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authorSuren Baghdasaryan <surenb@google.com>2023-02-01 01:01:16 +0100
committerAndrew Morton <akpm@linux-foundation.org>2023-02-10 01:51:41 +0100
commit601c3c29dbeb049862faa00917f2daf094a71028 (patch)
tree24e4ec4694356281c6ee9e12858f52a889d977da /mm/mlock.c
parentmm/vmalloc: replace BUG_ON with a simple if statement (diff)
downloadlinux-601c3c29dbeb049862faa00917f2daf094a71028.tar.xz
linux-601c3c29dbeb049862faa00917f2daf094a71028.zip
mm: introduce vm_flags_reset_once to replace WRITE_ONCE vm_flags updates
Provide vm_flags_reset_once() and replace the vm_flags updates which used WRITE_ONCE() to prevent compiler optimizations. Link: https://lkml.kernel.org/r/20230201000116.1333160-1-surenb@google.com Fixes: 0cce31a0aa0e ("mm: replace vma->vm_flags direct modifications with modifier calls") Signed-off-by: Suren Baghdasaryan <surenb@google.com> Reported-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Reviewed-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Acked-by: Michal Hocko <mhocko@suse.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/mlock.c')
-rw-r--r--mm/mlock.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/mlock.c b/mm/mlock.c
index ed49459e343e..617469fce96d 100644
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -380,7 +380,7 @@ static void mlock_vma_pages_range(struct vm_area_struct *vma,
*/
if (newflags & VM_LOCKED)
newflags |= VM_IO;
- vm_flags_reset(vma, newflags);
+ vm_flags_reset_once(vma, newflags);
lru_add_drain();
walk_page_range(vma->vm_mm, start, end, &mlock_walk_ops, NULL);
@@ -388,7 +388,7 @@ static void mlock_vma_pages_range(struct vm_area_struct *vma,
if (newflags & VM_IO) {
newflags &= ~VM_IO;
- vm_flags_reset(vma, newflags);
+ vm_flags_reset_once(vma, newflags);
}
}