From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: Wed, 19 Aug 2020 13:52:47 +0000 (+0200)
Subject: drop queue-5.8/khugepaged-khugepaged_test_exit-check-mmget_still_valid.patch
X-Git-Tag: v4.14.194~20
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=274bfb18ac6a07908276a6b5aaf53c5c186f2e00;p=thirdparty%2Fkernel%2Fstable-queue.git

drop queue-5.8/khugepaged-khugepaged_test_exit-check-mmget_still_valid.patch
---

diff --git a/queue-5.8/khugepaged-khugepaged_test_exit-check-mmget_still_valid.patch b/queue-5.8/khugepaged-khugepaged_test_exit-check-mmget_still_valid.patch
deleted file mode 100644
index 0829e5dbde5..00000000000
--- a/queue-5.8/khugepaged-khugepaged_test_exit-check-mmget_still_valid.patch
+++ /dev/null
@@ -1,56 +0,0 @@
-From bbe98f9cadff58cdd6a4acaeba0efa8565dabe65 Mon Sep 17 00:00:00 2001
-From: Hugh Dickins <hughd@google.com>
-Date: Thu, 6 Aug 2020 23:26:25 -0700
-Subject: khugepaged: khugepaged_test_exit() check mmget_still_valid()
-
-From: Hugh Dickins <hughd@google.com>
-
-commit bbe98f9cadff58cdd6a4acaeba0efa8565dabe65 upstream.
-
-Move collapse_huge_page()'s mmget_still_valid() check into
-khugepaged_test_exit() itself.  collapse_huge_page() is used for anon THP
-only, and earned its mmget_still_valid() check because it inserts a huge
-pmd entry in place of the page table's pmd entry; whereas
-collapse_file()'s retract_page_tables() or collapse_pte_mapped_thp()
-merely clears the page table's pmd entry.  But core dumping without mmap
-lock must have been as open to mistaking a racily cleared pmd entry for a
-page table at physical page 0, as exit_mmap() was.  And we certainly have
-no interest in mapping as a THP once dumping core.
-
-Fixes: 59ea6d06cfa9 ("coredump: fix race condition between collapse_huge_page() and core dumping")
-Signed-off-by: Hugh Dickins <hughd@google.com>
-Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
-Cc: Andrea Arcangeli <aarcange@redhat.com>
-Cc: Song Liu <songliubraving@fb.com>
-Cc: Mike Kravetz <mike.kravetz@oracle.com>
-Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
-Cc: <stable@vger.kernel.org>	[4.8+]
-Link: http://lkml.kernel.org/r/alpine.LSU.2.11.2008021217020.27773@eggly.anvils
-Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-
----
- mm/khugepaged.c |    5 +----
- 1 file changed, 1 insertion(+), 4 deletions(-)
-
---- a/mm/khugepaged.c
-+++ b/mm/khugepaged.c
-@@ -431,7 +431,7 @@ static void insert_to_mm_slots_hash(stru
- 
- static inline int khugepaged_test_exit(struct mm_struct *mm)
- {
--	return atomic_read(&mm->mm_users) == 0;
-+	return atomic_read(&mm->mm_users) == 0 || !mmget_still_valid(mm);
- }
- 
- static bool hugepage_vma_check(struct vm_area_struct *vma,
-@@ -1100,9 +1100,6 @@ static void collapse_huge_page(struct mm
- 	 * handled by the anon_vma lock + PG_lock.
- 	 */
- 	mmap_write_lock(mm);
--	result = SCAN_ANY_PROCESS;
--	if (!mmget_still_valid(mm))
--		goto out;
- 	result = hugepage_vma_revalidate(mm, address, &vma);
- 	if (result)
- 		goto out;
diff --git a/queue-5.8/series b/queue-5.8/series
index 1b03564febb..b7d83747830 100644
--- a/queue-5.8/series
+++ b/queue-5.8/series
@@ -78,7 +78,6 @@ khugepaged-collapse_pte_mapped_thp-flush-the-right-range.patch
 mm-hugetlb-fix-calculation-of-adjust_range_if_pmd_sharing_possible.patch
 khugepaged-collapse_pte_mapped_thp-protect-the-pmd-lock.patch
 khugepaged-retract_page_tables-remember-to-test-exit.patch
-khugepaged-khugepaged_test_exit-check-mmget_still_valid.patch
 hugetlbfs-remove-call-to-huge_pte_alloc-without-i_mmap_rwsem.patch
 mm-shuffle-don-t-move-pages-between-zones-and-don-t-read-garbage-memmaps.patch
 mm-fix-kthread_use_mm-vs-tlb-invalidate.patch