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Subject[PATCH v3 hmm 11/11] mm/mmu_notifiers: remove unregister_no_release
Date
From: Jason Gunthorpe <jgg@mellanox.com>

mmu_notifier_unregister_no_release() and mmu_notifier_call_srcu() no
longer have any users, they have all been converted to use
mmu_notifier_put().

So delete this difficult to use interface.

Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
---
include/linux/mmu_notifier.h | 5 -----
mm/mmu_notifier.c | 31 -------------------------------
2 files changed, 36 deletions(-)

diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h
index 31aa971315a142..52929e5ef70826 100644
--- a/include/linux/mmu_notifier.h
+++ b/include/linux/mmu_notifier.h
@@ -271,8 +271,6 @@ extern int __mmu_notifier_register(struct mmu_notifier *mn,
struct mm_struct *mm);
extern void mmu_notifier_unregister(struct mmu_notifier *mn,
struct mm_struct *mm);
-extern void mmu_notifier_unregister_no_release(struct mmu_notifier *mn,
- struct mm_struct *mm);
extern void __mmu_notifier_mm_destroy(struct mm_struct *mm);
extern void __mmu_notifier_release(struct mm_struct *mm);
extern int __mmu_notifier_clear_flush_young(struct mm_struct *mm,
@@ -513,9 +511,6 @@ static inline void mmu_notifier_range_init(struct mmu_notifier_range *range,
set_pte_at(___mm, ___address, __ptep, ___pte); \
})

-extern void mmu_notifier_call_srcu(struct rcu_head *rcu,
- void (*func)(struct rcu_head *rcu));
-
#else /* CONFIG_MMU_NOTIFIER */

struct mmu_notifier_range {
diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c
index 4a770b5211b71d..2ec48f8ba9e288 100644
--- a/mm/mmu_notifier.c
+++ b/mm/mmu_notifier.c
@@ -21,18 +21,6 @@
/* global SRCU for all MMs */
DEFINE_STATIC_SRCU(srcu);

-/*
- * This function allows mmu_notifier::release callback to delay a call to
- * a function that will free appropriate resources. The function must be
- * quick and must not block.
- */
-void mmu_notifier_call_srcu(struct rcu_head *rcu,
- void (*func)(struct rcu_head *rcu))
-{
- call_srcu(&srcu, rcu, func);
-}
-EXPORT_SYMBOL_GPL(mmu_notifier_call_srcu);
-
/*
* This function can't run concurrently against mmu_notifier_register
* because mm->mm_users > 0 during mmu_notifier_register and exit_mmap
@@ -453,25 +441,6 @@ void mmu_notifier_unregister(struct mmu_notifier *mn, struct mm_struct *mm)
}
EXPORT_SYMBOL_GPL(mmu_notifier_unregister);

-/*
- * Same as mmu_notifier_unregister but no callback and no srcu synchronization.
- */
-void mmu_notifier_unregister_no_release(struct mmu_notifier *mn,
- struct mm_struct *mm)
-{
- spin_lock(&mm->mmu_notifier_mm->lock);
- /*
- * Can not use list_del_rcu() since __mmu_notifier_release
- * can delete it before we hold the lock.
- */
- hlist_del_init_rcu(&mn->hlist);
- spin_unlock(&mm->mmu_notifier_mm->lock);
-
- BUG_ON(atomic_read(&mm->mm_count) <= 0);
- mmdrop(mm);
-}
-EXPORT_SYMBOL_GPL(mmu_notifier_unregister_no_release);
-
static void mmu_notifier_free_rcu(struct rcu_head *rcu)
{
struct mmu_notifier *mn = container_of(rcu, struct mmu_notifier, rcu);
--
2.22.0
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