From: Michel Lespinasse <walken@google.com>
To: Andrew Morton <akpm@linux-foundation.org>, linux-mm <linux-mm@kvack.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Laurent Dufour <ldufour@linux.ibm.com>,
Vlastimil Babka <vbabka@suse.cz>,
Matthew Wilcox <willy@infradead.org>,
Liam Howlett <Liam.Howlett@oracle.com>,
Jerome Glisse <jglisse@redhat.com>,
Davidlohr Bueso <dave@stgolabs.net>,
David Rientjes <rientjes@google.com>,
Hugh Dickins <hughd@google.com>, Ying Han <yinghan@google.com>,
Jason Gunthorpe <jgg@ziepe.ca>,
Daniel Jordan <daniel.m.jordan@oracle.com>,
John Hubbard <jhubbard@nvidia.com>,
Michel Lespinasse <walken@google.com>
Subject: [PATCH v6 10/12] mmap locking API: rename mmap_sem to mmap_lock
Date: Tue, 19 May 2020 22:29:06 -0700 [thread overview]
Message-ID: <20200520052908.204642-11-walken@google.com> (raw)
In-Reply-To: <20200520052908.204642-1-walken@google.com>
Rename the mmap_sem field to mmap_lock. Any new uses of this lock
should now go through the new mmap locking api. The mmap_lock is
still implemented as a rwsem, though this could change in the future.
Signed-off-by: Michel Lespinasse <walken@google.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
---
arch/ia64/mm/fault.c | 4 +--
arch/x86/mm/fault.c | 2 +-
drivers/gpu/drm/etnaviv/etnaviv_gem.c | 2 +-
include/linux/mm_types.h | 2 +-
include/linux/mmap_lock.h | 38 +++++++++++++--------------
mm/memory.c | 2 +-
mm/mmap.c | 4 +--
mm/mmu_notifier.c | 2 +-
8 files changed, 28 insertions(+), 28 deletions(-)
diff --git a/arch/ia64/mm/fault.c b/arch/ia64/mm/fault.c
index 693f00b117e1..9b95050c2048 100644
--- a/arch/ia64/mm/fault.c
+++ b/arch/ia64/mm/fault.c
@@ -70,8 +70,8 @@ ia64_do_page_fault (unsigned long address, unsigned long isr, struct pt_regs *re
mask = ((((isr >> IA64_ISR_X_BIT) & 1UL) << VM_EXEC_BIT)
| (((isr >> IA64_ISR_W_BIT) & 1UL) << VM_WRITE_BIT));
- /* mmap_sem is performance critical.... */
- prefetchw(&mm->mmap_sem);
+ /* mmap_lock is performance critical.... */
+ prefetchw(&mm->mmap_lock);
/*
* If we're in an interrupt or have no user context, we must not take the fault..
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 181f66b9049f..35f530f9dfc0 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -1522,7 +1522,7 @@ dotraplinkage void
do_page_fault(struct pt_regs *regs, unsigned long hw_error_code,
unsigned long address)
{
- prefetchw(¤t->mm->mmap_sem);
+ prefetchw(¤t->mm->mmap_lock);
trace_page_fault_entries(regs, hw_error_code, address);
if (unlikely(kmmio_fault(regs, address)))
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem.c b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
index dc9ef302f517..701f3995f621 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gem.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
@@ -661,7 +661,7 @@ static int etnaviv_gem_userptr_get_pages(struct etnaviv_gem_object *etnaviv_obj)
struct etnaviv_gem_userptr *userptr = &etnaviv_obj->userptr;
int ret, pinned = 0, npages = etnaviv_obj->base.size >> PAGE_SHIFT;
- might_lock_read(¤t->mm->mmap_sem);
+ might_lock_read(¤t->mm->mmap_lock);
if (userptr->mm != current->mm)
return -EPERM;
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 4aba6c0c2ba8..d13b90399c16 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -436,7 +436,7 @@ struct mm_struct {
spinlock_t page_table_lock; /* Protects page tables and some
* counters
*/
- struct rw_semaphore mmap_sem;
+ struct rw_semaphore mmap_lock;
struct list_head mmlist; /* List of maybe swapped mm's. These
* are globally strung together off
diff --git a/include/linux/mmap_lock.h b/include/linux/mmap_lock.h
index 43ef914e6468..b5bd86778cca 100644
--- a/include/linux/mmap_lock.h
+++ b/include/linux/mmap_lock.h
@@ -4,67 +4,67 @@
#include <linux/mmdebug.h>
#define MMAP_LOCK_INITIALIZER(name) \
- .mmap_sem = __RWSEM_INITIALIZER((name).mmap_sem),
+ .mmap_lock = __RWSEM_INITIALIZER((name).mmap_lock),
static inline void mmap_init_lock(struct mm_struct *mm)
{
- init_rwsem(&mm->mmap_sem);
+ init_rwsem(&mm->mmap_lock);
}
static inline void mmap_write_lock(struct mm_struct *mm)
{
- down_write(&mm->mmap_sem);
+ down_write(&mm->mmap_lock);
}
static inline void mmap_write_lock_nested(struct mm_struct *mm, int subclass)
{
- down_write_nested(&mm->mmap_sem, subclass);
+ down_write_nested(&mm->mmap_lock, subclass);
}
static inline int mmap_write_lock_killable(struct mm_struct *mm)
{
- return down_write_killable(&mm->mmap_sem);
+ return down_write_killable(&mm->mmap_lock);
}
static inline bool mmap_write_trylock(struct mm_struct *mm)
{
- return down_write_trylock(&mm->mmap_sem) != 0;
+ return down_write_trylock(&mm->mmap_lock) != 0;
}
static inline void mmap_write_unlock(struct mm_struct *mm)
{
- up_write(&mm->mmap_sem);
+ up_write(&mm->mmap_lock);
}
static inline void mmap_write_downgrade(struct mm_struct *mm)
{
- downgrade_write(&mm->mmap_sem);
+ downgrade_write(&mm->mmap_lock);
}
static inline void mmap_read_lock(struct mm_struct *mm)
{
- down_read(&mm->mmap_sem);
+ down_read(&mm->mmap_lock);
}
static inline int mmap_read_lock_killable(struct mm_struct *mm)
{
- return down_read_killable(&mm->mmap_sem);
+ return down_read_killable(&mm->mmap_lock);
}
static inline bool mmap_read_trylock(struct mm_struct *mm)
{
- return down_read_trylock(&mm->mmap_sem) != 0;
+ return down_read_trylock(&mm->mmap_lock) != 0;
}
static inline void mmap_read_unlock(struct mm_struct *mm)
{
- up_read(&mm->mmap_sem);
+ up_read(&mm->mmap_lock);
}
static inline bool mmap_read_trylock_non_owner(struct mm_struct *mm)
{
- if (down_read_trylock(&mm->mmap_sem)) {
- rwsem_release(&mm->mmap_sem.dep_map, _RET_IP_);
+ if (down_read_trylock(&mm->mmap_lock)) {
+ rwsem_release(&mm->mmap_lock.dep_map, _RET_IP_);
return true;
}
return false;
@@ -72,19 +72,19 @@ static inline bool mmap_read_trylock_non_owner(struct mm_struct *mm)
static inline void mmap_read_unlock_non_owner(struct mm_struct *mm)
{
- up_read_non_owner(&mm->mmap_sem);
+ up_read_non_owner(&mm->mmap_lock);
}
static inline void mmap_assert_locked(struct mm_struct *mm)
{
- lockdep_assert_held(&mm->mmap_sem);
- VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_sem), mm);
+ lockdep_assert_held(&mm->mmap_lock);
+ VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_lock), mm);
}
static inline void mmap_assert_write_locked(struct mm_struct *mm)
{
- lockdep_assert_held_write(&mm->mmap_sem);
- VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_sem), mm);
+ lockdep_assert_held_write(&mm->mmap_lock);
+ VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_lock), mm);
}
#endif /* _LINUX_MMAP_LOCK_H */
diff --git a/mm/memory.c b/mm/memory.c
index 20f98ea8968e..c2963e7affa9 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -4811,7 +4811,7 @@ void __might_fault(const char *file, int line)
__might_sleep(file, line, 0);
#if defined(CONFIG_DEBUG_ATOMIC_SLEEP)
if (current->mm)
- might_lock_read(¤t->mm->mmap_sem);
+ might_lock_read(¤t->mm->mmap_lock);
#endif
}
EXPORT_SYMBOL(__might_fault);
diff --git a/mm/mmap.c b/mm/mmap.c
index 2f4ffccc5972..80a47031d5db 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -3474,7 +3474,7 @@ static void vm_lock_anon_vma(struct mm_struct *mm, struct anon_vma *anon_vma)
* The LSB of head.next can't change from under us
* because we hold the mm_all_locks_mutex.
*/
- down_write_nest_lock(&anon_vma->root->rwsem, &mm->mmap_sem);
+ down_write_nest_lock(&anon_vma->root->rwsem, &mm->mmap_lock);
/*
* We can safely modify head.next after taking the
* anon_vma->root->rwsem. If some other vma in this mm shares
@@ -3504,7 +3504,7 @@ static void vm_lock_mapping(struct mm_struct *mm, struct address_space *mapping)
*/
if (test_and_set_bit(AS_MM_ALL_LOCKS, &mapping->flags))
BUG();
- down_write_nest_lock(&mapping->i_mmap_rwsem, &mm->mmap_sem);
+ down_write_nest_lock(&mapping->i_mmap_rwsem, &mm->mmap_lock);
}
}
diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c
index 24eb9d1ed0a7..2f348b6c9c9a 100644
--- a/mm/mmu_notifier.c
+++ b/mm/mmu_notifier.c
@@ -983,7 +983,7 @@ int mmu_interval_notifier_insert(struct mmu_interval_notifier *interval_sub,
struct mmu_notifier_subscriptions *subscriptions;
int ret;
- might_lock(&mm->mmap_sem);
+ might_lock(&mm->mmap_lock);
subscriptions = smp_load_acquire(&mm->notifier_subscriptions);
if (!subscriptions || !subscriptions->has_itree) {
--
2.26.2.761.g0e0b3e54be-goog
next prev parent reply other threads:[~2020-05-20 5:29 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-20 5:28 [PATCH v6 00/12] Add a new mmap locking API wrapping mmap_sem calls Michel Lespinasse
2020-05-20 5:28 ` [PATCH v6 01/12] mmap locking API: initial implementation as rwsem wrappers Michel Lespinasse
2020-05-20 5:28 ` [PATCH v6 02/12] MMU notifier: use the new mmap locking API Michel Lespinasse
2020-05-20 5:28 ` [PATCH v6 03/12] DMA reservations: " Michel Lespinasse
2020-05-20 5:29 ` [PATCH v6 04/12] mmap locking API: use coccinelle to convert mmap_sem rwsem call sites Michel Lespinasse
2020-05-20 5:29 ` [PATCH v6 05/12] mmap locking API: convert mmap_sem call sites missed by coccinelle Michel Lespinasse
2020-05-21 3:23 ` Andrew Morton
2020-05-21 4:49 ` Michel Lespinasse
2020-05-20 5:29 ` [PATCH v6 06/12] mmap locking API: convert nested write lock sites Michel Lespinasse
2020-05-20 5:29 ` [PATCH v6 07/12] mmap locking API: add mmap_read_trylock_non_owner() Michel Lespinasse
2020-05-22 14:15 ` Davidlohr Bueso
2020-05-20 5:29 ` [PATCH v6 08/12] mmap locking API: add MMAP_LOCK_INITIALIZER Michel Lespinasse
2020-05-29 20:17 ` Daniel Jordan
2020-05-20 5:29 ` [PATCH v6 09/12] mmap locking API: add mmap_assert_locked() and mmap_assert_write_locked() Michel Lespinasse
2020-05-21 7:35 ` Vlastimil Babka
2020-05-29 20:36 ` Daniel Jordan
2020-05-20 5:29 ` Michel Lespinasse [this message]
2020-05-22 14:16 ` [PATCH v6 10/12] mmap locking API: rename mmap_sem to mmap_lock Davidlohr Bueso
2020-05-29 20:42 ` Daniel Jordan
2020-05-20 5:29 ` [PATCH v6 11/12] mmap locking API: convert mmap_sem API comments Michel Lespinasse
2020-05-21 7:38 ` Vlastimil Babka
2020-05-22 14:13 ` Davidlohr Bueso
2020-05-29 20:50 ` Daniel Jordan
2020-05-20 5:29 ` [PATCH v6 12/12] mmap locking API: convert mmap_sem comments Michel Lespinasse
2020-05-21 3:22 ` Andrew Morton
2020-05-21 4:51 ` Michel Lespinasse
2020-05-21 7:41 ` Vlastimil Babka
2020-05-21 7:50 ` Michel Lespinasse
2020-05-21 17:25 ` Andrew Morton
2020-05-22 14:21 ` Vlastimil Babka
2020-05-29 21:16 ` Daniel Jordan
2020-06-09 12:03 ` [PATCH v6 00/12] Add a new mmap locking API wrapping mmap_sem calls Michal Hocko
2020-06-04 4:35 [PATCH v6 10/12] mmap locking API: rename mmap_sem to mmap_lock youling 257
2020-06-04 5:57 ` Michel Lespinasse
2020-06-04 8:06 ` youling 257
2020-06-04 8:16 ` youling 257
2020-06-04 8:38 ` Michel Lespinasse
2020-06-13 4:44 ` youling 257
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