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dax: don't use set_huge_zero_page()

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This is another place where DAX assumed that pgtable_t was a pointer.
Open code the important parts of set_huge_zero_page() in DAX and make
set_huge_zero_page() static again.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kirill A. Shutemov 2015-09-08 14:59:34 -07:00 • committed by Linus Torvalds
parent da14676900
commit d295e3415a
3 changed files with 13 additions and 10 deletions
Download patch file Download diff file Expand all files Collapse all files

16
fs/dax.c
View file

@ -572,18 +572,24 @@ int __dax_pmd_fault(struct vm_area_struct *vma, unsigned long address,
unmap_mapping_range(mapping, pgoff << PAGE_SHIFT, PMD_SIZE, 0); unmap_mapping_range(mapping, pgoff << PAGE_SHIFT, PMD_SIZE, 0);
if (!write && !buffer_mapped(&bh) && buffer_uptodate(&bh)) { if (!write && !buffer_mapped(&bh) && buffer_uptodate(&bh)) {
bool set;
spinlock_t *ptl; spinlock_t *ptl;
struct mm_struct *mm = vma->vm_mm; pmd_t entry;
struct page *zero_page = get_huge_zero_page(); struct page *zero_page = get_huge_zero_page();
if (unlikely(!zero_page)) if (unlikely(!zero_page))
goto fallback; goto fallback;
ptl = pmd_lock(mm, pmd); ptl = pmd_lock(vma->vm_mm, pmd);
set = set_huge_zero_page(NULL, mm, vma, pmd_addr, pmd, if (!pmd_none(*pmd)) {
zero_page);
spin_unlock(ptl); spin_unlock(ptl);
goto fallback;
}
entry = mk_pmd(zero_page, vma->vm_page_prot);
entry = pmd_mkhuge(entry);
set_pmd_at(vma->vm_mm, pmd_addr, pmd, entry);
result = VM_FAULT_NOPAGE; result = VM_FAULT_NOPAGE;
spin_unlock(ptl);
} else { } else {
sector = bh.b_blocknr << (blkbits - 9); sector = bh.b_blocknr << (blkbits - 9);
length = bdev_direct_access(bh.b_bdev, sector, &kaddr, &pfn, length = bdev_direct_access(bh.b_bdev, sector, &kaddr, &pfn,

3
include/linux/huge_mm.h
View file

@ -163,9 +163,6 @@ static inline bool is_huge_zero_pmd(pmd_t pmd)
} }
struct page *get_huge_zero_page(void); struct page *get_huge_zero_page(void);
bool set_huge_zero_page(pgtable_t pgtable, struct mm_struct *mm,
struct vm_area_struct *vma, unsigned long haddr,
pmd_t *pmd, struct page *zero_page);
#else /* CONFIG_TRANSPARENT_HUGEPAGE */ #else /* CONFIG_TRANSPARENT_HUGEPAGE */
#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; }) #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })

2
mm/huge_memory.c
View file

@ -790,7 +790,7 @@ static inline gfp_t alloc_hugepage_gfpmask(int defrag, gfp_t extra_gfp)
} }
/* Caller must hold page table lock. */ /* Caller must hold page table lock. */
bool set_huge_zero_page(pgtable_t pgtable, struct mm_struct *mm, static bool set_huge_zero_page(pgtable_t pgtable, struct mm_struct *mm,
struct vm_area_struct *vma, unsigned long haddr, pmd_t *pmd, struct vm_area_struct *vma, unsigned long haddr, pmd_t *pmd,
struct page *zero_page) struct page *zero_page)
{ {