linux-kernel - [RFC 5/8] kmsg: device support in mem class

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Message-id: <1435920595-30879-6-git-send-email-m.niesluchow@samsung.com>
Date:	Fri, 03 Jul 2015 12:49:52 +0200
From:	Marcin Niesluchowski <m.niesluchow@...sung.com>
To:	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-api@...r.kernel.org
Cc:	Jonathan Corbet <corbet@....net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Petr Mladek <pmladek@...e.cz>, Tejun Heo <tj@...nel.org>,
	Kay Sievers <kay@...y.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Joe Perches <joe@...ches.com>,
	Karol Lewandowski <k.lewandowsk@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Marcin Niesluchowski <m.niesluchow@...sung.com>
Subject: [RFC 5/8] kmsg: device support in mem class

Mem class is current class in which kmsg device is holded in.

Mem class is exteded by kmsg_sys devices handling.

Signed-off-by: Marcin Niesluchowski <m.niesluchow@...sung.com>
---
 drivers/char/mem.c | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index e518040..8d5ba0d 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -815,7 +815,11 @@ static int memory_open(struct inode *inode, struct file *filp)
 
 	minor = iminor(inode);
 	if (minor >= ARRAY_SIZE(devlist))
+#ifdef CONFIG_PRINTK
+		minor = KMSG_MINOR;
+#else
 		return -ENXIO;
+#endif
 
 	dev = &devlist[minor];
 	if (!dev->fops)
@@ -837,8 +841,20 @@ static const struct file_operations memory_fops = {
 
 static char *mem_devnode(struct device *dev, umode_t *mode)
 {
-	if (mode && devlist[MINOR(dev->devt)].mode)
-		*mode = devlist[MINOR(dev->devt)].mode;
+	int minor;
+
+	if (!mode)
+		return NULL;
+
+	minor = MINOR(dev->devt);
+
+#ifdef CONFIG_PRINTK
+	if (minor >= ARRAY_SIZE(devlist))
+		kmsg_sys_mode(minor, mode);
+	else
+#endif
+		if (devlist[minor].mode)
+			*mode = devlist[minor].mode;
 	return NULL;
 }
 
-- 
1.9.1

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