The patch titled
Subject: mmap locking API: add MMAP_LOCK_INITIALIZER
has been added to the -mm tree. Its filename is
mmap-locking-api-add-mmap_lock_initializer.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mmap-locking-api-add-mmap_lock_initializer.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mmap-locking-api-add-mmap_lock_initializer.patch
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------------------------------------------------------
From: Michel Lespinasse <walken@xxxxxxxxxx>
Subject: mmap locking API: add MMAP_LOCK_INITIALIZER
Define a new initializer for the mmap locking api. Initially this just
evaluates to __RWSEM_INITIALIZER as the API is defined as wrappers around
rwsem.
Link: http://lkml.kernel.org/r/20200520052908.204642-9-walken@xxxxxxxxxx
Signed-off-by: Michel Lespinasse <walken@xxxxxxxxxx>
Reviewed-by: Laurent Dufour <ldufour@xxxxxxxxxxxxx>
Reviewed-by: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Daniel Jordan <daniel.m.jordan@xxxxxxxxxx>
Cc: Davidlohr Bueso <dbueso@xxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Jason Gunthorpe <jgg@xxxxxxxx>
Cc: Jerome Glisse <jglisse@xxxxxxxxxx>
Cc: John Hubbard <jhubbard@xxxxxxxxxx>
Cc: Liam Howlett <Liam.Howlett@xxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Ying Han <yinghan@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/kernel/tboot.c | 2 +-
drivers/firmware/efi/efi.c | 2 +-
include/linux/mmap_lock.h | 3 +++
mm/init-mm.c | 2 +-
4 files changed, 6 insertions(+), 3 deletions(-)
--- a/arch/x86/kernel/tboot.c~mmap-locking-api-add-mmap_lock_initializer
+++ a/arch/x86/kernel/tboot.c
@@ -93,7 +93,7 @@ static struct mm_struct tboot_mm = {
.pgd = swapper_pg_dir,
.mm_users = ATOMIC_INIT(2),
.mm_count = ATOMIC_INIT(1),
- .mmap_sem = __RWSEM_INITIALIZER(init_mm.mmap_sem),
+ MMAP_LOCK_INITIALIZER(init_mm)
.page_table_lock = __SPIN_LOCK_UNLOCKED(init_mm.page_table_lock),
.mmlist = LIST_HEAD_INIT(init_mm.mmlist),
};
--- a/drivers/firmware/efi/efi.c~mmap-locking-api-add-mmap_lock_initializer
+++ a/drivers/firmware/efi/efi.c
@@ -54,7 +54,7 @@ struct mm_struct efi_mm = {
.mm_rb = RB_ROOT,
.mm_users = ATOMIC_INIT(2),
.mm_count = ATOMIC_INIT(1),
- .mmap_sem = __RWSEM_INITIALIZER(efi_mm.mmap_sem),
+ MMAP_LOCK_INITIALIZER(efi_mm)
.page_table_lock = __SPIN_LOCK_UNLOCKED(efi_mm.page_table_lock),
.mmlist = LIST_HEAD_INIT(efi_mm.mmlist),
.cpu_bitmap = { [BITS_TO_LONGS(NR_CPUS)] = 0},
--- a/include/linux/mmap_lock.h~mmap-locking-api-add-mmap_lock_initializer
+++ a/include/linux/mmap_lock.h
@@ -1,6 +1,9 @@
#ifndef _LINUX_MMAP_LOCK_H
#define _LINUX_MMAP_LOCK_H
+#define MMAP_LOCK_INITIALIZER(name) \
+ .mmap_sem = __RWSEM_INITIALIZER((name).mmap_sem),
+
static inline void mmap_init_lock(struct mm_struct *mm)
{
init_rwsem(&mm->mmap_sem);
--- a/mm/init-mm.c~mmap-locking-api-add-mmap_lock_initializer
+++ a/mm/init-mm.c
@@ -31,7 +31,7 @@ struct mm_struct init_mm = {
.pgd = swapper_pg_dir,
.mm_users = ATOMIC_INIT(2),
.mm_count = ATOMIC_INIT(1),
- .mmap_sem = __RWSEM_INITIALIZER(init_mm.mmap_sem),
+ MMAP_LOCK_INITIALIZER(init_mm)
.page_table_lock = __SPIN_LOCK_UNLOCKED(init_mm.page_table_lock),
.arg_lock = __SPIN_LOCK_UNLOCKED(init_mm.arg_lock),
.mmlist = LIST_HEAD_INIT(init_mm.mmlist),
_
Patches currently in -mm which might be from walken@xxxxxxxxxx are
mmap-locking-api-initial-implementation-as-rwsem-wrappers.patch
mmu-notifier-use-the-new-mmap-locking-api.patch
dma-reservations-use-the-new-mmap-locking-api.patch
mmap-locking-api-use-coccinelle-to-convert-mmap_sem-rwsem-call-sites.patch
mmap-locking-api-convert-mmap_sem-call-sites-missed-by-coccinelle.patch
mmap-locking-api-convert-nested-write-lock-sites.patch
mmap-locking-api-add-mmap_read_trylock_non_owner.patch
mmap-locking-api-add-mmap_lock_initializer.patch
mmap-locking-api-add-mmap_assert_locked-and-mmap_assert_write_locked.patch
mmap-locking-api-rename-mmap_sem-to-mmap_lock.patch
mmap-locking-api-convert-mmap_sem-api-comments.patch
mmap-locking-api-convert-mmap_sem-comments.patch
