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From:   Michel Lespinasse <michel@lespinasse.org>
To:     Linux-MM <linux-mm@kvack.org>,
        Linux-Kernel <linux-kernel@vger.kernel.org>
Cc:     Laurent Dufour <ldufour@linux.ibm.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Michal Hocko <mhocko@suse.com>,
        Matthew Wilcox <willy@infradead.org>,
        Rik van Riel <riel@surriel.com>,
        Paul McKenney <paulmck@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Suren Baghdasaryan <surenb@google.com>,
        Joel Fernandes <joelaf@google.com>,
        Andy Lutomirski <luto@kernel.org>,
        Michel Lespinasse <michel@lespinasse.org>
Subject: [PATCH 03/29] mmap locking API: name the return values
Date:   Fri, 30 Apr 2021 12:52:04 -0700
Message-Id: <20210430195232.30491-4-michel@lespinasse.org>
In-Reply-To: <20210430195232.30491-1-michel@lespinasse.org>
References: <20210430195232.30491-1-michel@lespinasse.org>
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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@lespinasse.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 4e27f755766b..8ff276a7560e 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