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=-11.6 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,UNWANTED_LANGUAGE_BODY,USER_AGENT_GIT, USER_IN_DEF_DKIM_WL autolearn=ham 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 51F6EC38BE6 for ; Mon, 24 Feb 2020 20:31:05 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 16F6220675 for ; Mon, 24 Feb 2020 20:31:05 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="Kpt+Eby1" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 16F6220675 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id B8EAE6B0010; Mon, 24 Feb 2020 15:31:04 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id A765E6B0032; Mon, 24 Feb 2020 15:31:04 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 98C4B6B0037; Mon, 24 Feb 2020 15:31:04 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0044.hostedemail.com [216.40.44.44]) by kanga.kvack.org (Postfix) with ESMTP id 724A56B0010 for ; Mon, 24 Feb 2020 15:31:04 -0500 (EST) Received: from smtpin16.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 21CCF283A for ; Mon, 24 Feb 2020 20:31:04 +0000 (UTC) X-FDA: 76526164848.16.boys17_26581bb57184e X-HE-Tag: boys17_26581bb57184e X-Filterd-Recvd-Size: 5213 Received: from mail-pg1-f202.google.com (mail-pg1-f202.google.com [209.85.215.202]) by imf05.hostedemail.com (Postfix) with ESMTP for ; Mon, 24 Feb 2020 20:31:03 +0000 (UTC) Received: by mail-pg1-f202.google.com with SMTP id 22so3420423pgw.17 for ; Mon, 24 Feb 2020 12:31:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=6WvjRiSpown38CK25rwzKHDBkhPoLyfSbpmVDS9ELyM=; b=Kpt+Eby1mRPxXLxVO2mVgj1xfhsuqOtEa80HGpVoYQgDfjpEbCS71R9wuRbdEFXcEN BBB8zz72QzoMiYJW2YD7uh+P5zZBIRG89G8WzweFWmXUElAKP9yHJe4SQsYJ7KdKSrMw t7wCuGQbTbaH1dhrqj7kyZ2TiA8YCi7yrTZlKRoOpX46CcKpLQQ6hNOmyBGUMWcgixZl CMAwgfybLy9/QMRTZUSkt8bQBZMIAIcNnLbpRf7mqxkbSxB1XYFEK6debDW9Gi11hgCj zvBqssNhI/I14YwwRhqvQ1mr4A7nVWV8u+iacLTOXcWQcqVqhexTVguezqOCVRzMvXXa d6NA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=6WvjRiSpown38CK25rwzKHDBkhPoLyfSbpmVDS9ELyM=; b=IbKnKJTqrYWkhYHAeKeAn8lr/LCKH1ArNLqYWVZVsLyv7I+FJBjIB/iAcPH41bSe4m MTUZmQCTXjQsh6RC5iYGS7F7OzndoWcJCEOlS2mW+ZexlXFEtZvus4d2CQQ7QBi9C0+7 VdmVqiT6RQ9xmvVWtUaWSgFDGWO/fc9ZGP5yICCRg2IFKIR0Fe5kBkfE8v5MqYYolJwr fln0ntCbM3DGxkqycfTS5ChGKab0V1TO9qOyl6FPx6XtXlZB4JFEivSpAL7FcqB5StRZ AG5dpQwf6OpIrGaoa4VZ4FHi0yiOm3AFdHq+VVJjM8qUd7JaoVlz9KLd2SKmfa3Ygq/5 JPtQ== X-Gm-Message-State: APjAAAVZKL46OGJ/70SWtnqurEOSaEuYg+FSlY4SRtPYASDzbYwl7spz QqCYMKSx8S8slNGZvcALkWQJu3zgXCc= X-Google-Smtp-Source: APXvYqy1kQ/242Ir7ArBeTTk0abFUYNw7P+UA6Wd82K50T52J/W5OyTQYoq/T0PbN3zbDq0gOqHYD947cHY= X-Received: by 2002:a63:4e22:: with SMTP id c34mr18679078pgb.263.1582576262234; Mon, 24 Feb 2020 12:31:02 -0800 (PST) Date: Mon, 24 Feb 2020 12:30:34 -0800 In-Reply-To: <20200224203057.162467-1-walken@google.com> Message-Id: <20200224203057.162467-2-walken@google.com> Mime-Version: 1.0 References: <20200224203057.162467-1-walken@google.com> X-Mailer: git-send-email 2.25.0.265.gbab2e86ba0-goog Subject: [RFC PATCH 01/24] MM locking API: initial implementation as rwsem wrappers From: Michel Lespinasse To: Peter Zijlstra , Andrew Morton , Laurent Dufour , Vlastimil Babka , Matthew Wilcox , "Liam R . Howlett" , Jerome Glisse , Davidlohr Bueso , David Rientjes Cc: linux-mm , Michel Lespinasse Content-Type: text/plain; charset="UTF-8" X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: This change wraps the existing mmap_sem related rwsem calls into a new MM locking API. This is in preparation to extending that API to support locking fine grained memory ranges. Signed-off-by: Michel Lespinasse --- include/linux/mm.h | 1 + include/linux/mm_lock.h | 59 +++++++++++++++++++++++++++++++++++++++++ 2 files changed, 60 insertions(+) create mode 100644 include/linux/mm_lock.h diff --git include/linux/mm.h include/linux/mm.h index cfaa8feecfe8..052f423d7f67 100644 --- include/linux/mm.h +++ include/linux/mm.h @@ -15,6 +15,7 @@ #include #include #include +#include #include #include #include diff --git include/linux/mm_lock.h include/linux/mm_lock.h new file mode 100644 index 000000000000..b5f134285e53 --- /dev/null +++ include/linux/mm_lock.h @@ -0,0 +1,59 @@ +#ifndef _LINUX_MM_LOCK_H +#define _LINUX_MM_LOCK_H + +static inline void mm_init_lock(struct mm_struct *mm) +{ + init_rwsem(&mm->mmap_sem); +} + +static inline void mm_write_lock(struct mm_struct *mm) +{ + down_write(&mm->mmap_sem); +} + +static inline int mm_write_lock_killable(struct mm_struct *mm) +{ + return down_write_killable(&mm->mmap_sem); +} + +static inline bool mm_write_trylock(struct mm_struct *mm) +{ + return down_write_trylock(&mm->mmap_sem) != 0; +} + +static inline void mm_write_unlock(struct mm_struct *mm) +{ + up_write(&mm->mmap_sem); +} + +static inline void mm_downgrade_write_lock(struct mm_struct *mm) +{ + downgrade_write(&mm->mmap_sem); +} + +static inline void mm_read_lock(struct mm_struct *mm) +{ + down_read(&mm->mmap_sem); +} + +static inline int mm_read_lock_killable(struct mm_struct *mm) +{ + return down_read_killable(&mm->mmap_sem); +} + +static inline bool mm_read_trylock(struct mm_struct *mm) +{ + return down_read_trylock(&mm->mmap_sem) != 0; +} + +static inline void mm_read_unlock(struct mm_struct *mm) +{ + up_read(&mm->mmap_sem); +} + +static inline bool mm_is_locked(struct mm_struct *mm) +{ + return rwsem_is_locked(&mm->mmap_sem) != 0; +} + +#endif /* _LINUX_MM_LOCK_H */ -- 2.25.0.341.g760bfbb309-goog