Re: [PATCH 5.15.y RESEND] KVM: arm64: sys_regs: disable -Wuninitialized-const-pointer warning

[Tiffany Yang <ynaffit@google.com>]

Justin Stitt <justinstitt@google.com> writes:

> A new warning in Clang 22 [1] complains that @clidr passed to
> get_clidr_el1() is an uninitialized const pointer. get_clidr_el1()
> doesn't really care since it casts away the const-ness anyways -- it is
> a false positive.

> |  ../arch/arm64/kvm/sys_regs.c:2838:23: warning: variable 'clidr' is  
> uninitialized when passed as a const pointer argument here  
> [-Wuninitialized-const-pointer]
> |   2838 |         get_clidr_el1(NULL, &clidr); /* Ugly... */
> |        |                              ^~~~~

> This patch isn't needed for anything past 6.1 as this code section was
> reworked in Commit 7af0c2534f4c ("KVM: arm64: Normalize cache
> configuration"). Since there is no upstream equivalent, this patch just
> needs to be applied to 5.15.


This error has also been showing up in 5.10 since KernelCI started using
clang-21.

> Disable this warning for sys_regs.o with an iron fist as it doesn't make
> sense to waste maintainer's time or potentially break builds by
> backporting large changelists from 6.2+.

> Cc: stable@vger.kernel.org
> Fixes: 7c8c5e6a9101e ("arm64: KVM: system register handling")
> Link:  
> https://github.com/llvm/llvm-project/commit/00dacf8c22f065cb52efb14cd091d441f19b319e  
> [1]
> Reviewed-by: Nathan Chancellor <nathan@kernel.org>
> Signed-off-by: Justin Stitt <justinstitt@google.com>
<snip>

Reviewed-by: Tiffany Yang <ynaffit@google.com>

-- 
Tiffany Y. Yang