From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DF98BC04E87 for ; Tue, 21 May 2019 04:53:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BEFE421019 for ; Tue, 21 May 2019 04:53:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727803AbfEUExf (ORCPT ); Tue, 21 May 2019 00:53:35 -0400 Received: from smtp.nue.novell.com ([195.135.221.5]:59926 "EHLO smtp.nue.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725835AbfEUExe (ORCPT ); Tue, 21 May 2019 00:53:34 -0400 Received: from emea4-mta.ukb.novell.com ([10.120.13.87]) by smtp.nue.novell.com with ESMTP (TLS encrypted); Tue, 21 May 2019 06:53:33 +0200 Received: from linux-r8p5.suse.de (nwb-a10-snat.microfocus.com [10.120.13.201]) by emea4-mta.ukb.novell.com with ESMTP (TLS encrypted); Tue, 21 May 2019 05:53:01 +0100 From: Davidlohr Bueso To: linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: akpm@linux-foundation.org, willy@infradead.org, mhocko@kernel.org, mgorman@techsingularity.net, jglisse@redhat.com, ldufour@linux.vnet.ibm.com, dave@stgolabs.net, Davidlohr Bueso Subject: [PATCH 03/14] mm: introduce mm locking wrappers Date: Mon, 20 May 2019 21:52:31 -0700 Message-Id: <20190521045242.24378-4-dave@stgolabs.net> X-Mailer: git-send-email 2.16.4 In-Reply-To: <20190521045242.24378-1-dave@stgolabs.net> References: <20190521045242.24378-1-dave@stgolabs.net> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch adds the necessary wrappers to encapsulate mmap_sem locking and will enable any future changes to be a lot more confined to here. In addition, future users will incrementally be added in the next patches. mm_[read/write]_[un]lock() naming is used. Signed-off-by: Davidlohr Bueso --- include/linux/mm.h | 76 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 76 insertions(+) diff --git a/include/linux/mm.h b/include/linux/mm.h index 0e8834ac32b7..780b6097ee47 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -12,6 +12,7 @@ #include #include #include +#include #include #include #include @@ -2880,5 +2881,80 @@ void __init setup_nr_node_ids(void); static inline void setup_nr_node_ids(void) {} #endif +/* + * Address space locking wrappers. + */ +static inline bool mm_is_locked(struct mm_struct *mm, + struct range_lock *mmrange) +{ + return rwsem_is_locked(&mm->mmap_sem); +} + +/* Reader wrappers */ +static inline int mm_read_trylock(struct mm_struct *mm, + struct range_lock *mmrange) +{ + return down_read_trylock(&mm->mmap_sem); +} + +static inline void mm_read_lock(struct mm_struct *mm, + struct range_lock *mmrange) +{ + down_read(&mm->mmap_sem); +} + +static inline void mm_read_lock_nested(struct mm_struct *mm, + struct range_lock *mmrange, int subclass) +{ + down_read_nested(&mm->mmap_sem, subclass); +} + +static inline void mm_read_unlock(struct mm_struct *mm, + struct range_lock *mmrange) +{ + up_read(&mm->mmap_sem); +} + +/* Writer wrappers */ +static inline int mm_write_trylock(struct mm_struct *mm, + struct range_lock *mmrange) +{ + return down_write_trylock(&mm->mmap_sem); +} + +static inline void mm_write_lock(struct mm_struct *mm, + struct range_lock *mmrange) +{ + down_write(&mm->mmap_sem); +} + +static inline int mm_write_lock_killable(struct mm_struct *mm, + struct range_lock *mmrange) +{ + return down_write_killable(&mm->mmap_sem); +} + +static inline void mm_downgrade_write(struct mm_struct *mm, + struct range_lock *mmrange) +{ + downgrade_write(&mm->mmap_sem); +} + +static inline void mm_write_unlock(struct mm_struct *mm, + struct range_lock *mmrange) +{ + up_write(&mm->mmap_sem); +} + +static inline void mm_write_lock_nested(struct mm_struct *mm, + struct range_lock *mmrange, + int subclass) +{ + down_write_nested(&mm->mmap_sem, subclass); +} + +#define mm_write_nest_lock(mm, range, nest_lock) \ + down_write_nest_lock(&(mm)->mmap_sem, nest_lock) + #endif /* __KERNEL__ */ #endif /* _LINUX_MM_H */ -- 2.16.4