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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <51EF8F27.3030003@monstr.eu>
Date:	Wed, 24 Jul 2013 10:24:07 +0200
From:	Michal Simek <monstr@...str.eu>
To:	Jingoo Han <jg1.han@...sung.com>
CC:	'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 10:08 AM, Jingoo Han wrote:
> On Wednesday, July 24, 2013 4:42 PM, Michal Simek wrote:
>> 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);
>>
> 
> Hi Michal Simek,
> 
> Just now, I tested that the same problem happens on ARM config.
> Also, I solved it by adding '&' operator.
> 
> '&' operator is necessary as below:
> 
>         dev_dbg(dev, "regs: phys=%pa, virt=%p\n",
>                  &drvdata->regs_phys, drvdata->regs);
>                 ^^^
> 
>         dev_dbg(dev, "fb: phys=%pa, virt=%p, size=%x\n",
>                 &drvdata->fb_phys, drvdata->fb_virt, fbsize);
>                ^^^

ok.

The truth is as I said there are just 5 files in the whole kernel
which are using %pa and if %pa is right way to go we should
probably fix all off them.

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



Download attachment "signature.asc" of type "application/pgp-signature" (264 bytes)