* [merged mm-stable] mempolicy-mpol_shared_policy_init-without-pseudo-vma.patch removed from -mm tree
@ 2023-10-25 23:49 Andrew Morton
0 siblings, 0 replies; only message in thread
From: Andrew Morton @ 2023-10-25 23:49 UTC (permalink / raw)
To: mm-commits, yosryahmed, ying.huang, willy, wangkefeng.wang,
vishal.moola, tj, surenb, sidhartha.kumar, shy828301, nphamcs,
mike.kravetz, mhocko, mgorman, gregkh, david, cl, ak, hughd,
akpm
The quilt patch titled
Subject: mempolicy: mpol_shared_policy_init() without pseudo-vma
has been removed from the -mm tree. Its filename was
mempolicy-mpol_shared_policy_init-without-pseudo-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: Hugh Dickins <hughd@google.com>
Subject: mempolicy: mpol_shared_policy_init() without pseudo-vma
Date: Tue, 3 Oct 2023 02:22:59 -0700 (PDT)
mpol_shared_policy_init() does not need to use a pseudo-vma: it can use
sp_alloc() and sp_insert() directly, since the object's shared policy tree
is empty and inaccessible (needing no lock) at get_inode() time.
Link: https://lkml.kernel.org/r/3bef62d8-ae78-4c2-533-56a44ae425c@google.com
Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Huang, Ying" <ying.huang@intel.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Nhat Pham <nphamcs@gmail.com>
Cc: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Tejun heo <tj@kernel.org>
Cc: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Cc: Yang Shi <shy828301@gmail.com>
Cc: Yosry Ahmed <yosryahmed@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/mempolicy.c | 28 ++++++++++++++--------------
1 file changed, 14 insertions(+), 14 deletions(-)
--- a/mm/mempolicy.c~mempolicy-mpol_shared_policy_init-without-pseudo-vma
+++ a/mm/mempolicy.c
@@ -2736,30 +2736,30 @@ void mpol_shared_policy_init(struct shar
rwlock_init(&sp->lock);
if (mpol) {
- struct vm_area_struct pvma;
- struct mempolicy *new;
+ struct sp_node *sn;
+ struct mempolicy *npol;
NODEMASK_SCRATCH(scratch);
if (!scratch)
goto put_mpol;
- /* contextualize the tmpfs mount point mempolicy */
- new = mpol_new(mpol->mode, mpol->flags, &mpol->w.user_nodemask);
- if (IS_ERR(new))
+
+ /* contextualize the tmpfs mount point mempolicy to this file */
+ npol = mpol_new(mpol->mode, mpol->flags, &mpol->w.user_nodemask);
+ if (IS_ERR(npol))
goto free_scratch; /* no valid nodemask intersection */
task_lock(current);
- ret = mpol_set_nodemask(new, &mpol->w.user_nodemask, scratch);
+ ret = mpol_set_nodemask(npol, &mpol->w.user_nodemask, scratch);
task_unlock(current);
if (ret)
- goto put_new;
-
- /* Create pseudo-vma that contains just the policy */
- vma_init(&pvma, NULL);
- pvma.vm_end = TASK_SIZE; /* policy covers entire file */
- mpol_set_shared_policy(sp, &pvma, new); /* adds ref */
+ goto put_npol;
-put_new:
- mpol_put(new); /* drop initial ref */
+ /* alloc node covering entire file; adds ref to file's npol */
+ sn = sp_alloc(0, MAX_LFS_FILESIZE >> PAGE_SHIFT, npol);
+ if (sn)
+ sp_insert(sp, sn);
+put_npol:
+ mpol_put(npol); /* drop initial ref on file's npol */
free_scratch:
NODEMASK_SCRATCH_FREE(scratch);
put_mpol:
_
Patches currently in -mm which might be from hughd@google.com are
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