+ mm-remove-unneeded-pageanon-check-in-restore_exclusive_pte.patch added to mm-unstable branch

+ mm-remove-unneeded-pageanon-check-in-restore_exclusive_pte.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm: remove unneeded PageAnon check in restore_exclusive_pte()
has been added to the -mm mm-unstable branch.  Its filename is
     mm-remove-unneeded-pageanon-check-in-restore_exclusive_pte.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-remove-unneeded-pageanon-check-in-restore_exclusive_pte.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Before you just go and hit "reply", please:
   a) Consider who else should be cc'ed
   b) Prefer to cc a suitable mailing list as well
   c) Ideally: find the original patch on the mailing list and do a
      reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days

------------------------------------------------------
From: Miaohe Lin <linmiaohe@huawei.com>
Subject: mm: remove unneeded PageAnon check in restore_exclusive_pte()
Date: Sat, 16 Jul 2022 16:18:16 +0800

When code reaches here, the page must be !PageAnon.  There's no need to
check PageAnon again.  Remove it.

Link: https://lkml.kernel.org/r/20220716081816.10752-1-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/memory.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/memory.c~mm-remove-unneeded-pageanon-check-in-restore_exclusive_pte
+++ a/mm/memory.c
@@ -753,7 +753,7 @@ static void restore_exclusive_pte(struct
 		 * Currently device exclusive access only supports anonymous
 		 * memory so the entry shouldn't point to a filebacked page.
 		 */
-		WARN_ON_ONCE(!PageAnon(page));
+		WARN_ON_ONCE(1);
 
 	set_pte_at(vma->vm_mm, address, ptep, pte);
 
_

Patches currently in -mm which might be from linmiaohe@huawei.com are

mm-hugetlb-avoid-corrupting-page-mapping-in-hugetlb_mcopy_atomic_pte.patch
mm-page_alloc-minor-clean-up-for-memmap_init_compound.patch
mm-mmapc-fix-missing-call-to-vm_unacct_memory-in-mmap_region.patch
filemap-minor-cleanup-for-filemap_write_and_wait_range.patch
mm-remove-obsolete-comment-in-do_fault_around.patch
mm-remove-unneeded-pageanon-check-in-restore_exclusive_pte.patch