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mm/mmu_notifiers: remove unregister_no_release

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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.

Link: https://lore.kernel.org/r/20190806231548.25242-12-jgg@ziepe.ca
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ralph Campbell <rcampbell@nvidia.com>
Tested-by: Ralph Campbell <rcampbell@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Jason Gunthorpe 2019-08-06 20:15:48 -03:00
parent 47f725ee7b
commit c96245148c
2 changed files with 0 additions and 36 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
include/linux/mmu_notifier.h
View File

@ -271,8 +271,6 @@ extern int __mmu_notifier_register(struct mmu_notifier *mn,
struct mm_struct *mm); struct mm_struct *mm);
extern void mmu_notifier_unregister(struct mmu_notifier *mn, extern void mmu_notifier_unregister(struct mmu_notifier *mn,
struct mm_struct *mm); 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_mm_destroy(struct mm_struct *mm);
extern void __mmu_notifier_release(struct mm_struct *mm); extern void __mmu_notifier_release(struct mm_struct *mm);
extern int __mmu_notifier_clear_flush_young(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); \ 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 */ #else /* CONFIG_MMU_NOTIFIER */
struct mmu_notifier_range { struct mmu_notifier_range {

31
mm/mmu_notifier.c
View File

@ -21,18 +21,6 @@
/* global SRCU for all MMs */ /* global SRCU for all MMs */
DEFINE_STATIC_SRCU(srcu); 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 * This function can't run concurrently against mmu_notifier_register
* because mm->mm_users > 0 during mmu_notifier_register and exit_mmap * because mm->mm_users > 0 during mmu_notifier_register and exit_mmap
@ -455,25 +443,6 @@ void mmu_notifier_unregister(struct mmu_notifier *mn, struct mm_struct *mm)
} }
EXPORT_SYMBOL_GPL(mmu_notifier_unregister); 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) static void mmu_notifier_free_rcu(struct rcu_head *rcu)
{ {
struct mmu_notifier *mn = container_of(rcu, struct mmu_notifier, rcu); struct mmu_notifier *mn = container_of(rcu, struct mmu_notifier, rcu);