linux-kernel - [PATCH 2/2] chardev: showing minor range for chardev in the output of /proc/devices

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Message-Id: <20190212084739.27602-2-cgxu519@gmx.com>
Date:   Tue, 12 Feb 2019 16:47:39 +0800
From:   Chengguang Xu <cgxu519@....com>
To:     gregkh@...uxfoundation.org
Cc:     viro@...iv.linux.org.uk, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, Chengguang Xu <cgxu519@....com>
Subject: [PATCH 2/2] chardev: showing minor range for chardev in the output of /proc/devices

Currently chardev allows to share major, showing
major with minor range for chardev will be more
helpful.

Signed-off-by: Chengguang Xu <cgxu519@....com>
---
 fs/char_dev.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/char_dev.c b/fs/char_dev.c
index b25b1da097d5..6f00acdeb308 100644
--- a/fs/char_dev.c
+++ b/fs/char_dev.c
@@ -55,7 +55,9 @@ void chrdev_show(struct seq_file *f, off_t offset)
 	mutex_lock(&chrdevs_lock);
 	for (cd = chrdevs[major_to_index(offset)]; cd; cd = cd->next) {
 		if (cd->major == offset)
-			seq_printf(f, "%3d %s\n", cd->major, cd->name);
+			seq_printf(f, "%3d %s (%u-%u)\n", cd->major, cd->name,
+				   cd->baseminor,
+				   cd->baseminor + cd->minorct - 1);
 	}
 	mutex_unlock(&chrdevs_lock);
 }
-- 
2.20.1