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mm: fix pfn_t to page conversion in vm_insert_mixed 

pfn_t_to_page() honors the flags in the pfn_t value to determine if a
pfn is backed by a page.  However, vm_insert_mixed() was originally
written to use pfn_valid() to make this determination.  To restore the
old/correct behavior, ignore the pfn_t flags in the !pfn_t_devmap() case
and fallback to trusting pfn_valid().

Fixes: 01c8f1c44b ("mm, dax, gpu: convert vm_insert_mixed to pfn_t")
Cc: Dave Hansen <dave@sr71.net>
Cc: David Airlie <airlied@linux.ie>
Reported-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Tested-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2016-01-26 09:48:05 -08:00
parent d1a5f2b4d8
commit 03fc2da63b
1 changed files with 7 additions and 2 deletions
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9
mm/memory.c
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@ -1591,10 +1591,15 @@ int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
* than insert_pfn). If a zero_pfn were inserted into a VM_MIXEDMAP * than insert_pfn). If a zero_pfn were inserted into a VM_MIXEDMAP
* without pte special, it would there be refcounted as a normal page. * without pte special, it would there be refcounted as a normal page.
*/ */
if (!HAVE_PTE_SPECIAL && pfn_t_valid(pfn)) { if (!HAVE_PTE_SPECIAL && !pfn_t_devmap(pfn) && pfn_t_valid(pfn)) {
struct page *page; struct page *page;
page = pfn_t_to_page(pfn); /*
* At this point we are committed to insert_page()
* regardless of whether the caller specified flags that
* result in pfn_t_has_page() == false.
*/
page = pfn_to_page(pfn_t_to_pfn(pfn));
return insert_page(vma, addr, page, vma->vm_page_prot); return insert_page(vma, addr, page, vma->vm_page_prot);
} }
return insert_pfn(vma, addr, pfn, vma->vm_page_prot); return insert_pfn(vma, addr, pfn, vma->vm_page_prot);