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net: minor __dev_alloc_name() optimization 

__dev_alloc_name() allocates a private zeroed page,
then sets bits in it while iterating through net devices.

It can use __set_bit() to avoid unnecessary locked operations.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20220203064609.3242863-1-eric.dumazet@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2022-02-02 22:46:09 -08:00 committed by Jakub Kicinski
parent c59400a68c
commit 25ee1660a5
1 changed files with 2 additions and 2 deletions
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4
net/core/dev.c
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@ -1037,7 +1037,7 @@ static int __dev_alloc_name(struct net *net, const char *name, char *buf)
/* avoid cases where sscanf is not exact inverse of printf */
snprintf(buf, IFNAMSIZ, name, i);
if (!strncmp(buf, name_node->name, IFNAMSIZ))
set_bit(i, inuse);
__set_bit(i, inuse);
}
if (!sscanf(d->name, name, &i))
continue;
@ -1047,7 +1047,7 @@ static int __dev_alloc_name(struct net *net, const char *name, char *buf)
/* avoid cases where sscanf is not exact inverse of printf */
snprintf(buf, IFNAMSIZ, name, i);
if (!strncmp(buf, d->name, IFNAMSIZ))
set_bit(i, inuse);
__set_bit(i, inuse);
}
i = find_first_zero_bit(inuse, max_netdevices);