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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 08/12] mmap locking API: add MMAP_LOCK_INITIALIZER
Date: Tue, 19 May 2020 22:29:04 -0700	[thread overview]
Message-ID: <20200520052908.204642-9-walken@google.com> (raw)
In-Reply-To: <20200520052908.204642-1-walken@google.com>

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@google.com>
Reviewed-by: Laurent Dufour <ldufour@linux.ibm.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
---
 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(-)

diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c
index b89f6ac6a0c0..885058325c20 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_LOCK_INITIALIZER(init_mm)
 	.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 911a2bd0f6b7..916313ec8acb 100644
--- a/drivers/firmware/efi/efi.c
+++ b/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},
diff --git a/include/linux/mmap_lock.h b/include/linux/mmap_lock.h
index d1826ce42f00..acac1bf5ecd2 100644
--- a/include/linux/mmap_lock.h
+++ b/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);
diff --git a/mm/init-mm.c b/mm/init-mm.c
index 19603302a77f..fe9c03d8e07b 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_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),
-- 
2.26.2.761.g0e0b3e54be-goog



  parent reply	other threads:[~2020-05-20  5:29 UTC|newest]

Thread overview: 32+ 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 ` Michel Lespinasse [this message]
2020-05-29 20:17   ` [PATCH v6 08/12] mmap locking API: add MMAP_LOCK_INITIALIZER 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 ` [PATCH v6 10/12] mmap locking API: rename mmap_sem to mmap_lock Michel Lespinasse
2020-05-22 14:16   ` 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

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