linux-kernel - Re: [PATCH v8 4/6] x86/PCI: Enable a 64bit BAR on AMD Family 15h (Models 30h-3fh) Processors v4

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Date:   Tue, 11 Jul 2017 20:50:18 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     kbuild test robot <lkp@...el.com>
Cc:     Christian König <deathsimple@...afone.de>,
        kbuild-all@...org, Bjorn Helgaas <helgaas@...nel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        dri-devel@...ts.freedesktop.org,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        amd-gfx@...ts.freedesktop.org
Subject: Re: [PATCH v8 4/6] x86/PCI: Enable a 64bit BAR on AMD Family 15h
 (Models 30h-3fh) Processors v4

On Tue, Jul 11, 2017 at 3:07 PM, kbuild test robot <lkp@...el.com> wrote:

>         make ARCH=i386

Yeah, either this code shouldn't have been built on 32-bit arch at
all, or be portable.

>    arch/x86/pci/fixup.c: In function 'pci_amd_enable_64bit_bar':
>>> arch/x86/pci/fixup.c:674:15: warning: large integer implicitly truncated to unsigned type [-Woverflow]
>      res->start = 0x100000000ull;
>                   ^~~~~~~~~~~~~~
>    arch/x86/pci/fixup.c:675:13: warning: large integer implicitly truncated to unsigned type [-Woverflow]
>      res->end = 0xfd00000000ull - 1;
>                 ^~~~~~~~~~~~~~~
>>> arch/x86/pci/fixup.c:686:22: warning: right shift count >= width of type [-Wshift-count-overflow]

I suppose explicit casting will help.

>      high = ((res->start >> 40) & AMD_141b_MMIO_HIGH_MMIOBASE_MASK) |
>                          ^~
>    arch/x86/pci/fixup.c:687:21: warning: right shift count >= width of type [-Wshift-count-overflow]
>       ((((res->end + 1) >> 40) << AMD_141b_MMIO_HIGH_MMIOLIMIT_SHIFT)
>                         ^~

These can be done via upper_32_bits() + shift.

-- 
With Best Regards,
Andy Shevchenko