[merged] mm-proc-make-the-task_mmu-walk_page_range-limit-in-clear_refs_write-obvious.patch removed from -mm tree

[merged] mm-proc-make-the-task_mmu-walk_page_range-limit-in-clear_refs_write-obvious.patch removed from -mm tree

[akpm]

The patch titled
     Subject: fs/proc/task_mmu.c: make the task_mmu walk_page_range() limit in clear_refs_write() obvious
has been removed from the -mm tree.  Its filename was
     mm-proc-make-the-task_mmu-walk_page_range-limit-in-clear_refs_write-obvious.patch

This patch was dropped because it was merged into mainline or a subsystem tree

------------------------------------------------------
From: James Morse <james.morse@arm.com>
Subject: fs/proc/task_mmu.c: make the task_mmu walk_page_range() limit in clear_refs_write() obvious

Trying to walk all of virtual memory requires architecture specific
knowledge.  On x86_64, addresses must be sign extended from bit 48,
whereas on arm64 the top VA_BITS of address space have their own set of
page tables.

clear_refs_write() calls walk_page_range() on the range 0 to ~0UL, it
provides a test_walk() callback that only expects to be walking over VMAs.
Currently walk_pmd_range() will skip memory regions that don't have a
VMA, reporting them as a hole.

As this call only expects to walk user address space, make it walk 0 to
'highest_vm_end'.

Link: http://lkml.kernel.org/r/1472655792-22439-1-git-send-email-james.morse@arm.com
Signed-off-by: James Morse <james.morse@arm.com>
Acked-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/proc/task_mmu.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -puN fs/proc/task_mmu.c~mm-proc-make-the-task_mmu-walk_page_range-limit-in-clear_refs_write-obvious fs/proc/task_mmu.c
--- a/fs/proc/task_mmu.c~mm-proc-make-the-task_mmu-walk_page_range-limit-in-clear_refs_write-obvious
+++ a/fs/proc/task_mmu.c
@@ -1070,7 +1070,7 @@ static ssize_t clear_refs_write(struct f
 			}
 			mmu_notifier_invalidate_range_start(mm, 0, -1);
 		}
-		walk_page_range(0, ~0UL, &clear_refs_walk);
+		walk_page_range(0, mm->highest_vm_end, &clear_refs_walk);
 		if (type == CLEAR_REFS_SOFT_DIRTY)
 			mmu_notifier_invalidate_range_end(mm, 0, -1);
 		flush_tlb_mm(mm);
_

Patches currently in -mm which might be from james.morse@arm.com are