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

Justin Stitt [off-list ref] 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 <redacted>

-- 
Tiffany Y. Yang