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SubjectRe: [PATCH] video: xilinxfb: Fix compilation warning
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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@20110406.104745) 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);
^^^

Best regards,
Jingoo Han

> 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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