From patchwork Sun Jun 3 05:22:54 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Williams X-Patchwork-Id: 10445155 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 53F7460234 for ; Sun, 3 Jun 2018 05:32:53 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 43468289D6 for ; Sun, 3 Jun 2018 05:32:53 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 367EE28AFB; Sun, 3 Jun 2018 05:32:53 +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=-2.9 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 Received: from ml01.01.org (ml01.01.org [198.145.21.10]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id CE673289D6 for ; Sun, 3 Jun 2018 05:32:52 +0000 (UTC) Received: from [127.0.0.1] (localhost [IPv6:::1]) by ml01.01.org (Postfix) with ESMTP id B48B92097E264; Sat, 2 Jun 2018 22:32:52 -0700 (PDT) X-Original-To: linux-nvdimm@lists.01.org Delivered-To: linux-nvdimm@lists.01.org Received-SPF: Pass (sender SPF authorized) identity=mailfrom; client-ip=192.55.52.93; helo=mga11.intel.com; envelope-from=dan.j.williams@intel.com; receiver=linux-nvdimm@lists.01.org Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 0006D203B9904 for ; Sat, 2 Jun 2018 22:32:51 -0700 (PDT) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga102.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 02 Jun 2018 22:32:51 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.49,472,1520924400"; d="scan'208";a="53172438" Received: from dwillia2-desk3.jf.intel.com (HELO dwillia2-desk3.amr.corp.intel.com) ([10.54.39.16]) by fmsmga002.fm.intel.com with ESMTP; 02 Jun 2018 22:32:51 -0700 Subject: [PATCH v2 02/11] device-dax: Cleanup vm_fault de-reference chains From: Dan Williams To: linux-nvdimm@lists.01.org Date: Sat, 02 Jun 2018 22:22:54 -0700 Message-ID: <152800337429.17112.14515997163907857953.stgit@dwillia2-desk3.amr.corp.intel.com> In-Reply-To: <152800336321.17112.3300876636370683279.stgit@dwillia2-desk3.amr.corp.intel.com> References: <152800336321.17112.3300876636370683279.stgit@dwillia2-desk3.amr.corp.intel.com> User-Agent: StGit/0.18-2-gc94f MIME-Version: 1.0 X-BeenThere: linux-nvdimm@lists.01.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: "Linux-nvdimm developer list." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, jack@suse.cz, hch@lst.de Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" X-Virus-Scanned: ClamAV using ClamSMTP Define a local 'vma' variable rather than repetitively de-referencing the passed in 'struct vm_fault *' instance. Signed-off-by: Dan Williams --- drivers/dax/device.c | 30 ++++++++++++++++-------------- 1 file changed, 16 insertions(+), 14 deletions(-) diff --git a/drivers/dax/device.c b/drivers/dax/device.c index d44d98c54d0f..686de08e120b 100644 --- a/drivers/dax/device.c +++ b/drivers/dax/device.c @@ -247,13 +247,14 @@ __weak phys_addr_t dax_pgoff_to_phys(struct dev_dax *dev_dax, pgoff_t pgoff, static vm_fault_t __dev_dax_pte_fault(struct dev_dax *dev_dax, struct vm_fault *vmf) { + struct vm_area_struct *vma = vmf->vma; struct device *dev = &dev_dax->dev; struct dax_region *dax_region; phys_addr_t phys; pfn_t pfn; unsigned int fault_size = PAGE_SIZE; - if (check_vma(dev_dax, vmf->vma, __func__)) + if (check_vma(dev_dax, vma, __func__)) return VM_FAULT_SIGBUS; dax_region = dev_dax->region; @@ -274,13 +275,14 @@ static vm_fault_t __dev_dax_pte_fault(struct dev_dax *dev_dax, pfn = phys_to_pfn_t(phys, dax_region->pfn_flags); - return vmf_insert_mixed(vmf->vma, vmf->address, pfn); + return vmf_insert_mixed(vma, vmf->address, pfn); } static vm_fault_t __dev_dax_pmd_fault(struct dev_dax *dev_dax, struct vm_fault *vmf) { unsigned long pmd_addr = vmf->address & PMD_MASK; + struct vm_area_struct *vma = vmf->vma; struct device *dev = &dev_dax->dev; struct dax_region *dax_region; phys_addr_t phys; @@ -288,7 +290,7 @@ static vm_fault_t __dev_dax_pmd_fault(struct dev_dax *dev_dax, pfn_t pfn; unsigned int fault_size = PMD_SIZE; - if (check_vma(dev_dax, vmf->vma, __func__)) + if (check_vma(dev_dax, vma, __func__)) return VM_FAULT_SIGBUS; dax_region = dev_dax->region; @@ -310,11 +312,10 @@ static vm_fault_t __dev_dax_pmd_fault(struct dev_dax *dev_dax, return VM_FAULT_FALLBACK; /* if we are outside of the VMA */ - if (pmd_addr < vmf->vma->vm_start || - (pmd_addr + PMD_SIZE) > vmf->vma->vm_end) + if (pmd_addr < vma->vm_start || (pmd_addr + PMD_SIZE) > vma->vm_end) return VM_FAULT_SIGBUS; - pgoff = linear_page_index(vmf->vma, pmd_addr); + pgoff = linear_page_index(vma, pmd_addr); phys = dax_pgoff_to_phys(dev_dax, pgoff, PMD_SIZE); if (phys == -1) { dev_dbg(dev, "pgoff_to_phys(%#lx) failed\n", pgoff); @@ -323,7 +324,7 @@ static vm_fault_t __dev_dax_pmd_fault(struct dev_dax *dev_dax, pfn = phys_to_pfn_t(phys, dax_region->pfn_flags); - return vmf_insert_pfn_pmd(vmf->vma, vmf->address, vmf->pmd, pfn, + return vmf_insert_pfn_pmd(vma, vmf->address, vmf->pmd, pfn, vmf->flags & FAULT_FLAG_WRITE); } @@ -332,6 +333,7 @@ static vm_fault_t __dev_dax_pud_fault(struct dev_dax *dev_dax, struct vm_fault *vmf) { unsigned long pud_addr = vmf->address & PUD_MASK; + struct vm_area_struct *vma = vmf->vma; struct device *dev = &dev_dax->dev; struct dax_region *dax_region; phys_addr_t phys; @@ -340,7 +342,7 @@ static vm_fault_t __dev_dax_pud_fault(struct dev_dax *dev_dax, unsigned int fault_size = PUD_SIZE; - if (check_vma(dev_dax, vmf->vma, __func__)) + if (check_vma(dev_dax, vma, __func__)) return VM_FAULT_SIGBUS; dax_region = dev_dax->region; @@ -362,11 +364,10 @@ static vm_fault_t __dev_dax_pud_fault(struct dev_dax *dev_dax, return VM_FAULT_FALLBACK; /* if we are outside of the VMA */ - if (pud_addr < vmf->vma->vm_start || - (pud_addr + PUD_SIZE) > vmf->vma->vm_end) + if (pud_addr < vma->vm_start || (pud_addr + PUD_SIZE) > vma->vm_end) return VM_FAULT_SIGBUS; - pgoff = linear_page_index(vmf->vma, pud_addr); + pgoff = linear_page_index(vma, pud_addr); phys = dax_pgoff_to_phys(dev_dax, pgoff, PUD_SIZE); if (phys == -1) { dev_dbg(dev, "pgoff_to_phys(%#lx) failed\n", pgoff); @@ -375,7 +376,7 @@ static vm_fault_t __dev_dax_pud_fault(struct dev_dax *dev_dax, pfn = phys_to_pfn_t(phys, dax_region->pfn_flags); - return vmf_insert_pfn_pud(vmf->vma, vmf->address, vmf->pud, pfn, + return vmf_insert_pfn_pud(vma, vmf->address, vmf->pud, pfn, vmf->flags & FAULT_FLAG_WRITE); } #else @@ -390,12 +391,13 @@ static vm_fault_t dev_dax_huge_fault(struct vm_fault *vmf, enum page_entry_size pe_size) { int rc, id; - struct file *filp = vmf->vma->vm_file; + struct vm_area_struct *vma = vmf->vma; + struct file *filp = vma->vm_file; struct dev_dax *dev_dax = filp->private_data; dev_dbg(&dev_dax->dev, "%s: %s (%#lx - %#lx) size = %d\n", current->comm, (vmf->flags & FAULT_FLAG_WRITE) ? "write" : "read", - vmf->vma->vm_start, vmf->vma->vm_end, pe_size); + vma->vm_start, vma->vm_end, pe_size); id = dax_read_lock(); switch (pe_size) {