Re: [PATCH] KVM: arm64: nVHE: gen-hyprel: Silent build warnings

[Marc Zyngier <maz@kernel.org>]

On Thu, 10 Oct 2024 09:12:29 +0100,
"tianjia.zhang" <tianjia.zhang@linux.alibaba.com> wrote:
> 
> 
> 
> On 10/9/24 7:07 PM, Marc Zyngier wrote:
> > On Wed, 09 Oct 2024 09:57:51 +0100,
> > Tianjia Zhang <tianjia.zhang@linux.alibaba.com> wrote:
> >> 
> >> This patch silent the some mismatch format build warnings
> >> with clang, like:
> >> 
> >>    arch/arm64/kvm/hyp/nvhe/gen-hyprel.c:233:2: warning: format specifies
> >>    type 'unsigned long' but the argument has type 'Elf64_Off'
> >>    (aka 'unsigned long long') [-Wformat]
> >>      233 |         assert_ne(off, 0UL, "%lu");
> >>          |         ^~~~~~~~~~~~~~~~~~~~~~~~~~
> >>          |                              %llu
> >>    arch/arm64/kvm/hyp/nvhe/gen-hyprel.c:193:34: note: expanded from macro 'assert_ne'
> >>      193 | #define assert_ne(lhs, rhs, fmt)        assert_op(lhs, rhs, fmt, !=)
> >>          |                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >>    arch/arm64/kvm/hyp/nvhe/gen-hyprel.c:188:19: note: expanded from macro 'assert_op'
> >>      187 |                                 " failed (lhs=" fmt ", rhs=" fmt        \
> >>          |                                                 ~~~
> >>      188 |                                 ", line=%d)", _lhs, _rhs, __LINE__);    \
> >>          |                                               ^~~~
> >>    arch/arm64/kvm/hyp/nvhe/gen-hyprel.c:167:17: note: expanded from macro 'fatal_error'
> >>      166 |                 fprintf(stderr, "error: %s: " fmt "\n",                 \
> >>          |                                               ~~~
> >>      167 |                         elf.path, ## __VA_ARGS__);                      \
> >>          |                                      ^~~~~~~~~~~
> >> 
> >> Signed-off-by: Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
> > 
> > I don't see these warnings. What version of LLVM are you using?
> > 
> 
> I compiled the kernel on Apple Silicon M3 Pro in macOS 15.0.1, Maybe this is
> a special scenario that is rarely used.
> 
> Details of clang:
> 
>     # clang --version
>     Homebrew clang version 19.1.1
>     Target: arm64-apple-darwin24.0.0
>     Thread model: posix
>     InstalledDir: /opt/homebrew/Cellar/llvm/19.1.1/bin

What I have is similar enough:

ClangBuiltLinux clang version 19.1.1 (https://github.com/llvm/llvm-project.git d401987fe349a87c53fe25829215b080b70c0c1a)
Target: aarch64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/maz/hot-poop/llvm/llvm-19.1.1-aarch64/bin

and yet this doesn't fire. Can you try with a compiler actually
targeting with Linux instead of MacOS?

Thanks,

	M.

-- 
Without deviation from the norm, progress is not possible.