[PATCH] mm: update comments to pte lock

Updated several references to page_table_lock in common code comments.
Signed-off-by: NHugh Dickins <hugh@veritas.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

include/asm-generic/pgtable.h

@@ -8,7 +8,7 @@
  *  - update the page tables
  *  - inform the TLB about the new one
  *
- * We hold the mm semaphore for reading and vma->vm_mm->page_table_lock.
+ * We hold the mm semaphore for reading, and the pte lock.
  *
  * Note: the old pte is known to not be writable, so we don't need to
  * worry about dirty bits etc getting lost.

include/linux/mempolicy.h

@@ -47,8 +47,7 @@ struct vm_area_struct;
  * Locking policy for interlave:
  * In process context there is no locking because only the process accesses
  * its own state. All vma manipulation is somewhat protected by a down_read on
- * mmap_sem. For allocating in the interleave policy the page_table_lock
- * must be also aquired to protect il_next.
+ * mmap_sem.
  *
  * Freeing policy:
  * When policy is MPOL_BIND v.zonelist is kmalloc'ed and must be kfree'd.

mm/filemap.c

@@ -66,7 +66,7 @@ generic_file_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
  *
  *  ->mmap_sem
  *    ->i_mmap_lock
- *      ->page_table_lock	(various places, mainly in mmap.c)
+ *      ->page_table_lock or pte_lock	(various, mainly in memory.c)
  *        ->mapping->tree_lock	(arch-dependent flush_dcache_mmap_lock)
  *
  *  ->mmap_sem
@@ -86,9 +86,9 @@ generic_file_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
  *    ->anon_vma.lock		(vma_adjust)
  *
  *  ->anon_vma.lock
- *    ->page_table_lock		(anon_vma_prepare and various)
+ *    ->page_table_lock or pte_lock	(anon_vma_prepare and various)
  *
- *  ->page_table_lock
+ *  ->page_table_lock or pte_lock
  *    ->swap_lock		(try_to_unmap_one)
  *    ->private_lock		(try_to_unmap_one)
  *    ->tree_lock		(try_to_unmap_one)

mm/rmap.c

@@ -32,7 +32,7 @@
  *   page->flags PG_locked (lock_page)
  *     mapping->i_mmap_lock
  *       anon_vma->lock
- *         mm->page_table_lock
+ *         mm->page_table_lock or pte_lock
  *           zone->lru_lock (in mark_page_accessed)
  *           swap_lock (in swap_duplicate, swap_info_get)
  *             mmlist_lock (in mmput, drain_mmlist and others)
@@ -244,7 +244,7 @@ unsigned long page_address_in_vma(struct page *page, struct vm_area_struct *vma)
 /*
  * Check that @page is mapped at @address into @mm.
  *
- * On success returns with mapped pte and locked mm->page_table_lock.
+ * On success returns with pte mapped and locked.
  */
 pte_t *page_check_address(struct page *page, struct mm_struct *mm,
 			  unsigned long address, spinlock_t **ptlp)
@@ -445,7 +445,7 @@ int page_referenced(struct page *page, int is_locked, int ignore_token)
  * @vma:	the vm area in which the mapping is added
  * @address:	the user virtual address mapped
  *
- * The caller needs to hold the mm->page_table_lock.
+ * The caller needs to hold the pte lock.
  */
 void page_add_anon_rmap(struct page *page,
 	struct vm_area_struct *vma, unsigned long address)
@@ -468,7 +468,7 @@ void page_add_anon_rmap(struct page *page,
  * page_add_file_rmap - add pte mapping to a file page
  * @page: the page to add the mapping to
  *
- * The caller needs to hold the mm->page_table_lock.
+ * The caller needs to hold the pte lock.
  */
 void page_add_file_rmap(struct page *page)
 {
@@ -483,7 +483,7 @@ void page_add_file_rmap(struct page *page)
  * page_remove_rmap - take down pte mapping from a page
  * @page: page to remove mapping from
  *
- * Caller needs to hold the mm->page_table_lock.
+ * The caller needs to hold the pte lock.
  */
 void page_remove_rmap(struct page *page)
 {

mm/swap_state.c

@@ -259,8 +259,7 @@ static inline void free_swap_cache(struct page *page)
 
 /* 
  * Perform a free_page(), also freeing any swap cache associated with
- * this page if it is the last user of the page. Can not do a lock_page,
- * as we are holding the page_table_lock spinlock.
+ * this page if it is the last user of the page.
  */
 void free_page_and_swap_cache(struct page *page)
 {