net: use %*pb[l] to print bitmaps including cpumasks and nodemasks

printk and friends can now format bitmaps using '%*pb[l]'.  cpumask
and nodemask also provide cpumask_pr_args() and nodemask_pr_args()
respectively which can be used to generate the two printf arguments
necessary to format the specified cpu/nodemask.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 8 insertions, 22 deletions

diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index 999341244434..f2aa73bfb0e4 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -614,8 +614,7 @@ static ssize_t show_rps_map(struct netdev_rx_queue *queue,
 {
         struct rps_map *map;
         cpumask_var_t mask;
-        size_t len = 0;
-        int i;
+        int i, len;
 
         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
                 return -ENOMEM;
@@ -626,17 +625,11 @@ static ssize_t show_rps_map(struct netdev_rx_queue *queue,
                 for (i = 0; i < map->len; i++)
                         cpumask_set_cpu(map->cpus[i], mask);
 
-        len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
-        if (PAGE_SIZE - len < 3) {
-                rcu_read_unlock();
-                free_cpumask_var(mask);
-                return -EINVAL;
-        }
+        len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
         rcu_read_unlock();
-
         free_cpumask_var(mask);
-        len += sprintf(buf + len, "\n");
-        return len;
+
+        return len < PAGE_SIZE ? len : -EINVAL;
 }
 
 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
@@ -1090,8 +1083,7 @@ static ssize_t show_xps_map(struct netdev_queue *queue,
         struct xps_dev_maps *dev_maps;
         cpumask_var_t mask;
         unsigned long index;
-        size_t len = 0;
-        int i;
+        int i, len;
 
         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
                 return -ENOMEM;
@@ -1117,15 +1109,9 @@ static ssize_t show_xps_map(struct netdev_queue *queue,
         }
         rcu_read_unlock();
 
-        len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
-        if (PAGE_SIZE - len < 3) {
-                free_cpumask_var(mask);
-                return -EINVAL;
-        }
-
+        len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
         free_cpumask_var(mask);
-        len += sprintf(buf + len, "\n");
-        return len;
+        return len < PAGE_SIZE ? len : -EINVAL;
 }
 
 static ssize_t store_xps_map(struct netdev_queue *queue,
diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c
index eaa51ddf2368..433424804284 100644
--- a/net/core/sysctl_net_core.c
+++ b/net/core/sysctl_net_core.c
@@ -155,7 +155,7 @@ write_unlock:
                 rcu_read_unlock();
 
                 len = min(sizeof(kbuf) - 1, *lenp);
-                len = cpumask_scnprintf(kbuf, len, mask);
+                len = scnprintf(kbuf, len, "%*pb", cpumask_pr_args(mask));
                 if (!len) {
                         *lenp = 0;
                         goto done;