The patch titled
mm: move VM_LOCKED check to __mlock_vma_pages_range()
has been added to the -mm tree. Its filename is
mm-move-vm_locked-check-to-__mlock_vma_pages_range.patch
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------------------------------------------------------
Subject: mm: move VM_LOCKED check to __mlock_vma_pages_range()
From: Michel Lespinasse <walken@xxxxxxxxxx>
Use a single code path for faulting in pages during mlock.
The reason to have it in this patch series is that I did not want to
update both code paths in a later change that releases mmap_sem when
blocking on disk.
Signed-off-by: Michel Lespinasse <walken@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Nick Piggin <npiggin@xxxxxxxxx>
Cc: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mlock.c | 18 +++++++++---------
1 file changed, 9 insertions(+), 9 deletions(-)
diff -puN mm/mlock.c~mm-move-vm_locked-check-to-__mlock_vma_pages_range mm/mlock.c
--- a/mm/mlock.c~mm-move-vm_locked-check-to-__mlock_vma_pages_range
+++ a/mm/mlock.c
@@ -169,7 +169,7 @@ static long __mlock_vma_pages_range(stru
VM_BUG_ON(end > vma->vm_end);
VM_BUG_ON(!rwsem_is_locked(&mm->mmap_sem));
- gup_flags = FOLL_TOUCH | FOLL_MLOCK;
+ gup_flags = FOLL_TOUCH;
/*
* We want to touch writable mappings with a write fault in order
* to break COW, except for shared mappings because these don't COW
@@ -178,6 +178,9 @@ static long __mlock_vma_pages_range(stru
if ((vma->vm_flags & (VM_WRITE | VM_SHARED)) == VM_WRITE)
gup_flags |= FOLL_WRITE;
+ if (vma->vm_flags & VM_LOCKED)
+ gup_flags |= FOLL_MLOCK;
+
/* We don't try to access the guard page of a stack vma */
if (stack_guard_page(vma, start)) {
addr += PAGE_SIZE;
@@ -456,14 +459,11 @@ static int do_mlock_pages(unsigned long
/*
* Now fault in a range of pages within the first VMA.
*/
- if (vma->vm_flags & VM_LOCKED) {
- ret = __mlock_vma_pages_range(vma, nstart, nend);
- if (ret) {
- ret = __mlock_posix_error_return(ret);
- break;
- }
- } else
- make_pages_present(nstart, nend);
+ ret = __mlock_vma_pages_range(vma, nstart, nend);
+ if (ret) {
+ ret = __mlock_posix_error_return(ret);
+ break;
+ }
}
up_read(&mm->mmap_sem);
return ret; /* 0 or negative error code */
_
Patches currently in -mm which might be from walken@xxxxxxxxxx are
do_wp_page-remove-the-reuse-flag.patch
do_wp_page-clarify-dirty_page-handling.patch
mlock-avoid-dirtying-pages-and-triggering-writeback.patch
mlock-only-hold-mmap_sem-in-shared-mode-when-faulting-in-pages.patch
mm-add-foll_mlock-follow_page-flag.patch
mm-move-vm_locked-check-to-__mlock_vma_pages_range.patch
rwsem-implement-rwsem_is_contended.patch
mlock-do-not-hold-mmap_sem-for-extended-periods-of-time.patch
x86-rwsem-more-precise-rwsem_is_contended-implementation.patch
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