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| author | Jan Kara <jack@suse.cz> | 2016-12-14 15:07:36 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-12-14 16:04:09 -0800 |
| commit | 997dd98dd68beb2aea74cac53e7fd440cc8dba68 (patch) | |
| tree | 63577e193e977b242f9b934f915aa458cf15c20f /mm | |
| parent | a41b70d6dfc28b9e1a17c2a9f3181c2b614bfd54 (diff) | |
| download | linux-997dd98dd68beb2aea74cac53e7fd440cc8dba68.tar.gz linux-997dd98dd68beb2aea74cac53e7fd440cc8dba68.tar.bz2 linux-997dd98dd68beb2aea74cac53e7fd440cc8dba68.zip | |
mm: move part of wp_page_reuse() into the single call site
wp_page_reuse() handles write shared faults which is needed only in
wp_page_shared(). Move the handling only into that location to make
wp_page_reuse() simpler and avoid a strange situation when we sometimes
pass in locked page, sometimes unlocked etc.
Link: http://lkml.kernel.org/r/1479460644-25076-15-git-send-email-jack@suse.cz
Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/memory.c | 27 |
1 files changed, 12 insertions, 15 deletions
diff --git a/mm/memory.c b/mm/memory.c index ad452898e6c0..82e7689e3059 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -2102,8 +2102,7 @@ static void fault_dirty_shared_page(struct vm_area_struct *vma, * case, all we need to do here is to mark the page as writable and update * any related book-keeping. */ -static inline int wp_page_reuse(struct vm_fault *vmf, - int page_mkwrite, int dirty_shared) +static inline void wp_page_reuse(struct vm_fault *vmf) __releases(vmf->ptl) { struct vm_area_struct *vma = vmf->vma; @@ -2123,16 +2122,6 @@ static inline int wp_page_reuse(struct vm_fault *vmf, if (ptep_set_access_flags(vma, vmf->address, vmf->pte, entry, 1)) update_mmu_cache(vma, vmf->address, vmf->pte); pte_unmap_unlock(vmf->pte, vmf->ptl); - - if (dirty_shared) { - if (!page_mkwrite) - lock_page(page); - - fault_dirty_shared_page(vma, page); - put_page(page); - } - - return VM_FAULT_WRITE; } /* @@ -2307,7 +2296,8 @@ static int wp_pfn_shared(struct vm_fault *vmf) return 0; } } - return wp_page_reuse(vmf, 0, 0); + wp_page_reuse(vmf); + return VM_FAULT_WRITE; } static int wp_page_shared(struct vm_fault *vmf) @@ -2345,7 +2335,13 @@ static int wp_page_shared(struct vm_fault *vmf) page_mkwrite = 1; } - return wp_page_reuse(vmf, page_mkwrite, 1); + wp_page_reuse(vmf); + if (!page_mkwrite) + lock_page(vmf->page); + fault_dirty_shared_page(vma, vmf->page); + put_page(vmf->page); + + return VM_FAULT_WRITE; } /* @@ -2420,7 +2416,8 @@ static int do_wp_page(struct vm_fault *vmf) page_move_anon_rmap(vmf->page, vma); } unlock_page(vmf->page); - return wp_page_reuse(vmf, 0, 0); + wp_page_reuse(vmf); + return VM_FAULT_WRITE; } unlock_page(vmf->page); } else if (unlikely((vma->vm_flags & (VM_WRITE|VM_SHARED)) == |