* + mm-add-mremap_dontunmap-to-mremap-v6.patch added to -mm tree
@ 2020-02-19 20:33 akpm
0 siblings, 0 replies; only message in thread
From: akpm @ 2020-02-19 20:33 UTC (permalink / raw)
To: mm-commits, yuzhao, will, sonnyrao, natechancellor, mst, minchan,
luto, kirill, jsbarnes, joel, fweimer, arnd, aarcange, bgeffon
The patch titled
Subject: mm-add-mremap_dontunmap-to-mremap-v6
has been added to the -mm tree. Its filename is
mm-add-mremap_dontunmap-to-mremap-v6.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-add-mremap_dontunmap-to-mremap-v6.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-add-mremap_dontunmap-to-mremap-v6.patch
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------------------------------------------------------
From: Brian Geffon <bgeffon@google.com>
Subject: mm-add-mremap_dontunmap-to-mremap-v6
- Code cleanup suggested by Kirill.
- Correct commit message to more accurately reflect the behavior.
- Clear VM_LOCKED and VM_LOCKEDONFAULT on the old vma.
Link: http://lkml.kernel.org/r/20200218173221.237674-1-bgeffon@google.com
Signed-off-by: Brian Geffon <bgeffon@google.com>
Cc: "Michael S . Tsirkin" <mst@redhat.com>
Cc: Brian Geffon <bgeffon@google.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Will Deacon <will@kernel.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Sonny Rao <sonnyrao@google.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Joel Fernandes <joel@joelfernandes.org>
Cc: Yu Zhao <yuzhao@google.com>
Cc: Jesse Barnes <jsbarnes@google.com>
Cc: Nathan Chancellor <natechancellor@gmail.com>
Cc: Florian Weimer <fweimer@redhat.com>
Cc: "Kirill A . Shutemov" <kirill@shutemov.name>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/mremap.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
--- a/mm/mremap.c~mm-add-mremap_dontunmap-to-mremap-v6
+++ a/mm/mremap.c
@@ -426,8 +426,13 @@ static unsigned long move_vma(struct vm_
* for old_len, but we're now adding new_len - old_len locked
* bytes to the new mapping.
*/
- if (new_len > old_len)
+ if (vm_flags & VM_LOCKED && new_len > old_len) {
mm->locked_vm += (new_len - old_len) >> PAGE_SHIFT;
+ *locked = true;
+ }
+
+ /* We always clear VM_LOCKED[ONFAULT] on the old vma */
+ vma->vm_flags &= VM_LOCKED_CLEAR_MASK;
goto out;
}
@@ -687,7 +692,7 @@ SYSCALL_DEFINE5(mremap, unsigned long, a
if (down_write_killable(¤t->mm->mmap_sem))
return -EINTR;
- if (flags & MREMAP_FIXED || flags & MREMAP_DONTUNMAP) {
+ if (flags & (MREMAP_FIXED | MREMAP_DONTUNMAP)) {
ret = mremap_to(addr, old_len, new_addr, new_len,
&locked, flags, &uf, &uf_unmap_early,
&uf_unmap);
_
Patches currently in -mm which might be from bgeffon@google.com are
mm-add-mremap_dontunmap-to-mremap.patch
mm-add-mremap_dontunmap-to-mremap-v6.patch
selftest-add-mremap_dontunmap-selftest.patch
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2020-02-19 20:33 + mm-add-mremap_dontunmap-to-mremap-v6.patch added to -mm tree akpm
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