linux-kernel - [PATCH locking/atomic 08/19] locking/atomic: Add kernel-doc header for arch_${atomic}_dec_if

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Date:   Wed, 10 May 2023 11:17:06 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     x86@...nel.org, akiyks@...il.com, linux-doc@...r.kernel.org,
        kernel-team@...a.com, "Paul E. McKenney" <paulmck@...nel.org>,
        Will Deacon <will@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Boqun Feng <boqun.feng@...il.com>,
        Mark Rutland <mark.rutland@....com>
Subject: [PATCH locking/atomic 08/19] locking/atomic: Add kernel-doc header for arch_${atomic}_dec_if_positive

Add kernel-doc header template for arch_${atomic}_dec_if_positive
function family.

Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
Cc: Will Deacon <will@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Boqun Feng <boqun.feng@...il.com>
Cc: Mark Rutland <mark.rutland@....com>
---
 include/linux/atomic/atomic-arch-fallback.h | 22 ++++++++++++++++++++-
 scripts/atomic/fallbacks/dec_if_positive    | 10 ++++++++++
 2 files changed, 31 insertions(+), 1 deletion(-)

diff --git a/include/linux/atomic/atomic-arch-fallback.h b/include/linux/atomic/atomic-arch-fallback.h
index ed72d94346e9..4d4d94925cb0 100644
--- a/include/linux/atomic/atomic-arch-fallback.h
+++ b/include/linux/atomic/atomic-arch-fallback.h
@@ -1641,6 +1641,16 @@ arch_atomic_dec_unless_positive(atomic_t *v)
 #endif
 
 #ifndef arch_atomic_dec_if_positive
+/**
+ * arch_atomic_dec_if_positive - Atomic decrement if old value is positive
+ * @v: pointer of type atomic_t
+ *
+ * Atomically decrement @v, but only if the original value is greater than zero,
+ * returning new value.  Note that the desired new value will be returned
+ * even if the decrement did not occur, so that if the old value is -3, then
+ * there @v will not be decremented, but -4 will be returned.  As a result,
+ * if the return value is non-negative, then the value was in fact decremented.
+ */
 static __always_inline int
 arch_atomic_dec_if_positive(atomic_t *v)
 {
@@ -3063,6 +3073,16 @@ arch_atomic64_dec_unless_positive(atomic64_t *v)
 #endif
 
 #ifndef arch_atomic64_dec_if_positive
+/**
+ * arch_atomic64_dec_if_positive - Atomic decrement if old value is positive
+ * @v: pointer of type atomic64_t
+ *
+ * Atomically decrement @v, but only if the original value is greater than zero,
+ * returning new value.  Note that the desired new value will be returned
+ * even if the decrement did not occur, so that if the old value is -3, then
+ * there @v will not be decremented, but -4 will be returned.  As a result,
+ * if the return value is non-negative, then the value was in fact decremented.
+ */
 static __always_inline s64
 arch_atomic64_dec_if_positive(atomic64_t *v)
 {
@@ -3080,4 +3100,4 @@ arch_atomic64_dec_if_positive(atomic64_t *v)
 #endif
 
 #endif /* _LINUX_ATOMIC_FALLBACK_H */
-// 3b29d5595f48f921507f19bc794c91aecb782ad3
+// c7041896e7e66a52d8005ba021f3b3b05f99bcb3
diff --git a/scripts/atomic/fallbacks/dec_if_positive b/scripts/atomic/fallbacks/dec_if_positive
index 86bdced3428d..dedbdbc1487d 100755
--- a/scripts/atomic/fallbacks/dec_if_positive
+++ b/scripts/atomic/fallbacks/dec_if_positive
@@ -1,4 +1,14 @@
 cat <<EOF
+/**
+ * arch_${atomic}_dec_if_positive - Atomic decrement if old value is positive
+ * @v: pointer of type ${atomic}_t
+ *
+ * Atomically decrement @v, but only if the original value is greater than zero,
+ * returning new value.  Note that the desired new value will be returned
+ * even if the decrement did not occur, so that if the old value is -3, then
+ * there @v will not be decremented, but -4 will be returned.  As a result,
+ * if the return value is non-negative, then the value was in fact decremented.
+ */
 static __always_inline ${ret}
 arch_${atomic}_dec_if_positive(${atomic}_t *v)
 {
-- 
2.40.1