linux-kernel - Re: [PATCH] video: xilinxfb: Fix compilation warning

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Date:	Wed, 24 Jul 2013 09:41:36 +0200
From:	Michal Simek <monstr@...str.eu>
To:	monstr@...str.eu
CC:	Jingoo Han <jg1.han@...sung.com>,
	'Michal Simek' <michal.simek@...inx.com>,
	'Jean-Christophe Plagniol-Villard' <plagnioj@...osoft.com>,
	'Tomi Valkeinen' <tomi.valkeinen@...com>,
	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	'Stepan Moskovchenko' <stepanm@...eaurora.org>
Subject: Re: [PATCH] video: xilinxfb: Fix compilation warning

On 07/24/2013 09:18 AM, Michal Simek wrote:
> On 07/24/2013 08:00 AM, Jingoo Han wrote:
>> On Wednesday, July 24, 2013 2:32 PM, Michal Simek wrote:
>>>
>>> regs_phys is phys_addr_t (u32 or u64).
>>> Lets retype it to u64.
>>>
>>> Fixes compilation warning introduced by:
>>> video: xilinxfb: Use drvdata->regs_phys instead of physaddr
>>> (sha1: c88fafef0135e1e1c3e23c3e32ccbeeabc587f81)
>>
>> CC'ed Stepan Moskovchenko
>>
>>
>> phys_addr_t is defined as below:
>>
>> #ifdef CONFIG_PHYS_ADDR_T_64BIT
>> typedef u64 phys_addr_t;
>> #else
>> typedef u32 phys_addr_t;
>> #endif
>>
>> According to 'Documentation/printk-formats.txt',
>> Physical addresses:
>>        %pa     0x01234567 or 0x0123456789abcdef
>>        For printing a phys_addr_t type (and its derivatives, such as
>>        resource_size_t) which can vary based on build options, regardless of
>>        the width of the CPU data path. Passed by reference.
>>
>> Thus, '%pa' option looks proper, instead of casting (unsigned long long).
>>
>> 		dev_dbg(dev, "regs: phys=%pa, virt=%p\n", drvdata->regs_phys,
>> 					drvdata->regs);
>>
> 
> Ah. Wasn't aware about that.
> Will retest.

On ppc44x_defconfig

$ powerpc-unknown-linux-gnu-gcc --version
powerpc-unknown-linux-gnu-gcc (crosstool-NG-svn_unknown@...10406.104745) 4.3.2

This fix
diff --git a/drivers/video/xilinxfb.c b/drivers/video/xilinxfb.c
index 79175a6..a9a1167 100644
--- a/drivers/video/xilinxfb.c
+++ b/drivers/video/xilinxfb.c
@@ -341,12 +341,12 @@ static int xilinxfb_assign(struct platform_device *pdev,

        if (drvdata->flags & BUS_ACCESS_FLAG) {
                /* Put a banner in the log (for DEBUG) */
-               dev_dbg(dev, "regs: phys=%llx, virt=%p\n",
-                       (unsigned long long)drvdata->regs_phys, drvdata->regs);
+               dev_dbg(dev, "regs: phys=%pa, virt=%p\n",
+                       drvdata->regs_phys, drvdata->regs);
        }
        /* Put a banner in the log (for DEBUG) */
-       dev_dbg(dev, "fb: phys=%llx, virt=%p, size=%x\n",
-               (unsigned long long)drvdata->fb_phys, drvdata->fb_virt, fbsize);
+       dev_dbg(dev, "fb: phys=%pa, virt=%p, size=%x\n",
+               drvdata->fb_phys, drvdata->fb_virt, fbsize);

        return 0;       /* success */

Generates two warnings even it should be ok according to link to specification you sent.
  CC [M]  drivers/video/xilinxfb.o
drivers/video/xilinxfb.c: In function 'xilinxfb_assign':
drivers/video/xilinxfb.c:344: warning: format '%p' expects type 'void *', but argument 4 has type 'phys_addr_t'
drivers/video/xilinxfb.c:348: warning: format '%p' expects type 'void *', but argument 4 has type 'dma_addr_t'

On microblaze toolchain I see the same warnings. (mmu_defconfig)

I have also grepped the kernel and I see that it is used in 4 c files which seems to me
weird because phy_addr_t or dma_addr_t are used on a lot of places.

Thanks,
Michal

-- 
Michal Simek, Ing. (M.Eng), OpenPGP -> KeyID: FE3D1F91
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel - Microblaze cpu - http://www.monstr.eu/fdt/
Maintainer of Linux kernel - Xilinx Zynq ARM architecture
Microblaze U-BOOT custodian and responsible for u-boot arm zynq platform



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