[merged mm-stable] mm-pagewalk-dont-trigger-test_walk-in-walk_page_vma.patch removed from -mm tree

[merged mm-stable] mm-pagewalk-dont-trigger-test_walk-in-walk_page_vma.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm/pagewalk: don't trigger test_walk() in walk_page_vma()
has been removed from the -mm tree.  Its filename was
     mm-pagewalk-dont-trigger-test_walk-in-walk_page_vma.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: David Hildenbrand <david@redhat.com>
Subject: mm/pagewalk: don't trigger test_walk() in walk_page_vma()
Date: Fri, 21 Oct 2022 12:11:38 +0200

As Peter points out, the caller passes a single VMA and can just do that
check itself.

And in fact, no existing users rely on test_walk() getting called.  So
let's just remove it and make the implementation slightly more efficient.

Link: https://lkml.kernel.org/r/20221021101141.84170-7-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Peter Xu <peterx@redhat.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/pagewalk.h |    2 ++
 mm/pagewalk.c            |    7 -------
 2 files changed, 2 insertions(+), 7 deletions(-)

--- a/include/linux/pagewalk.h~mm-pagewalk-dont-trigger-test_walk-in-walk_page_vma
+++ a/include/linux/pagewalk.h
@@ -27,6 +27,8 @@ struct mm_walk;
  *			"do page table walk over the current vma", returning
  *			a negative value means "abort current page table walk
  *			right now" and returning 1 means "skip the current vma"
+ *			Note that this callback is not called when the caller
+ *			passes in a single VMA as for walk_page_vma().
  * @pre_vma:            if set, called before starting walk on a non-null vma.
  * @post_vma:           if set, called after a walk on a non-null vma, provided
  *                      that @pre_vma and the vma walk succeeded.
--- a/mm/pagewalk.c~mm-pagewalk-dont-trigger-test_walk-in-walk_page_vma
+++ a/mm/pagewalk.c
@@ -526,18 +526,11 @@ int walk_page_vma(struct vm_area_struct
 		.vma		= vma,
 		.private	= private,
 	};
-	int err;
 
 	if (!walk.mm)
 		return -EINVAL;
 
 	mmap_assert_locked(walk.mm);
-
-	err = walk_page_test(vma->vm_start, vma->vm_end, &walk);
-	if (err > 0)
-		return 0;
-	if (err < 0)
-		return err;
 	return __walk_page_range(vma->vm_start, vma->vm_end, &walk);
 }
 
_

Patches currently in -mm which might be from david@redhat.com are