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

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Message-Id: <20230911131618.4159437-1-andriy.shevchenko@linux.intel.com>
Date:   Mon, 11 Sep 2023 16:16:18 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     haozhe chang <haozhe.chang@...iatek.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Loic Poulain <loic.poulain@...aro.org>,
        Sergey Ryazanov <ryazanov.s.a@...il.com>,
        Johannes Berg <johannes@...solutions.net>,
        "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>
Subject: [PATCH v2 1/1] wwan: 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).

Reviewed-by: Loic Poulain <loic.poulain@...aro.org>
Reviewed-by: Sergey Ryazanov <ryazanov.s.a@...il.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
v2: added tags (Loic, Sergey), resent after v6.6-rc1 is out (Jakub)
 drivers/net/wwan/wwan_core.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wwan/wwan_core.c b/drivers/net/wwan/wwan_core.c
index 284ab1f56391..87df60916960 100644
--- a/drivers/net/wwan/wwan_core.c
+++ b/drivers/net/wwan/wwan_core.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /* Copyright (c) 2021, Linaro Ltd <loic.poulain@...aro.org> */
 
+#include <linux/bitmap.h>
 #include <linux/err.h>
 #include <linux/errno.h>
 #include <linux/debugfs.h>
@@ -395,7 +396,7 @@ static int __wwan_port_dev_assign_name(struct wwan_port *port, const char *fmt)
 	char buf[0x20];
 	int id;
 
-	idmap = (unsigned long *)get_zeroed_page(GFP_KERNEL);
+	idmap = bitmap_zalloc(max_ports, GFP_KERNEL);
 	if (!idmap)
 		return -ENOMEM;
 
@@ -414,7 +415,7 @@ static int __wwan_port_dev_assign_name(struct wwan_port *port, const char *fmt)
 
 	/* Allocate unique id */
 	id = find_first_zero_bit(idmap, max_ports);
-	free_page((unsigned long)idmap);
+	bitmap_free(idmap);
 
 	snprintf(buf, sizeof(buf), fmt, id);	/* Name generation */
 
-- 
2.40.0.1.gaa8946217a0b