linux-kernel - Re: [PATCH] Fix pointer cast for 32 bits arch

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Date:	Mon, 13 Apr 2015 12:10:20 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Peter Senna Tschudin <peter.senna@...il.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Loic Pefferkorn <loic@...cp.eu>, Alan <alan@...ux.intel.com>,
	Jun Tian <jun.j.tian@...el.com>,
	Octavian Purdila <octavian.purdila@...el.com>,
	Garret Kelly <garret.kelly@...il.com>,
	kristina.martsenko@...il.com, Nick Kralevich <nnk@...gle.com>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Fix pointer cast for 32 bits arch

On Sun, Apr 12, 2015 at 11:26:43AM +0200, Peter Senna Tschudin wrote:
> Sparse compalins about casting void * to u64 on i386.
> Change the cast to resource_size_t.
> 
> Signed-off-by: Peter Senna Tschudin <peter.senna@...il.com>
> ---
> 
> Tested by compilation only. Tested for x86 and x86_64.
> 
>  drivers/staging/goldfish/goldfish_nand.c | 3 ++-
>  include/linux/goldfish.h                 | 2 +-
>  2 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/staging/goldfish/goldfish_nand.c b/drivers/staging/goldfish/goldfish_nand.c
> index d68f216..738fdc4 100644
> --- a/drivers/staging/goldfish/goldfish_nand.c
> +++ b/drivers/staging/goldfish/goldfish_nand.c
> @@ -87,7 +87,8 @@ static u32 goldfish_nand_cmd(struct mtd_info *mtd, enum nand_cmd cmd,
>  		writel((u32)(addr >> 32), base + NAND_ADDR_HIGH);
>  		writel((u32)addr, base + NAND_ADDR_LOW);
>  		writel(len, base + NAND_TRANSFER_SIZE);
> -		gf_write64((u64)ptr, base + NAND_DATA, base + NAND_DATA_HIGH);
> +		gf_write64((resource_size_t)ptr, base + NAND_DATA,
> +			   base + NAND_DATA_HIGH);

write64 is a misleading name because it only writes 32 bits on 32 bit
systems.

Are you sure it's a resource_size_t?  If that's really true then this
code needs a lot more work.  The ifdef in gf_write64() should be
CONFIG_PHYS_ADDR_T_64BIT and ops->datbuf needs to updated.  It would be
a lot of changes...

I *think* but I'm not positive that gf_write64 should just take a void
pointer like this:

diff --git a/drivers/staging/goldfish/goldfish_nand.c b/drivers/staging/goldfish/goldfish_nand.c
index 213877a..92d6479 100644
--- a/drivers/staging/goldfish/goldfish_nand.c
+++ b/drivers/staging/goldfish/goldfish_nand.c
@@ -87,7 +87,7 @@ static u32 goldfish_nand_cmd(struct mtd_info *mtd, enum nand_cmd cmd,
 		writel((u32)(addr >> 32), base + NAND_ADDR_HIGH);
 		writel((u32)addr, base + NAND_ADDR_LOW);
 		writel(len, base + NAND_TRANSFER_SIZE);
-		gf_write64((u64)ptr, base + NAND_DATA, base + NAND_DATA_HIGH);
+		gf_write64(ptr, base + NAND_DATA, base + NAND_DATA_HIGH);
 		writel(cmd, base + NAND_COMMAND);
 		rv = readl(base + NAND_RESULT);
 	}
diff --git a/include/linux/goldfish.h b/include/linux/goldfish.h
index 569236e..4cdb913 100644
--- a/include/linux/goldfish.h
+++ b/include/linux/goldfish.h
@@ -3,12 +3,12 @@
 
 /* Helpers for Goldfish virtual platform */
 
-static inline void gf_write64(unsigned long data,
+static inline void gf_write64(void *data,
 		void __iomem *portl, void __iomem *porth)
 {
-	writel((u32)data, portl);
+	writel((u32)(unsigned long)data, portl);
 #ifdef CONFIG_64BIT
-	writel(data>>32, porth);
+	writel((unsigned long)data >> 32, porth);
 #endif
 }
 
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