The patch titled
Subject: mm: use vma_iter_clear_gfp() in nommu
has been added to the -mm mm-unstable branch. Its filename is
mm-use-vma_iter_clear_gfp-in-nommu.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-use-vma_iter_clear_gfp-in-nommu.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: "Liam R. Howlett" <Liam.Howlett@xxxxxxxxxx>
Subject: mm: use vma_iter_clear_gfp() in nommu
Date: Mon, 24 Jul 2023 14:31:51 -0400
Move the definition of vma_iter_clear_gfp() from mmap.c to internal.h so
it can be used in the nommu code. This will reduce node preallocations
in nommu.
Link: https://lkml.kernel.org/r/20230724183157.3939892-10-Liam.Howlett@xxxxxxxxxx
Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Cc: Peng Zhang <zhangpeng.00@xxxxxxxxxxxxx>
Cc: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/internal.h | 12 ++++++++++++
mm/mmap.c | 12 ------------
mm/nommu.c | 12 ++++--------
3 files changed, 16 insertions(+), 20 deletions(-)
--- a/mm/internal.h~mm-use-vma_iter_clear_gfp-in-nommu
+++ a/mm/internal.h
@@ -1064,6 +1064,18 @@ static inline void vma_iter_clear(struct
mas_store_prealloc(&vmi->mas, NULL);
}
+static inline int vma_iter_clear_gfp(struct vma_iterator *vmi,
+ unsigned long start, unsigned long end, gfp_t gfp)
+{
+ vmi->mas.index = start;
+ vmi->mas.last = end - 1;
+ mas_store_gfp(&vmi->mas, NULL, gfp);
+ if (unlikely(mas_is_err(&vmi->mas)))
+ return -ENOMEM;
+
+ return 0;
+}
+
static inline struct vm_area_struct *vma_iter_load(struct vma_iterator *vmi)
{
return mas_walk(&vmi->mas);
--- a/mm/mmap.c~mm-use-vma_iter_clear_gfp-in-nommu
+++ a/mm/mmap.c
@@ -154,18 +154,6 @@ static inline struct vm_area_struct *vma
return mas_prev(&vmi->mas, min);
}
-static inline int vma_iter_clear_gfp(struct vma_iterator *vmi,
- unsigned long start, unsigned long end, gfp_t gfp)
-{
- vmi->mas.index = start;
- vmi->mas.last = end - 1;
- mas_store_gfp(&vmi->mas, NULL, gfp);
- if (unlikely(mas_is_err(&vmi->mas)))
- return -ENOMEM;
-
- return 0;
-}
-
/*
* check_brk_limits() - Use platform specific check of range & verify mlock
* limits.
--- a/mm/nommu.c~mm-use-vma_iter_clear_gfp-in-nommu
+++ a/mm/nommu.c
@@ -1396,17 +1396,13 @@ static int vmi_shrink_vma(struct vma_ite
/* adjust the VMA's pointers, which may reposition it in the MM's tree
* and list */
- if (vma_iter_prealloc(vmi)) {
- pr_warn("Allocation of vma tree for process %d failed\n",
- current->pid);
- return -ENOMEM;
- }
-
if (from > vma->vm_start) {
- vma_iter_clear(vmi, from, vma->vm_end);
+ if (vma_iter_clear_gfp(vmi, from, vma->vm_end, GFP_KERNEL))
+ return -ENOMEM;
vma->vm_end = from;
} else {
- vma_iter_clear(vmi, vma->vm_start, to);
+ if (vma_iter_clear_gfp(vmi, vma->vm_start, to, GFP_KERNEL))
+ return -ENOMEM;
vma->vm_start = to;
}
_
Patches currently in -mm which might be from Liam.Howlett@xxxxxxxxxx are
mm-mmap-clean-up-validate_mm-calls.patch
maple_tree-relax-lockdep-checks-for-on-stack-trees.patch
mm-mmap-change-detached-vma-locking-scheme.patch
maple_tree-be-more-strict-about-locking.patch
maple_tree-add-benchmarking-for-mas_for_each.patch
maple_tree-add-benchmarking-for-mas_prev.patch
mm-change-do_vmi_align_munmap-tracking-of-vmas-to-remove.patch
mm-remove-prev-check-from-do_vmi_align_munmap.patch
maple_tree-introduce-__mas_set_range.patch
mm-remove-re-walk-from-mmap_region.patch
maple_tree-re-introduce-entry-to-mas_preallocate-arguments.patch
maple_tree-adjust-node-allocation-on-mas_rebalance.patch
mm-use-vma_iter_clear_gfp-in-nommu.patch
mm-set-up-vma-iterator-for-vma_iter_prealloc-calls.patch
maple_tree-move-mas_wr_end_piv-below-mas_wr_extend_null.patch
maple_tree-update-mas_preallocate-testing.patch
maple_tree-refine-mas_preallocate-node-calculations.patch
maple_tree-reduce-resets-during-store-setup.patch
mm-mmap-change-vma-iteration-order-in-do_vmi_align_munmap.patch
