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Thu, 29 Jan 2026 13:50:41 -0500 (EST) Date: Thu, 29 Jan 2026 11:50:39 -0700 From: Alex Williamson To: David Matlack Cc: Randy Dunlap , Ted Logan , Shuah Khan , Raghavendra Rao Ananta , Alex Mastro , kvm@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, kernel test robot Subject: Re: [PATCH] vfio: selftests: fix format conversion compiler warning Message-ID: <20260129115039.10fe3c76@shazbot.org> In-Reply-To: References: <20260128183750.1240176-1-tedlogan@fb.com> <9d992d4a-1aea-42a7-aa79-4ede80293f9b@infradead.org> X-Mailer: Claws Mail 4.3.1 (GTK 3.24.51; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On Wed, 28 Jan 2026 11:21:52 -0800 David Matlack wrote: > On Wed, Jan 28, 2026 at 11:12=E2=80=AFAM Randy Dunlap wrote: > > On 1/28/26 11:06 AM, David Matlack wrote: =20 > > > On Wed, Jan 28, 2026 at 10:38=E2=80=AFAM Ted Logan = wrote: =20 > > >> > > >> 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 > > >> Reported-by: kernel test robot > > >> Closes: https://lore.kernel.org/oe-kbuild-all/202601211830.aBEjmEFD-= lkp@intel.com/ =20 > > > > > > 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. =20 > > > > There are other 32-bit CPUs besides i386. > > Or do only support X86? =20 >=20 > At this point I would only call x86_64 and arm64 as supported. At > least that is all I have access to and tested. >=20 > If there is legitimate desire to run these tests on 32-bit CPUs, then > we can support it. >=20 > Alex, do you test on 32-bit CPUs? No, I haven't tested 32-bit in a very long time. I'd like to think it works, but I'm not aware of any worthwhile use case. Thanks, Alex