linux-kernel - [PATCH v2 02/35] mmap locking API: mmap_lock_is

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Message-Id: <20220128131006.67712-3-michel@lespinasse.org>
Date:   Fri, 28 Jan 2022 05:09:33 -0800
From:   Michel Lespinasse <michel@...pinasse.org>
To:     Linux-MM <linux-mm@...ck.org>, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     kernel-team@...com, Laurent Dufour <ldufour@...ux.ibm.com>,
        Jerome Glisse <jglisse@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Michal Hocko <mhocko@...e.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Davidlohr Bueso <dave@...olabs.net>,
        Matthew Wilcox <willy@...radead.org>,
        Liam Howlett <liam.howlett@...cle.com>,
        Rik van Riel <riel@...riel.com>,
        Paul McKenney <paulmck@...nel.org>,
        Song Liu <songliubraving@...com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Minchan Kim <minchan@...gle.com>,
        Joel Fernandes <joelaf@...gle.com>,
        David Rientjes <rientjes@...gle.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Michel Lespinasse <michel@...pinasse.org>
Subject: [PATCH v2 02/35] mmap locking API: mmap_lock_is_contended returns a bool

Change mmap_lock_is_contended to return a bool value, rather than an
int which the callers are then supposed to interpret as a bool. This
is to ensure consistency with other mmap lock API functions (such as
the trylock functions).

Signed-off-by: Michel Lespinasse <michel@...pinasse.org>
---
 include/linux/mmap_lock.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/mmap_lock.h b/include/linux/mmap_lock.h
index 96e113e23d04..db9785e11274 100644
--- a/include/linux/mmap_lock.h
+++ b/include/linux/mmap_lock.h
@@ -162,9 +162,9 @@ static inline void mmap_assert_write_locked(struct mm_struct *mm)
 	VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_lock), mm);
 }
 
-static inline int mmap_lock_is_contended(struct mm_struct *mm)
+static inline bool mmap_lock_is_contended(struct mm_struct *mm)
 {
-	return rwsem_is_contended(&mm->mmap_lock);
+	return rwsem_is_contended(&mm->mmap_lock) != 0;
 }
 
 #endif /* _LINUX_MMAP_LOCK_H */
-- 
2.20.1