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mm: update mmap_sem comments to refer to mmap_lock

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The rename from mm->mmap_sem to mm->mmap_lock was performed in commit
da1c55f1b2 ("mmap locking API: rename mmap_sem to mmap_lock") and commit
c1e8d7c6a7 ("map locking API: convert mmap_sem comments"), however some
incorrect comments remain.

This patch simply corrects those comments which are obviously incorrect
within mm itself.

Link: https://lkml.kernel.org/r/33fba04389ab63fc4980e7ba5442f521df6dc657.1673048927.git.lstoakes@gmail.com
Signed-off-by: Lorenzo Stoakes <lstoakes@gmail.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Lorenzo Stoakes 2023-01-07 00:00:05 +00:00 committed by Andrew Morton
parent 0411d6ee50
commit 8651a137e6
5 changed files with 7 additions and 7 deletions
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2
include/linux/mm_types.h
View File

@ -581,7 +581,7 @@ struct vm_area_struct {
/*
* For private and shared anonymous mappings, a pointer to a null
* terminated string containing the name given to the vma, or NULL if
* unnamed. Serialized by mmap_sem. Use anon_vma_name to access.
* unnamed. Serialized by mmap_lock. Use anon_vma_name to access.
*/
struct anon_vma_name *anon_name;
#endif

2
include/linux/page_ref.h
View File

@ -301,7 +301,7 @@ static inline bool folio_ref_try_add_rcu(struct folio *folio, int count)
*
* You can also use this function if you're holding a lock that prevents
* pages being frozen & removed; eg the i_pages lock for the page cache
* or the mmap_sem or page table lock for page tables. In this case,
* or the mmap_lock or page table lock for page tables. In this case,
* it will always succeed, and you could have used a plain folio_get(),
* but it's sometimes more convenient to have a common function called
* from both locked and RCU-protected contexts.

4
mm/hugetlb.c
View File

@ -1183,7 +1183,7 @@ void hugetlb_dup_vma_private(struct vm_area_struct *vma)
/*
* Reset and decrement one ref on hugepage private reservation.
* Called with mm->mmap_sem writer semaphore held.
* Called with mm->mmap_lock writer semaphore held.
* This function should be only used by move_vma() and operate on
* same sized vma. It should never come here with last ref on the
* reservation.
@ -5152,7 +5152,7 @@ static void move_huge_pte(struct vm_area_struct *vma, unsigned long old_addr,
/*
* We don't have to worry about the ordering of src and dst ptlocks
* because exclusive mmap_sem (or the i_mmap_lock) prevents deadlock.
* because exclusive mmap_lock (or the i_mmap_lock) prevents deadlock.
*/
if (src_ptl != dst_ptl)
spin_lock_nested(src_ptl, SINGLE_DEPTH_NESTING);

2
mm/madvise.c
View File

@ -130,7 +130,7 @@ static int replace_anon_vma_name(struct vm_area_struct *vma,
#endif /* CONFIG_ANON_VMA_NAME */
/*
* Update the vm_flags on region of a vma, splitting it or merging it as
* necessary. Must be called with mmap_sem held for writing;
* necessary. Must be called with mmap_lock held for writing;
* Caller should ensure anon_name stability by raising its refcount even when
* anon_name belongs to a valid vma because this function might free that vma.
*/

4
mm/mmap.c
View File

@ -2294,7 +2294,7 @@ static inline int munmap_sidetree(struct vm_area_struct *vma,
* @start: The aligned start address to munmap.
* @end: The aligned end address to munmap.
* @uf: The userfaultfd list_head
* @downgrade: Set to true to attempt a write downgrade of the mmap_sem
* @downgrade: Set to true to attempt a write downgrade of the mmap_lock
*
* If @downgrade is true, check return code for potential release of the lock.
*/
@ -2469,7 +2469,7 @@ map_count_exceeded:
* @len: The length of the range to munmap
* @uf: The userfaultfd list_head
* @downgrade: set to true if the user wants to attempt to write_downgrade the
* mmap_sem
* mmap_lock
*
* This function takes a @mas that is either pointing to the previous VMA or set
* to MA_START and sets it up to remove the mapping(s). The @len will be