From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx174.postini.com [74.125.245.174]) by kanga.kvack.org (Postfix) with SMTP id 025AB6B0073 for ; Tue, 31 Jul 2012 06:42:04 -0400 (EDT) Received: by lbjn8 with SMTP id n8so4882724lbj.14 for ; Tue, 31 Jul 2012 03:42:02 -0700 (PDT) Subject: [PATCH v3 01/10] x86, pat: remove the dependency on 'vm_pgoff' in track/untrack pfn vma routines From: Konstantin Khlebnikov Date: Tue, 31 Jul 2012 14:41:59 +0400 Message-ID: <20120731104159.20515.24451.stgit@zurg> In-Reply-To: <20120731103724.20515.60334.stgit@zurg> References: <20120731103724.20515.60334.stgit@zurg> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: linux-mm@kvack.org, Andrew Morton , linux-kernel@vger.kernel.org Cc: Venkatesh Pallipadi , Suresh Siddha , Ingo Molnar , "H. Peter Anvin" , Linus Torvalds , Nick Piggin From: Suresh Siddha 'pfn' argument for track_pfn_vma_new() can be used for reserving the attribute for the pfn range. No need to depend on 'vm_pgoff' Similarly, untrack_pfn_vma() can depend on the 'pfn' argument if it is non-zero or can use follow_phys() to get the starting value of the pfn range. Also the non zero 'size' argument can be used instead of recomputing it from vma. This cleanup also prepares the ground for the track/untrack pfn vma routines to take over the ownership of setting PAT specific vm_flag in the 'vma'. [khlebnikov@openvz.org: Clear pfn to paddr conversion] Signed-off-by: Suresh Siddha Signed-off-by: Konstantin Khlebnikov Cc: Venkatesh Pallipadi Cc: H. Peter Anvin Cc: Nick Piggin Cc: Ingo Molnar --- arch/x86/mm/pat.c | 33 +++++++++++++++++++-------------- 1 file changed, 19 insertions(+), 14 deletions(-) diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c index 3d68ef6..de36c88 100644 --- a/arch/x86/mm/pat.c +++ b/arch/x86/mm/pat.c @@ -704,21 +704,18 @@ int track_pfn_vma_copy(struct vm_area_struct *vma) int track_pfn_vma_new(struct vm_area_struct *vma, pgprot_t *prot, unsigned long pfn, unsigned long size) { + resource_size_t paddr = (resource_size_t)pfn << PAGE_SHIFT; unsigned long flags; - resource_size_t paddr; - unsigned long vma_size = vma->vm_end - vma->vm_start; - if (is_linear_pfn_mapping(vma)) { - /* reserve the whole chunk starting from vm_pgoff */ - paddr = (resource_size_t)vma->vm_pgoff << PAGE_SHIFT; - return reserve_pfn_range(paddr, vma_size, prot, 0); - } + /* reserve the whole chunk starting from paddr */ + if (is_linear_pfn_mapping(vma)) + return reserve_pfn_range(paddr, size, prot, 0); if (!pat_enabled) return 0; /* for vm_insert_pfn and friends, we set prot based on lookup */ - flags = lookup_memtype(pfn << PAGE_SHIFT); + flags = lookup_memtype(paddr); *prot = __pgprot((pgprot_val(vma->vm_page_prot) & (~_PAGE_CACHE_MASK)) | flags); @@ -728,20 +725,28 @@ int track_pfn_vma_new(struct vm_area_struct *vma, pgprot_t *prot, /* * untrack_pfn_vma is called while unmapping a pfnmap for a region. * untrack can be called for a specific region indicated by pfn and size or - * can be for the entire vma (in which case size can be zero). + * can be for the entire vma (in which case pfn, size are zero). */ void untrack_pfn_vma(struct vm_area_struct *vma, unsigned long pfn, unsigned long size) { resource_size_t paddr; - unsigned long vma_size = vma->vm_end - vma->vm_start; + unsigned long prot; - if (is_linear_pfn_mapping(vma)) { - /* free the whole chunk starting from vm_pgoff */ - paddr = (resource_size_t)vma->vm_pgoff << PAGE_SHIFT; - free_pfn_range(paddr, vma_size); + if (!is_linear_pfn_mapping(vma)) return; + + /* free the chunk starting from pfn or the whole chunk */ + paddr = (resource_size_t)pfn << PAGE_SHIFT; + if (!paddr && !size) { + if (follow_phys(vma, vma->vm_start, 0, &prot, &paddr)) { + WARN_ON_ONCE(1); + return; + } + + size = vma->vm_end - vma->vm_start; } + free_pfn_range(paddr, size); } pgprot_t pgprot_writecombine(pgprot_t prot) -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org