+ mm-mmu_notifier-remove-unused-mmu_notifier_range_update_to_read_only-export.patch added to mm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: mm/mmu_notifier: remove unused mmu_notifier_range_update_to_read_only export
has been added to the -mm mm-unstable branch.  Its filename is
     mm-mmu_notifier-remove-unused-mmu_notifier_range_update_to_read_only-export.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-mmu_notifier-remove-unused-mmu_notifier_range_update_to_read_only-export.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: Alistair Popple <apopple@nvidia.com>
Subject: mm/mmu_notifier: remove unused mmu_notifier_range_update_to_read_only export
Date: Mon, 9 Jan 2023 12:22:07 +1100

mmu_notifier_range_update_to_read_only() was originally introduced in
commit c6d23413f81b ("mm/mmu_notifier:
mmu_notifier_range_update_to_read_only() helper") as an optimisation for
device drivers that know a range has only been mapped read-only.  However
there are no users of this feature so remove it.  As it is the only user
of the struct mmu_notifier_range.vma field remove that also.

Link: https://lkml.kernel.org/r/20230109012207.79457-1-apopple@nvidia.com
Signed-off-by: Alistair Popple <apopple@nvidia.com>
Acked-by: Mike Rapoport (IBM) <rppt@kernel.org>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/mmu_notifier.h |    2 --
 mm/mmu_notifier.c            |   10 ----------
 2 files changed, 12 deletions(-)

--- a/include/linux/mmu_notifier.h~mm-mmu_notifier-remove-unused-mmu_notifier_range_update_to_read_only-export
+++ a/include/linux/mmu_notifier.h
@@ -269,7 +269,6 @@ extern struct lockdep_map __mmu_notifier
 #endif
 
 struct mmu_notifier_range {
-	struct vm_area_struct *vma;
 	struct mm_struct *mm;
 	unsigned long start;
 	unsigned long end;
@@ -519,7 +518,6 @@ static inline void mmu_notifier_range_in
 					   unsigned long start,
 					   unsigned long end)
 {
-	range->vma = vma;
 	range->event = event;
 	range->mm = mm;
 	range->start = start;
--- a/mm/mmu_notifier.c~mm-mmu_notifier-remove-unused-mmu_notifier_range_update_to_read_only-export
+++ a/mm/mmu_notifier.c
@@ -1120,13 +1120,3 @@ void mmu_notifier_synchronize(void)
 	synchronize_srcu(&srcu);
 }
 EXPORT_SYMBOL_GPL(mmu_notifier_synchronize);
-
-bool
-mmu_notifier_range_update_to_read_only(const struct mmu_notifier_range *range)
-{
-	if (!range->vma || range->event != MMU_NOTIFY_PROTECTION_VMA)
-		return false;
-	/* Return true if the vma still have the read flag set. */
-	return range->vma->vm_flags & VM_READ;
-}
-EXPORT_SYMBOL_GPL(mmu_notifier_range_update_to_read_only);
_

Patches currently in -mm which might be from apopple@nvidia.com are

mm-mmu_notifier-remove-unused-mmu_notifier_range_update_to_read_only-export.patch