linux-kernel - [PATCH v2 1/1] net: core: Use the bitmap API to allocate bitmaps

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Message-Id: <20230913110957.485237-1-andriy.shevchenko@linux.intel.com>
Date:   Wed, 13 Sep 2023 14:09:57 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Sergey Ryazanov <ryazanov.s.a@...il.com>,
        Simon Horman <horms@...nel.org>
Subject: [PATCH v2 1/1] net: core: Use the bitmap API to allocate bitmaps

Use bitmap_zalloc() and bitmap_free() instead of hand-writing them.
It is less verbose and it improves the type checking and semantic.

While at it, add missing header inclusion (should be bitops.h,
but with the above change it becomes bitmap.h).

Suggested-by: Sergey Ryazanov <ryazanov.s.a@...il.com>
Reviewed-by: Simon Horman <horms@...nel.org>
Link: https://lore.kernel.org/r/20230911154534.4174265-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
v2: added tags (Simon), sent separately from the series (Paolo)
 net/core/dev.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index ccff2b6ef958..85df22f05c38 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -69,7 +69,7 @@
  */
 
 #include <linux/uaccess.h>
-#include <linux/bitops.h>
+#include <linux/bitmap.h>
 #include <linux/capability.h>
 #include <linux/cpu.h>
 #include <linux/types.h>
@@ -1080,7 +1080,7 @@ static int __dev_alloc_name(struct net *net, const char *name, char *buf)
 			return -EINVAL;
 
 		/* Use one page as a bit array of possible slots */
-		inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
+		inuse = bitmap_zalloc(max_netdevices, GFP_ATOMIC);
 		if (!inuse)
 			return -ENOMEM;
 
@@ -1109,7 +1109,7 @@ static int __dev_alloc_name(struct net *net, const char *name, char *buf)
 		}
 
 		i = find_first_zero_bit(inuse, max_netdevices);
-		free_page((unsigned long) inuse);
+		bitmap_free(inuse);
 	}
 
 	snprintf(buf, IFNAMSIZ, name, i);
-- 
2.40.0.1.gaa8946217a0b