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hmm related patches for 5.6

Browse source 
This small series revises the names in mmu_notifier to make the code
 clearer and more readable.
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Merge tag 'for-linus-hmm' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma

Pull mmu_notifier updates from Jason Gunthorpe:
 "This small series revises the names in mmu_notifier to make the code
  clearer and more readable"

* tag 'for-linus-hmm' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma:
  mm/mmu_notifiers: Use 'interval_sub' as the variable for mmu_interval_notifier
  mm/mmu_notifiers: Use 'subscription' as the variable name for mmu_notifier
  mm/mmu_notifier: Rename struct mmu_notifier_mm to mmu_notifier_subscriptions
This commit is contained in:
Linus Torvalds 2020-01-29 19:56:50 -08:00
commit 39bed42de2
6 changed files with 375 additions and 326 deletions
Download patch file Download diff file Expand all files Collapse all files

2
include/linux/mm_types.h
View file

@ -490,7 +490,7 @@ struct mm_struct {
/* store ref to file /proc/<pid>/exe symlink points to */
struct file __rcu *exe_file;
#ifdef CONFIG_MMU_NOTIFIER
struct mmu_notifier_mm *mmu_notifier_mm;
struct mmu_notifier_subscriptions *notifier_subscriptions;
#endif
#if defined(CONFIG_TRANSPARENT_HUGEPAGE) && !USE_SPLIT_PMD_PTLOCKS
pgtable_t pmd_huge_pte; /* protected by page_table_lock */

86
include/linux/mmu_notifier.h
View file

@ -8,7 +8,7 @@
#include <linux/srcu.h>
#include <linux/interval_tree.h>
struct mmu_notifier_mm;
struct mmu_notifier_subscriptions;
struct mmu_notifier;
struct mmu_notifier_range;
struct mmu_interval_notifier;
@ -73,7 +73,7 @@ struct mmu_notifier_ops {
* through the gart alias address, so leading to memory
* corruption.
*/
void (*release)(struct mmu_notifier *mn,
void (*release)(struct mmu_notifier *subscription,
struct mm_struct *mm);
/*
@ -85,7 +85,7 @@ struct mmu_notifier_ops {
* Start-end is necessary in case the secondary MMU is mapping the page
* at a smaller granularity than the primary MMU.
*/
int (*clear_flush_young)(struct mmu_notifier *mn,
int (*clear_flush_young)(struct mmu_notifier *subscription,
struct mm_struct *mm,
unsigned long start,
unsigned long end);
@ -95,7 +95,7 @@ struct mmu_notifier_ops {
* latter, it is supposed to test-and-clear the young/accessed bitflag
* in the secondary pte, but it may omit flushing the secondary tlb.
*/
int (*clear_young)(struct mmu_notifier *mn,
int (*clear_young)(struct mmu_notifier *subscription,
struct mm_struct *mm,
unsigned long start,
unsigned long end);
@ -106,7 +106,7 @@ struct mmu_notifier_ops {
* frequently used without actually clearing the flag or tearing
* down the secondary mapping on the page.
*/
int (*test_young)(struct mmu_notifier *mn,
int (*test_young)(struct mmu_notifier *subscription,
struct mm_struct *mm,
unsigned long address);
@ -114,7 +114,7 @@ struct mmu_notifier_ops {
* change_pte is called in cases that pte mapping to page is changed:
* for example, when ksm remaps pte to point to a new shared page.
*/
void (*change_pte)(struct mmu_notifier *mn,
void (*change_pte)(struct mmu_notifier *subscription,
struct mm_struct *mm,
unsigned long address,
pte_t pte);
@ -169,9 +169,9 @@ struct mmu_notifier_ops {
* invalidate_range_end.
*
*/
int (*invalidate_range_start)(struct mmu_notifier *mn,
int (*invalidate_range_start)(struct mmu_notifier *subscription,
const struct mmu_notifier_range *range);
void (*invalidate_range_end)(struct mmu_notifier *mn,
void (*invalidate_range_end)(struct mmu_notifier *subscription,
const struct mmu_notifier_range *range);
/*
@ -192,8 +192,10 @@ struct mmu_notifier_ops {
* of what was passed to invalidate_range_start()/end(), if
* called between those functions.
*/
void (*invalidate_range)(struct mmu_notifier *mn, struct mm_struct *mm,
unsigned long start, unsigned long end);
void (*invalidate_range)(struct mmu_notifier *subscription,
struct mm_struct *mm,
unsigned long start,
unsigned long end);
/*
* These callbacks are used with the get/put interface to manage the
@ -206,7 +208,7 @@ struct mmu_notifier_ops {
* and cannot sleep.
*/
struct mmu_notifier *(*alloc_notifier)(struct mm_struct *mm);
void (*free_notifier)(struct mmu_notifier *mn);
void (*free_notifier)(struct mmu_notifier *subscription);
};
/*
@ -235,7 +237,7 @@ struct mmu_notifier {
* was required but mmu_notifier_range_blockable(range) is false.
*/
struct mmu_interval_notifier_ops {
bool (*invalidate)(struct mmu_interval_notifier *mni,
bool (*invalidate)(struct mmu_interval_notifier *interval_sub,
const struct mmu_notifier_range *range,
unsigned long cur_seq);
};
@ -265,7 +267,7 @@ struct mmu_notifier_range {
static inline int mm_has_notifiers(struct mm_struct *mm)
{
return unlikely(mm->mmu_notifier_mm);
return unlikely(mm->notifier_subscriptions);
}
struct mmu_notifier *mmu_notifier_get_locked(const struct mmu_notifier_ops *ops,
@ -280,30 +282,31 @@ mmu_notifier_get(const struct mmu_notifier_ops *ops, struct mm_struct *mm)
up_write(&mm->mmap_sem);
return ret;
}
void mmu_notifier_put(struct mmu_notifier *mn);
void mmu_notifier_put(struct mmu_notifier *subscription);
void mmu_notifier_synchronize(void);
extern int mmu_notifier_register(struct mmu_notifier *mn,
extern int mmu_notifier_register(struct mmu_notifier *subscription,
struct mm_struct *mm);
extern int __mmu_notifier_register(struct mmu_notifier *mn,
extern int __mmu_notifier_register(struct mmu_notifier *subscription,
struct mm_struct *mm);
extern void mmu_notifier_unregister(struct mmu_notifier *mn,
extern void mmu_notifier_unregister(struct mmu_notifier *subscription,
struct mm_struct *mm);
unsigned long mmu_interval_read_begin(struct mmu_interval_notifier *mni);
int mmu_interval_notifier_insert(struct mmu_interval_notifier *mni,
unsigned long
mmu_interval_read_begin(struct mmu_interval_notifier *interval_sub);
int mmu_interval_notifier_insert(struct mmu_interval_notifier *interval_sub,
struct mm_struct *mm, unsigned long start,
unsigned long length,
const struct mmu_interval_notifier_ops *ops);
int mmu_interval_notifier_insert_locked(
struct mmu_interval_notifier *mni, struct mm_struct *mm,
struct mmu_interval_notifier *interval_sub, struct mm_struct *mm,
unsigned long start, unsigned long length,
const struct mmu_interval_notifier_ops *ops);
void mmu_interval_notifier_remove(struct mmu_interval_notifier *mni);
void mmu_interval_notifier_remove(struct mmu_interval_notifier *interval_sub);
/**
* mmu_interval_set_seq - Save the invalidation sequence
* @mni - The mni passed to invalidate
* @interval_sub - The subscription passed to invalidate
* @cur_seq - The cur_seq passed to the invalidate() callback
*
* This must be called unconditionally from the invalidate callback of a
@ -314,15 +317,16 @@ void mmu_interval_notifier_remove(struct mmu_interval_notifier *mni);
* If the caller does not call mmu_interval_read_begin() or
* mmu_interval_read_retry() then this call is not required.
*/
static inline void mmu_interval_set_seq(struct mmu_interval_notifier *mni,
unsigned long cur_seq)
static inline void
mmu_interval_set_seq(struct mmu_interval_notifier *interval_sub,
unsigned long cur_seq)
{
WRITE_ONCE(mni->invalidate_seq, cur_seq);
WRITE_ONCE(interval_sub->invalidate_seq, cur_seq);
}
/**
* mmu_interval_read_retry - End a read side critical section against a VA range
* mni: The range
* interval_sub: The subscription
* seq: The return of the paired mmu_interval_read_begin()
*
* This MUST be called under a user provided lock that is also held
@ -334,15 +338,16 @@ static inline void mmu_interval_set_seq(struct mmu_interval_notifier *mni,
* Returns true if an invalidation collided with this critical section, and
* the caller should retry.
*/
static inline bool mmu_interval_read_retry(struct mmu_interval_notifier *mni,
unsigned long seq)
static inline bool
mmu_interval_read_retry(struct mmu_interval_notifier *interval_sub,
unsigned long seq)
{
return mni->invalidate_seq != seq;
return interval_sub->invalidate_seq != seq;
}
/**
* mmu_interval_check_retry - Test if a collision has occurred
* mni: The range
* interval_sub: The subscription
* seq: The return of the matching mmu_interval_read_begin()
*
* This can be used in the critical section between mmu_interval_read_begin()
@ -357,14 +362,15 @@ static inline bool mmu_interval_read_retry(struct mmu_interval_notifier *mni,
* This call can be used as part of loops and other expensive operations to
* expedite a retry.
*/
static inline bool mmu_interval_check_retry(struct mmu_interval_notifier *mni,
unsigned long seq)
static inline bool
mmu_interval_check_retry(struct mmu_interval_notifier *interval_sub,
unsigned long seq)
{
/* Pairs with the WRITE_ONCE in mmu_interval_set_seq() */
return READ_ONCE(mni->invalidate_seq) != seq;
return READ_ONCE(interval_sub->invalidate_seq) != seq;
}
extern void __mmu_notifier_mm_destroy(struct mm_struct *mm);
extern void __mmu_notifier_subscriptions_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,
unsigned long start,
@ -480,15 +486,15 @@ static inline void mmu_notifier_invalidate_range(struct mm_struct *mm,
__mmu_notifier_invalidate_range(mm, start, end);
}
static inline void mmu_notifier_mm_init(struct mm_struct *mm)
static inline void mmu_notifier_subscriptions_init(struct mm_struct *mm)
{
mm->mmu_notifier_mm = NULL;
mm->notifier_subscriptions = NULL;
}
static inline void mmu_notifier_mm_destroy(struct mm_struct *mm)
static inline void mmu_notifier_subscriptions_destroy(struct mm_struct *mm)
{
if (mm_has_notifiers(mm))
__mmu_notifier_mm_destroy(mm);
__mmu_notifier_subscriptions_destroy(mm);
}
@ -692,11 +698,11 @@ static inline void mmu_notifier_invalidate_range(struct mm_struct *mm,
{
}
static inline void mmu_notifier_mm_init(struct mm_struct *mm)
static inline void mmu_notifier_subscriptions_init(struct mm_struct *mm)
{
}
static inline void mmu_notifier_mm_destroy(struct mm_struct *mm)
static inline void mmu_notifier_subscriptions_destroy(struct mm_struct *mm)
{
}