linux-kernel - Re: [PATCH] vfio: selftests: fix format conversion compiler warning

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Message-ID: <CALzav=cWEoydGBpf4j5gPWy0TzLoAPP3YeG3VocbeEzytHTFrw@mail.gmail.com>
Date: Wed, 28 Jan 2026 11:21:52 -0800
From: David Matlack <dmatlack@...gle.com>
To: Randy Dunlap <rdunlap@...radead.org>
Cc: Ted Logan <tedlogan@...com>, Alex Williamson <alex@...zbot.org>, Shuah Khan <shuah@...nel.org>, 
	Raghavendra Rao Ananta <rananta@...gle.com>, Alex Mastro <amastro@...com>, kvm@...r.kernel.org, 
	linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org, 
	kernel test robot <lkp@...el.com>
Subject: Re: [PATCH] vfio: selftests: fix format conversion compiler warning

On Wed, Jan 28, 2026 at 11:12 AM Randy Dunlap <rdunlap@...radead.org> wrote:
> On 1/28/26 11:06 AM, David Matlack wrote:
> > On Wed, Jan 28, 2026 at 10:38 AM Ted Logan <tedlogan@...com> wrote:
> >>
> >> Use the standard format conversion macro PRIx64 to generate the
> >> appropriate format conversion for 64-bit integers. Fixes a compiler
> >> warning with -Wformat on i386.
> >>
> >> Signed-off-by: Ted Logan <tedlogan@...com>
> >> Reported-by: kernel test robot <lkp@...el.com>
> >> Closes: https://lore.kernel.org/oe-kbuild-all/202601211830.aBEjmEFD-lkp@intel.com/
> >
> > Thanks for the patch.
> >
> > I've been seeing these i386 reports as well. I find the PRIx64, etc.
> > format specifiers make format strings very hard to read. And I think
> > there were some other issues when building VFIO selftests with i386
> > the last time I tried.
> >
> > I was thinking instead we should just not support i386 builds of VFIO
> > selftests. But I hadn't gotten around to figuring out the right
> > Makefile magic to make that happen.
>
> There are other 32-bit CPUs besides i386.
> Or do only support X86?

At this point I would only call x86_64 and arm64 as supported. At
least that is all I have access to and tested.

If there is legitimate desire to run these tests on 32-bit CPUs, then
we can support it.

Alex, do you test on 32-bit CPUs?