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Message-Id: <20200327225102.25061-9-walken@google.com>
Date: Fri, 27 Mar 2020 15:51:00 -0700
From: Michel Lespinasse <walken@...gle.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
linux-mm <linux-mm@...ck.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
Peter Zijlstra <peterz@...radead.org>,
Laurent Dufour <ldufour@...ux.ibm.com>,
Vlastimil Babka <vbabka@...e.cz>,
Matthew Wilcox <willy@...radead.org>,
Liam Howlett <Liam.Howlett@...cle.com>,
Jerome Glisse <jglisse@...hat.com>,
Davidlohr Bueso <dave@...olabs.net>,
David Rientjes <rientjes@...gle.com>,
Hugh Dickins <hughd@...gle.com>, Ying Han <yinghan@...gle.com>,
Jason Gunthorpe <jgg@...pe.ca>,
Markus Elfring <Markus.Elfring@....de>,
Michel Lespinasse <walken@...gle.com>
Subject: [PATCH v3 08/10] 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.
Signed-off-by: Michel Lespinasse <walken@...gle.com>
---
arch/x86/kernel/tboot.c | 2 +-
drivers/firmware/efi/efi.c | 2 +-
include/linux/mmap_lock.h | 2 ++
mm/init-mm.c | 2 +-
4 files changed, 5 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c
index b89f6ac6a0c0..4b79335624b1 100644
--- a/arch/x86/kernel/tboot.c
+++ b/arch/x86/kernel/tboot.c
@@ -90,7 +90,7 @@ 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_sem = MMAP_LOCK_INITIALIZER(init_mm.mmap_sem),
.page_table_lock = __SPIN_LOCK_UNLOCKED(init_mm.page_table_lock),
.mmlist = LIST_HEAD_INIT(init_mm.mmlist),
};
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index 21ea99f65113..5bdfe698cd7f 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -60,7 +60,7 @@ 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_sem = MMAP_LOCK_INITIALIZER(efi_mm.mmap_sem),
.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},
diff --git a/include/linux/mmap_lock.h b/include/linux/mmap_lock.h
index a80cf9695514..25a8a5458b84 100644
--- a/include/linux/mmap_lock.h
+++ b/include/linux/mmap_lock.h
@@ -1,6 +1,8 @@
#ifndef _LINUX_MMAP_LOCK_H
#define _LINUX_MMAP_LOCK_H
+#define MMAP_LOCK_INITIALIZER(name) __RWSEM_INITIALIZER(name)
+
static inline void mmap_init_lock(struct mm_struct *mm)
{
init_rwsem(&mm->mmap_sem);
diff --git a/mm/init-mm.c b/mm/init-mm.c
index 19603302a77f..3c128bd6a30c 100644
--- a/mm/init-mm.c
+++ b/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_sem = MMAP_LOCK_INITIALIZER(init_mm.mmap_sem),
.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),
--
2.26.0.rc2.310.g2932bb562d-goog
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