linux-kernel - [PATCH] null_blk: Fix correct parameter desc for the module

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Message-Id: <20250815043033.1534949-1-zhanggenjian@126.com>
Date: Fri, 15 Aug 2025 12:30:33 +0800
From: Genjian <zhanggenjian@....com>
To: axboe@...nel.dk,
	dlemoal@...nel.org,
	shinichiro.kawasaki@....com,
	johannes.thumshirn@....com,
	kch@...dia.com,
	zhengqixing@...wei.com,
	willy@...radead.org,
	namcao@...utronix.de,
	vincent.fu@...sung.com
Cc: linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	zhanggenjian@....com,
	Genjian Zhang <zhanggenjian@...inos.cn>
Subject: [PATCH] null_blk: Fix correct parameter desc for the module

From: Genjian Zhang <zhanggenjian@...inos.cn>

When executing modinfo null_blk, there is an error in the description
of module parameter mbps, and the output information of cache_size is
incomplete.The output of modinfo before and after applying this patch
is as follows:

Before:
[...]
parm:           cache_size:ulong
[...]
parm:           mbps:Cache size in MiB for memory-backed device.
		Default: 0 (none) (uint)
[...]

After:
[...]
parm:           cache_size:Cache size in MiB for memory-backed device.
		Default: 0 (none) (ulong)
[...]
parm:           mbps:Limit maximum bandwidth (in MiB/s).
		Default: 0 (no limit) (uint)
[...]

Fixes: 058efe000b31 ("null_blk: add module parameters for 4 options")

Signed-off-by: Genjian Zhang <zhanggenjian@...inos.cn>
---
 drivers/block/null_blk/main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/block/null_blk/main.c b/drivers/block/null_blk/main.c
index 91642c9a3b29..f982027e8c85 100644
--- a/drivers/block/null_blk/main.c
+++ b/drivers/block/null_blk/main.c
@@ -223,7 +223,7 @@ MODULE_PARM_DESC(discard, "Support discard operations (requires memory-backed nu
 
 static unsigned long g_cache_size;
 module_param_named(cache_size, g_cache_size, ulong, 0444);
-MODULE_PARM_DESC(mbps, "Cache size in MiB for memory-backed device. Default: 0 (none)");
+MODULE_PARM_DESC(cache_size, "Cache size in MiB for memory-backed device. Default: 0 (none)");
 
 static bool g_fua = true;
 module_param_named(fua, g_fua, bool, 0444);
-- 
2.25.1