diff options
| -rw-r--r-- | arch/x86/mm/pat.c | 33 |
1 files changed, 19 insertions, 14 deletions
diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c index 3d68ef6d226..de36c886cd3 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) |