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@xxxxxxxxxx>
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@xxxxxxxxxx
Signed-off-by: Alistair Popple <apopple@xxxxxxxxxx>
Acked-by: Mike Rapoport (IBM) <rppt@xxxxxxxxxx>
Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Ira Weiny <ira.weiny@xxxxxxxxx>
Cc: Jerome Glisse <jglisse@xxxxxxxxxx>
Cc: John Hubbard <jhubbard@xxxxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Ralph Campbell <rcampbell@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
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@xxxxxxxxxx are
mm-mmu_notifier-remove-unused-mmu_notifier_range_update_to_read_only-export.patch
