linux-kernel - [PATCH] mtdchar.c: fix different address space noise

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Date:	Fri, 15 Jan 2010 11:25:38 -0700
From:	H Hartley Sweeten <hartleys@...ionengravers.com>
To:	Linux Kernel <linux-kernel@...r.kernel.org>,
	linux-mtd@...ts.infradead.org
Cc:	dwmw2@...radead.org
Subject: [PATCH] mtdchar.c: fix different address space noise

mtdchar.c: fix different address space noise

In mtd_ioctl MEMGETREGIONINFO the region_user_info pointer ur
is cast in __kernel space. This produces a number of sparse warnings
like:

warning: cast removes address space of expression
warning: incorrect type in initializer (different address spaces)
   expected unsigned int const [noderef] <asn:1>*register __p
   got unsigned int *<noident>

Since argp is already a void __user * just use it dirrectly without
the cast and make ur a __user *.

Signed-off-by: H Hartley Sweeten <hsweeten@...ionengravers.com>
Cc: David Woodhouse <dwmw2@...radead.org>

---

diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index 5b081cb..0a85085 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -482,7 +482,7 @@ static int mtd_ioctl(struct inode *inode, struct file *file,
 	{
 		uint32_t ur_idx;
 		struct mtd_erase_region_info *kr;
-		struct region_info_user *ur = (struct region_info_user *) argp;
+		struct region_info_user __user *ur = argp;
 
 		if (get_user(ur_idx, &(ur->regionindex)))
 			return -EFAULT;
--
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