+ txt-mm-khugepaged-write-lock-vma-while-collapsing-a-huge-page-fix-fix.patch added to mm-unstable branch

+ txt-mm-khugepaged-write-lock-vma-while-collapsing-a-huge-page-fix-fix.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: txt-mm-khugepaged-write-lock-vma-while-collapsing-a-huge-page-fix-fix
has been added to the -mm mm-unstable branch.  Its filename is
     txt-mm-khugepaged-write-lock-vma-while-collapsing-a-huge-page-fix-fix.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/txt-mm-khugepaged-write-lock-vma-while-collapsing-a-huge-page-fix-fix.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: Suren Baghdasaryan <surenb@google.com>
Subject: txt-mm-khugepaged-write-lock-vma-while-collapsing-a-huge-page-fix-fix
Date: Sat, 4 Mar 2023 15:24:15 -0800

I missed vma_try_start_write() definition for CONFIG_PER_VMA_LOCK=n
configuration.

Link: https://lkml.kernel.org/r/CAJuCfpFjWhtzRE1X=J+_JjgJzNKhq-=JT8yTBSTHthwp0pqWZw@mail.gmail.com
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---


--- a/include/linux/mm.h~txt-mm-khugepaged-write-lock-vma-while-collapsing-a-huge-page-fix-fix
+++ a/include/linux/mm.h
@@ -717,6 +717,8 @@ static inline bool vma_start_read(struct
 		{ return false; }
 static inline void vma_end_read(struct vm_area_struct *vma) {}
 static inline void vma_start_write(struct vm_area_struct *vma) {}
+static inline bool vma_try_start_write(struct vm_area_struct *vma)
+		{ return true; }
 static inline void vma_assert_write_locked(struct vm_area_struct *vma) {}
 
 #endif /* CONFIG_PER_VMA_LOCK */
_

Patches currently in -mm which might be from surenb@google.com are

mm-introduce-config_per_vma_lock.patch
mm-move-mmap_lock-assert-function-definitions.patch
mm-add-per-vma-lock-and-helper-functions-to-control-it.patch
mm-mark-vma-as-being-written-when-changing-vm_flags.patch
mm-mmap-move-vma_prepare-before-vma_adjust_trans_huge.patch
mm-khugepaged-write-lock-vma-while-collapsing-a-huge-page.patch
mm-khugepaged-write-lock-vma-while-collapsing-a-huge-page-fix.patch
txt-mm-khugepaged-write-lock-vma-while-collapsing-a-huge-page-fix-fix.patch
mm-mmap-write-lock-vmas-in-vma_prepare-before-modifying-them.patch
mm-mmap-write-lock-vmas-in-vma_prepare-before-modifying-them-fix.patch
mm-mremap-write-lock-vma-while-remapping-it-to-a-new-address-range.patch
mm-write-lock-vmas-before-removing-them-from-vma-tree.patch
mm-write-lock-vmas-before-removing-them-from-vma-tree-fix.patch
mm-conditionally-write-lock-vma-in-free_pgtables.patch
kernel-fork-assert-no-vma-readers-during-its-destruction.patch
mm-mmap-prevent-pagefault-handler-from-racing-with-mmu_notifier-registration.patch
mm-introduce-vma-detached-flag.patch
mm-introduce-lock_vma_under_rcu-to-be-used-from-arch-specific-code.patch
mm-fall-back-to-mmap_lock-if-vma-anon_vma-is-not-yet-set.patch
mm-add-fault_flag_vma_lock-flag.patch
mm-add-fault_flag_vma_lock-flag-fix.patch
mm-prevent-do_swap_page-from-handling-page-faults-under-vma-lock.patch
mm-prevent-userfaults-to-be-handled-under-per-vma-lock.patch
mm-introduce-per-vma-lock-statistics.patch
x86-mm-try-vma-lock-based-page-fault-handling-first.patch
arm64-mm-try-vma-lock-based-page-fault-handling-first.patch
mm-mmap-free-vm_area_struct-without-call_rcu-in-exit_mmap.patch
mm-separate-vma-lock-from-vm_area_struct.patch