { size_t pgsize; int i; - int ncontig = find_num_contig(mm, addr, ptep, pte, &pgsize); + int ncontig; unsigned long pfn; pgprot_t hugeprot; - if (ncontig == 1) { + if (!pte_cont(pte)) { set_pte_at(mm, addr, ptep, pte); return; } + ncontig = find_num_contig(mm, addr, ptep, &pgsize); pfn = pte_pfn(pte); hugeprot = __pgprot(pte_val(pfn_pte(pfn, __pgprot(0))) ^ pte_val(pte)); for (i = 0; i < ncontig; i++) { @@ -188,7 +187,7 @@ pte_t huge_ptep_get_and_clear(struct mm_struct *mm, bool is_dirty = false; cpte = huge_pte_offset(mm, addr); - ncontig = find_num_contig(mm, addr, cpte, *cpte, &pgsize); + ncontig = find_num_contig(mm, addr, cpte, &pgsize); /* save the 1st pte to return */ pte = ptep_get_and_clear(mm, addr, cpte); for (i = 1, addr += pgsize; i < ncontig; ++i, addr += pgsize) { @@ -228,7 +227,7 @@ int huge_ptep_set_access_flags(struct vm_area_struct *vma, cpte = huge_pte_offset(vma->vm_mm, addr); pfn = pte_pfn(*cpte); ncontig = find_num_contig(vma->vm_mm, addr, cpte, - *cpte, &pgsize); + &pgsize); for (i = 0; i < ncontig; ++i, ++cpte, addr += pgsize) { changed |= ptep_set_access_flags(vma, addr, cpte, pfn_pte(pfn, @@ -251,7 +250,7 @@ void huge_ptep_set_wrprotect(struct mm_struct *mm, size_t pgsize = 0; cpte = huge_pte_offset(mm, addr); - ncontig = find_num_contig(mm, addr, cpte, *cpte, &pgsize); + ncontig = find_num_contig(mm, addr, cpte, &pgsize); for (i = 0; i < ncontig; ++i, ++cpte, addr += pgsize) ptep_set_wrprotect(mm, addr, cpte); } else { @@ -269,7 +268,7 @@ void huge_ptep_clear_flush(struct vm_area_struct *vma, cpte = huge_pte_offset(vma->vm_mm, addr); ncontig = find_num_contig(vma->vm_mm, addr, cpte, - *cpte, &pgsize); + &pgsize); for (i = 0; i < ncontig; ++i, ++cpte, addr += pgsize) ptep_clear_flush(vma, addr, cpte); } else {