linux-kernel - [PATCH v2 03/35] mmap locking API: name the return values

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Date:   Fri, 28 Jan 2022 05:09:34 -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 03/35] mmap locking API: name the return values

In the mmap locking API, the *_killable() functions return an error
(or 0 on success), and the *_trylock() functions return a boolean
(true on success).

Rename the return values "int error" and "bool ok", respectively,
rather than using "ret" for both cases which I find less readable.

Signed-off-by: Michel Lespinasse <michel@...pinasse.org>
---
 include/linux/mmap_lock.h | 32 ++++++++++++++++----------------
 1 file changed, 16 insertions(+), 16 deletions(-)

diff --git a/include/linux/mmap_lock.h b/include/linux/mmap_lock.h
index db9785e11274..1b14468183d7 100644
--- a/include/linux/mmap_lock.h
+++ b/include/linux/mmap_lock.h
@@ -81,22 +81,22 @@ static inline void mmap_write_lock_nested(struct mm_struct *mm, int subclass)
 
 static inline int mmap_write_lock_killable(struct mm_struct *mm)
 {
-	int ret;
+	int error;
 
 	__mmap_lock_trace_start_locking(mm, true);
-	ret = down_write_killable(&mm->mmap_lock);
-	__mmap_lock_trace_acquire_returned(mm, true, ret == 0);
-	return ret;
+	error = down_write_killable(&mm->mmap_lock);
+	__mmap_lock_trace_acquire_returned(mm, true, !error);
+	return error;
 }
 
 static inline bool mmap_write_trylock(struct mm_struct *mm)
 {
-	bool ret;
+	bool ok;
 
 	__mmap_lock_trace_start_locking(mm, true);
-	ret = down_write_trylock(&mm->mmap_lock) != 0;
-	__mmap_lock_trace_acquire_returned(mm, true, ret);
-	return ret;
+	ok = down_write_trylock(&mm->mmap_lock) != 0;
+	__mmap_lock_trace_acquire_returned(mm, true, ok);
+	return ok;
 }
 
 static inline void mmap_write_unlock(struct mm_struct *mm)
@@ -120,22 +120,22 @@ static inline void mmap_read_lock(struct mm_struct *mm)
 
 static inline int mmap_read_lock_killable(struct mm_struct *mm)
 {
-	int ret;
+	int error;
 
 	__mmap_lock_trace_start_locking(mm, false);
-	ret = down_read_killable(&mm->mmap_lock);
-	__mmap_lock_trace_acquire_returned(mm, false, ret == 0);
-	return ret;
+	error = down_read_killable(&mm->mmap_lock);
+	__mmap_lock_trace_acquire_returned(mm, false, !error);
+	return error;
 }
 
 static inline bool mmap_read_trylock(struct mm_struct *mm)
 {
-	bool ret;
+	bool ok;
 
 	__mmap_lock_trace_start_locking(mm, false);
-	ret = down_read_trylock(&mm->mmap_lock) != 0;
-	__mmap_lock_trace_acquire_returned(mm, false, ret);
-	return ret;
+	ok = down_read_trylock(&mm->mmap_lock) != 0;
+	__mmap_lock_trace_acquire_returned(mm, false, ok);
+	return ok;
 }
 
 static inline void mmap_read_unlock(struct mm_struct *mm)
-- 
2.20.1