linux-kernel - [PATCH v2 2/7] drbd: Rip out the ERR_IF_CNT_IS

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Date:   Thu,  2 Mar 2023 13:54:40 +0100
From:   Christoph Böhmwalder 
        <christoph.boehmwalder@...bit.com>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     drbd-dev@...ts.linbit.com, linux-kernel@...r.kernel.org,
        Lars Ellenberg <lars.ellenberg@...bit.com>,
        Philipp Reisner <philipp.reisner@...bit.com>,
        linux-block@...r.kernel.org,
        Andreas Gruenbacher <agruen@...bit.com>,
        Christoph Böhmwalder 
        <christoph.boehmwalder@...bit.com>
Subject: [PATCH v2 2/7] drbd: Rip out the ERR_IF_CNT_IS_NEGATIVE macro

From: Andreas Gruenbacher <agruen@...bit.com>

Signed-off-by: Andreas Gruenbacher <agruen@...bit.com>
Signed-off-by: Christoph Böhmwalder <christoph.boehmwalder@...bit.com>
---
 drivers/block/drbd/drbd_int.h | 37 ++++++++++++++---------------------
 1 file changed, 15 insertions(+), 22 deletions(-)

diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index d89b7d03d4c8..772023ace749 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -1918,18 +1918,14 @@ static inline void inc_ap_pending(struct drbd_device *device)
 	atomic_inc(&device->ap_pending_cnt);
 }
 
-#define ERR_IF_CNT_IS_NEGATIVE(which, func, line)			\
-	if (atomic_read(&device->which) < 0)				\
-		drbd_err(device, "in %s:%d: " #which " = %d < 0 !\n",	\
-			func, line,					\
-			atomic_read(&device->which))
-
-#define dec_ap_pending(device) _dec_ap_pending(device, __func__, __LINE__)
-static inline void _dec_ap_pending(struct drbd_device *device, const char *func, int line)
+#define dec_ap_pending(device) ((void)expect((device), __dec_ap_pending(device) >= 0))
+static inline int __dec_ap_pending(struct drbd_device *device)
 {
-	if (atomic_dec_and_test(&device->ap_pending_cnt))
+	int ap_pending_cnt = atomic_dec_return(&device->ap_pending_cnt);
+
+	if (ap_pending_cnt == 0)
 		wake_up(&device->misc_wait);
-	ERR_IF_CNT_IS_NEGATIVE(ap_pending_cnt, func, line);
+	return ap_pending_cnt;
 }
 
 /* counts how many resync-related answers we still expect from the peer
@@ -1943,11 +1939,10 @@ static inline void inc_rs_pending(struct drbd_device *device)
 	atomic_inc(&device->rs_pending_cnt);
 }
 
-#define dec_rs_pending(device) _dec_rs_pending(device, __func__, __LINE__)
-static inline void _dec_rs_pending(struct drbd_device *device, const char *func, int line)
+#define dec_rs_pending(device) ((void)expect((device), __dec_rs_pending(device) >= 0))
+static inline int __dec_rs_pending(struct drbd_device *device)
 {
-	atomic_dec(&device->rs_pending_cnt);
-	ERR_IF_CNT_IS_NEGATIVE(rs_pending_cnt, func, line);
+	return atomic_dec_return(&device->rs_pending_cnt);
 }
 
 /* counts how many answers we still need to send to the peer.
@@ -1964,18 +1959,16 @@ static inline void inc_unacked(struct drbd_device *device)
 	atomic_inc(&device->unacked_cnt);
 }
 
-#define dec_unacked(device) _dec_unacked(device, __func__, __LINE__)
-static inline void _dec_unacked(struct drbd_device *device, const char *func, int line)
+#define dec_unacked(device) ((void)expect(device, __dec_unacked(device) >= 0))
+static inline int __dec_unacked(struct drbd_device *device)
 {
-	atomic_dec(&device->unacked_cnt);
-	ERR_IF_CNT_IS_NEGATIVE(unacked_cnt, func, line);
+	return atomic_dec_return(&device->unacked_cnt);
 }
 
-#define sub_unacked(device, n) _sub_unacked(device, n, __func__, __LINE__)
-static inline void _sub_unacked(struct drbd_device *device, int n, const char *func, int line)
+#define sub_unacked(device, n) ((void)expect(device, __sub_unacked(device) >= 0))
+static inline int __sub_unacked(struct drbd_device *device, int n)
 {
-	atomic_sub(n, &device->unacked_cnt);
-	ERR_IF_CNT_IS_NEGATIVE(unacked_cnt, func, line);
+	return atomic_sub_return(n, &device->unacked_cnt);
 }
 
 static inline bool is_sync_target_state(enum drbd_conns connection_state)
-- 
2.39.1