linux-kernel - [PATCH v2 4/4] net: fix opencoded for_each_and_bit() in __netif_set_xps

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Date:   Thu, 13 Oct 2022 16:43:48 -0700
From:   Yury Norov <yury.norov@...il.com>
To:     netdev@...r.kernel.org, "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Menglong Dong <imagedong@...cent.com>,
        Kuniyuki Iwashima <kuniyu@...zon.com>,
        Petr Machata <petrm@...dia.com>,
        Guo Ren <guoren@...ux.alibaba.com>,
        "Michael S . Tsirkin" <mst@...hat.com>
Cc:     Yury Norov <yury.norov@...il.com>, linux-kernel@...r.kernel.org
Subject: [PATCH v2 4/4] net: fix opencoded for_each_and_bit() in __netif_set_xps_queue()

Replace opencoded bitmap traversing and drop unused
netif_attrmask_next*() functions

Signed-off-by: Yury Norov <yury.norov@...il.com>
---
 include/linux/netdevice.h | 46 ---------------------------------------
 net/core/dev.c            |  3 +--
 2 files changed, 1 insertion(+), 48 deletions(-)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 53d738f66159..5db2b6de7308 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -3648,52 +3648,6 @@ static inline bool netif_attr_test_online(unsigned long j,
 
 	return (j < nr_bits);
 }
-
-/**
- *	netif_attrmask_next - get the next CPU/Rx queue in a cpu/Rx queues mask
- *	@n: CPU/Rx queue index
- *	@srcp: the cpumask/Rx queue mask pointer
- *	@nr_bits: number of bits in the bitmask
- *
- * Returns >= nr_bits if no further CPUs/Rx queues set.
- */
-static inline unsigned int netif_attrmask_next(int n, const unsigned long *srcp,
-					       unsigned int nr_bits)
-{
-	/* n is a prior cpu */
-	cpu_max_bits_warn(n + 1, nr_bits);
-
-	if (srcp)
-		return find_next_bit(srcp, nr_bits, n + 1);
-
-	return n + 1;
-}
-
-/**
- *	netif_attrmask_next_and - get the next CPU/Rx queue in \*src1p & \*src2p
- *	@n: CPU/Rx queue index
- *	@src1p: the first CPUs/Rx queues mask pointer
- *	@src2p: the second CPUs/Rx queues mask pointer
- *	@nr_bits: number of bits in the bitmask
- *
- * Returns >= nr_bits if no further CPUs/Rx queues set in both.
- */
-static inline int netif_attrmask_next_and(int n, const unsigned long *src1p,
-					  const unsigned long *src2p,
-					  unsigned int nr_bits)
-{
-	/* n is a prior cpu */
-	cpu_max_bits_warn(n + 1, nr_bits);
-
-	if (src1p && src2p)
-		return find_next_and_bit(src1p, src2p, nr_bits, n + 1);
-	else if (src1p)
-		return find_next_bit(src1p, nr_bits, n + 1);
-	else if (src2p)
-		return find_next_bit(src2p, nr_bits, n + 1);
-
-	return n + 1;
-}
 #else
 static inline int netif_set_xps_queue(struct net_device *dev,
 				      const struct cpumask *mask,
diff --git a/net/core/dev.c b/net/core/dev.c
index 8049e2ff11a5..b0fb592d51da 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2592,8 +2592,7 @@ int __netif_set_xps_queue(struct net_device *dev, const unsigned long *mask,
 		copy = true;
 
 	/* allocate memory for queue storage */
-	for (j = -1; j = netif_attrmask_next_and(j, online_mask, mask, nr_ids),
-	     j < nr_ids;) {
+	for_each_and_bit(j, online_mask, mask ? : online_mask, nr_ids) {
 		if (!new_dev_maps) {
 			new_dev_maps = kzalloc(maps_sz, GFP_KERNEL);
 			if (!new_dev_maps)
-- 
2.34.1