diff options
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/mm/pat.c | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c index 74a702674e86..0eb572eda406 100644 --- a/arch/x86/mm/pat.c +++ b/arch/x86/mm/pat.c @@ -677,7 +677,7 @@ int track_pfn_copy(struct vm_area_struct *vma) unsigned long vma_size = vma->vm_end - vma->vm_start; pgprot_t pgprot; - if (is_linear_pfn_mapping(vma)) { + if (vma->vm_flags & VM_PAT) { /* * reserve the whole chunk covered by vma. We need the * starting address and protection from pte. @@ -699,14 +699,20 @@ int track_pfn_copy(struct vm_area_struct *vma) * single reserve_pfn_range call. */ int track_pfn_remap(struct vm_area_struct *vma, pgprot_t *prot, - unsigned long pfn, unsigned long size) + unsigned long pfn, unsigned long addr, unsigned long size) { resource_size_t paddr = (resource_size_t)pfn << PAGE_SHIFT; unsigned long flags; /* reserve the whole chunk starting from paddr */ - if (is_linear_pfn_mapping(vma)) - return reserve_pfn_range(paddr, size, prot, 0); + if (addr == vma->vm_start && size == (vma->vm_end - vma->vm_start)) { + int ret; + + ret = reserve_pfn_range(paddr, size, prot, 0); + if (!ret) + vma->vm_flags |= VM_PAT; + return ret; + } if (!pat_enabled) return 0; @@ -758,7 +764,7 @@ void untrack_pfn(struct vm_area_struct *vma, unsigned long pfn, resource_size_t paddr; unsigned long prot; - if (!is_linear_pfn_mapping(vma)) + if (!(vma->vm_flags & VM_PAT)) return; /* free the chunk starting from pfn or the whole chunk */ @@ -772,6 +778,7 @@ void untrack_pfn(struct vm_area_struct *vma, unsigned long pfn, size = vma->vm_end - vma->vm_start; } free_pfn_range(paddr, size); + vma->vm_flags &= ~VM_PAT; } pgprot_t pgprot_writecombine(pgprot_t prot) |