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From: Andrew Morton <akpm@linux-foundation.org>
To: akpm@linux-foundation.org, daniel.m.jordan@oracle.com,
	dbueso@suse.de, hughd@google.com, jgg@ziepe.ca,
	jglisse@redhat.com, jhubbard@nvidia.com, ldufour@linux.ibm.com,
	Liam.Howlett@oracle.com, linux-mm@kvack.org,
	mm-commits@vger.kernel.org, peterz@infradead.org,
	rientjes@google.com, torvalds@linux-foundation.org,
	vbabka@suse.cz, walken@google.com, willy@infradead.org,
	yinghan@google.com
Subject: [patch 69/93] mmap locking API: rename mmap_sem to mmap_lock
Date: Mon, 08 Jun 2020 21:33:47 -0700	[thread overview]
Message-ID: <20200609043347.O2aC6ZQoF%akpm@linux-foundation.org> (raw)
In-Reply-To: <20200608212922.5b7fa74ca3f4e2444441b7f9@linux-foundation.org>

From: Michel Lespinasse <walken@google.com>
Subject: mmap locking API: rename mmap_sem to mmap_lock

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.

[akpm@linux-foundation.org: fix it for mm-gup-might_lock_readmmap_sem-in-get_user_pages_fast.patch]
Link: http://lkml.kernel.org/r/20200520052908.204642-11-walken@google.com
Signed-off-by: Michel Lespinasse <walken@google.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Davidlohr Bueso <dbueso@suse.de>
Reviewed-by: Daniel Jordan <daniel.m.jordan@oracle.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Laurent Dufour <ldufour@linux.ibm.com>
Cc: Liam Howlett <Liam.Howlett@oracle.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ying Han <yinghan@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 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/gup.c                              |    2 -
 mm/memory.c                           |    2 -
 mm/mmap.c                             |    4 +-
 mm/mmu_notifier.c                     |    2 -
 9 files changed, 29 insertions(+), 29 deletions(-)

--- a/arch/ia64/mm/fault.c~mmap-locking-api-rename-mmap_sem-to-mmap_lock
+++ a/arch/ia64/mm/fault.c
@@ -74,8 +74,8 @@ ia64_do_page_fault (unsigned long addres
 	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..
--- a/arch/x86/mm/fault.c~mmap-locking-api-rename-mmap_sem-to-mmap_lock
+++ a/arch/x86/mm/fault.c
@@ -1359,7 +1359,7 @@ dotraplinkage void
 do_page_fault(struct pt_regs *regs, unsigned long hw_error_code,
 		unsigned long address)
 {
-	prefetchw(&current->mm->mmap_sem);
+	prefetchw(&current->mm->mmap_lock);
 	/*
 	 * KVM has two types of events that are, logically, interrupts, but
 	 * are unfortunately delivered using the #PF vector.  These events are
--- a/drivers/gpu/drm/etnaviv/etnaviv_gem.c~mmap-locking-api-rename-mmap_sem-to-mmap_lock
+++ a/drivers/gpu/drm/etnaviv/etnaviv_gem.c
@@ -661,7 +661,7 @@ static int etnaviv_gem_userptr_get_pages
 	struct etnaviv_gem_userptr *userptr = &etnaviv_obj->userptr;
 	int ret, pinned = 0, npages = etnaviv_obj->base.size >> PAGE_SHIFT;
 
-	might_lock_read(&current->mm->mmap_sem);
+	might_lock_read(&current->mm->mmap_lock);
 
 	if (userptr->mm != current->mm)
 		return -EPERM;
--- a/include/linux/mmap_lock.h~mmap-locking-api-rename-mmap_sem-to-mmap_lock
+++ a/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
 
 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 */
--- a/include/linux/mm_types.h~mmap-locking-api-rename-mmap_sem-to-mmap_lock
+++ a/include/linux/mm_types.h
@@ -440,7 +440,7 @@ 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
--- a/mm/gup.c~mmap-locking-api-rename-mmap_sem-to-mmap_lock
+++ a/mm/gup.c
@@ -2750,7 +2750,7 @@ static int internal_get_user_pages_fast(
 		return -EINVAL;
 
 	if (!(gup_flags & FOLL_FAST_ONLY))
-		might_lock_read(&current->mm->mmap_sem);
+		might_lock_read(&current->mm->mmap_lock);
 
 	start = untagged_addr(start) & PAGE_MASK;
 	addr = start;
--- a/mm/memory.c~mmap-locking-api-rename-mmap_sem-to-mmap_lock
+++ a/mm/memory.c
@@ -4804,7 +4804,7 @@ void __might_fault(const char *file, int
 	__might_sleep(file, line, 0);
 #if defined(CONFIG_DEBUG_ATOMIC_SLEEP)
 	if (current->mm)
-		might_lock_read(&current->mm->mmap_sem);
+		might_lock_read(&current->mm->mmap_lock);
 #endif
 }
 EXPORT_SYMBOL(__might_fault);
--- a/mm/mmap.c~mmap-locking-api-rename-mmap_sem-to-mmap_lock
+++ a/mm/mmap.c
@@ -3474,7 +3474,7 @@ static void vm_lock_anon_vma(struct mm_s
 		 * 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_st
 		 */
 		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);
 	}
 }
 
--- a/mm/mmu_notifier.c~mmap-locking-api-rename-mmap_sem-to-mmap_lock
+++ a/mm/mmu_notifier.c
@@ -983,7 +983,7 @@ int mmu_interval_notifier_insert(struct
 	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) {
_


  parent reply	other threads:[~2020-06-09  4:33 UTC|newest]

Thread overview: 101+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-09  4:29 incoming Andrew Morton
2020-06-09  4:29 ` [patch 01/93] kallsyms/printk: add loglvl to print_ip_sym() Andrew Morton
2020-06-09  4:30 ` [patch 02/93] alpha: add show_stack_loglvl() Andrew Morton
2020-06-09  4:30 ` [patch 03/93] arc: " Andrew Morton
2020-06-09  4:30 ` [patch 04/93] arm/asm: add loglvl to c_backtrace() Andrew Morton
2020-06-09  4:30 ` [patch 05/93] arm: add loglvl to unwind_backtrace() Andrew Morton
2020-06-09  4:30 ` [patch 06/93] arm: add loglvl to dump_backtrace() Andrew Morton
2020-06-09  4:30 ` [patch 07/93] arm: wire up dump_backtrace_{entry,stm} Andrew Morton
2020-06-09  4:30 ` [patch 08/93] arm: add show_stack_loglvl() Andrew Morton
2020-06-09  4:30 ` [patch 09/93] arm64: add loglvl to dump_backtrace() Andrew Morton
2020-06-09  4:30 ` [patch 10/93] arm64: add show_stack_loglvl() Andrew Morton
2020-06-09  4:30 ` [patch 11/93] c6x: " Andrew Morton
2020-06-09  4:30 ` [patch 12/93] csky: " Andrew Morton
2020-06-09  4:30 ` [patch 13/93] h8300: " Andrew Morton
2020-06-09  4:30 ` [patch 14/93] hexagon: " Andrew Morton
2020-06-09  4:30 ` [patch 15/93] ia64: pass log level as arg into ia64_do_show_stack() Andrew Morton
2020-06-09  4:30 ` [patch 16/93] ia64: add show_stack_loglvl() Andrew Morton
2020-06-09  4:30 ` [patch 17/93] m68k: " Andrew Morton
2020-06-09  4:30 ` [patch 18/93] microblaze: add loglvl to microblaze_unwind_inner() Andrew Morton
2020-06-09  4:30 ` [patch 19/93] microblaze: add loglvl to microblaze_unwind() Andrew Morton
2020-06-09  4:30 ` [patch 20/93] microblaze: add show_stack_loglvl() Andrew Morton
2020-06-09  4:30 ` [patch 21/93] mips: " Andrew Morton
2020-06-09  4:31 ` [patch 22/93] nds32: " Andrew Morton
2020-06-09  4:31 ` [patch 23/93] nios2: " Andrew Morton
2020-06-09  4:31 ` [patch 24/93] openrisc: " Andrew Morton
2020-06-09  4:31 ` [patch 25/93] parisc: " Andrew Morton
2020-06-09  4:31 ` [patch 26/93] powerpc: " Andrew Morton
2020-06-09  4:31 ` [patch 27/93] riscv: " Andrew Morton
2020-06-09  4:31 ` [patch 28/93] s390: " Andrew Morton
2020-06-09  4:31 ` [patch 29/93] sh: add loglvl to dump_mem() Andrew Morton
2020-06-09  4:31 ` [patch 30/93] sh: remove needless printk() Andrew Morton
2020-06-09  4:31 ` [patch 31/93] sh: add loglvl to printk_address() Andrew Morton
2020-06-09  4:31 ` [patch 32/93] sh: add loglvl to show_trace() Andrew Morton
2020-06-09  4:31 ` [patch 33/93] sh: add show_stack_loglvl() Andrew Morton
2020-06-09  4:31 ` [patch 34/93] sparc: " Andrew Morton
2020-06-09  4:31 ` [patch 35/93] um/sysrq: remove needless variable sp Andrew Morton
2020-06-09  4:31 ` [patch 36/93] um: add show_stack_loglvl() Andrew Morton
2020-06-09  4:31 ` [patch 37/93] unicore32: remove unused pmode argument in c_backtrace() Andrew Morton
2020-06-09  4:31 ` [patch 38/93] unicore32: add loglvl to c_backtrace() Andrew Morton
2020-06-09  4:31 ` [patch 39/93] unicore32: add show_stack_loglvl() Andrew Morton
2020-06-09  4:31 ` [patch 40/93] x86: add missing const qualifiers for log_lvl Andrew Morton
2020-06-09  4:32 ` [patch 41/93] x86: add show_stack_loglvl() Andrew Morton
2020-06-09  4:32 ` [patch 42/93] xtensa: add loglvl to show_trace() Andrew Morton
2020-06-09  4:32 ` [patch 43/93] xtensa: add show_stack_loglvl() Andrew Morton
2020-06-09  4:32 ` [patch 44/93] sysrq: use show_stack_loglvl() Andrew Morton
2020-06-09  4:32 ` [patch 45/93] x86/amd_gart: print stacktrace for a leak with KERN_ERR Andrew Morton
2020-06-09  4:32 ` [patch 46/93] power: use show_stack_loglvl() Andrew Morton
2020-06-09  4:32 ` [patch 47/93] kdb: don't play with console_loglevel Andrew Morton
2020-06-09  4:32 ` [patch 48/93] sched: print stack trace with KERN_INFO Andrew Morton
2020-06-09  4:32 ` [patch 49/93] kernel: use show_stack_loglvl() Andrew Morton
2020-06-09  4:32 ` [patch 50/93] kernel: rename show_stack_loglvl() => show_stack() Andrew Morton
2020-06-09  4:32 ` [patch 51/93] mm: don't include asm/pgtable.h if linux/mm.h is already included Andrew Morton
2020-06-09  4:32 ` [patch 52/93] mm: introduce include/linux/pgtable.h Andrew Morton
2020-06-09  4:32 ` [patch 53/93] mm: reorder includes after introduction of linux/pgtable.h Andrew Morton
2020-06-09  4:32 ` [patch 54/93] csky: replace definitions of __pXd_offset() with pXd_index() Andrew Morton
2020-06-09  4:32 ` [patch 55/93] m68k/mm/motorola: move comment about page table allocation funcitons Andrew Morton
2020-06-09  4:32 ` [patch 56/93] m68k/mm: move {cache,nocahe}_page() definitions close to their user Andrew Morton
2020-06-09  4:33 ` [patch 57/93] x86/mm: simplify init_trampoline() and surrounding logic Andrew Morton
2020-06-09  4:33 ` [patch 58/93] mm: pgtable: add shortcuts for accessing kernel PMD and PTE Andrew Morton
2020-06-09  4:33 ` [patch 59/93] mm: consolidate pte_index() and pte_offset_*() definitions Andrew Morton
2020-06-09  4:33 ` [patch 60/93] mmap locking API: initial implementation as rwsem wrappers Andrew Morton
2020-06-09  4:33 ` [patch 61/93] MMU notifier: use the new mmap locking API Andrew Morton
2020-06-09  4:33 ` [patch 62/93] DMA reservations: " Andrew Morton
2020-06-09  4:33 ` [patch 63/93] mmap locking API: use coccinelle to convert mmap_sem rwsem call sites Andrew Morton
2020-06-09  4:33 ` [patch 64/93] mmap locking API: convert mmap_sem call sites missed by coccinelle Andrew Morton
2020-06-09  4:33 ` [patch 65/93] mmap locking API: convert nested write lock sites Andrew Morton
2020-06-09  4:33 ` [patch 66/93] mmap locking API: add mmap_read_trylock_non_owner() Andrew Morton
2020-06-09  4:33 ` [patch 67/93] mmap locking API: add MMAP_LOCK_INITIALIZER Andrew Morton
2020-06-09  4:33 ` [patch 68/93] mmap locking API: add mmap_assert_locked() and mmap_assert_write_locked() Andrew Morton
2020-06-09  4:33 ` Andrew Morton [this message]
2020-06-09  4:33 ` [patch 70/93] mmap locking API: convert mmap_sem API comments Andrew Morton
2020-06-09  4:33 ` [patch 71/93] mmap locking API: convert mmap_sem comments Andrew Morton
2020-06-09  4:33 ` [patch 72/93] maccess: unexport probe_kernel_write() Andrew Morton
2020-06-09  4:34 ` [patch 73/93] maccess: remove various unused weak aliases Andrew Morton
2020-06-09  4:34 ` [patch 74/93] maccess: remove duplicate kerneldoc comments Andrew Morton
2020-06-09  4:34 ` [patch 75/93] maccess: clarify " Andrew Morton
2020-06-09  4:34 ` [patch 76/93] maccess: update the top of file comment Andrew Morton
2020-06-09  4:34 ` [patch 77/93] maccess: rename strncpy_from_unsafe_user to strncpy_from_user_nofault Andrew Morton
2020-06-09  4:34 ` [patch 78/93] maccess: rename strncpy_from_unsafe_strict to strncpy_from_kernel_nofault Andrew Morton
2020-06-09  4:34 ` [patch 79/93] maccess: rename strnlen_unsafe_user to strnlen_user_nofault Andrew Morton
2020-06-09  4:34 ` [patch 80/93] maccess: remove probe_read_common and probe_write_common Andrew Morton
2020-06-09  4:34 ` [patch 81/93] maccess: unify the probe kernel arch hooks Andrew Morton
2020-06-09  4:34 ` [patch 82/93] bpf: factor out a bpf_trace_copy_string helper Andrew Morton
2020-06-09  4:34 ` [patch 83/93] bpf: handle the compat string in bpf_trace_copy_string better Andrew Morton
2020-06-09  4:34 ` [patch 84/93] bpf:bpf_seq_printf(): handle potentially unsafe format string better Andrew Morton
2020-06-09  4:34 ` [patch 85/93] bpf: rework the compat kernel probe handling Andrew Morton
2020-06-09  4:34 ` [patch 86/93] tracing/kprobes: handle mixed kernel/userspace probes better Andrew Morton
2020-06-09  4:34 ` [patch 87/93] maccess: remove strncpy_from_unsafe Andrew Morton
2020-06-09  4:34 ` [patch 88/93] maccess: always use strict semantics for probe_kernel_read Andrew Morton
2020-06-09  4:34 ` [patch 89/93] maccess: move user access routines together Andrew Morton
2020-06-09  4:34 ` [patch 90/93] maccess: allow architectures to provide kernel probing directly Andrew Morton
2020-06-09  4:35 ` [patch 91/93] x86: use non-set_fs based maccess routines Andrew Morton
2020-06-09 18:01   ` Linus Torvalds
2020-06-09 18:06     ` Linus Torvalds
2020-06-10  6:57       ` Christoph Hellwig
2020-06-09  4:35 ` [patch 92/93] maccess: return -ERANGE when probe_kernel_read() fails Andrew Morton
2020-06-09  4:35 ` [patch 93/93] include/linux/cache.h: expand documentation over __read_mostly Andrew Morton
2020-06-17 15:51   ` Christopher Lameter
2020-06-09  5:34 ` mmotm 2020-06-08-22-33 uploaded Andrew Morton
2020-06-09  5:36 ` mmotm 2020-06-08-22-35 uploaded Andrew Morton
2020-06-09 16:58 ` incoming Linus Torvalds

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