linux-next: Build failure in the final build

[Mark Brown]

On Tue, Jul 07, 2026 at 01:11:55PM +0100, Mark Brown wrote:

> After merging the kvm-arm-fixes tree, today's linux-next build
> (arm64 defconfig) started generating warnings:

> In file included from /tmp/next/build/include/linux/limits.h:7,
>                  from /tmp/next/build/include/linux/overflow.h:6,
>                  from /tmp/next/build/include/linux/bits.h:32,
>                  from /tmp/next/build/arch/arm64/include/asm/kvm_pgtable.h:10,
>                  from /tmp/next/build/arch/arm64/kvm/hyp/pgtable.c:11:
> /tmp/next/build/arch/arm64/kvm/hyp/pgtable.c: In function 'kvm_pgtable_stage2_relax_perms':
> /tmp/next/build/include/vdso/limits.h:8:25: warning: overflow in conversion from 'int' to 's8' {aka 'signed char'} changes value from '2147483647' to '-1' [-Woverflow]
>     8 | #define INT_MAX         ((int)(~0U >> 1))
>       |                         ^
> /tmp/next/build/arch/arm64/include/asm/tlbflush.h:131:33: note: in expansion of macro 'INT_MAX'
>   131 | #define TLBI_TTL_UNKNOWN        INT_MAX
>       |                                 ^~~~~~~
> /tmp/next/build/arch/arm64/kvm/hyp/pgtable.c:1361:20: note: in expansion of macro 'TLBI_TTL_UNKNOWN'
>  1361 |         s8 level = TLBI_TTL_UNKNOWN;
>       |                    ^~~~~~~~~~~~~~~~
> In file included from /tmp/next/build/include/linux/limits.h:7,
>                  from /tmp/next/build/include/linux/overflow.h:6,
>                  from /tmp/next/build/include/linux/bits.h:32,
>                  from /tmp/next/build/arch/arm64/include/asm/kvm_pgtable.h:10,
>                  from /tmp/next/build/arch/arm64/kvm/hyp/nvhe/../pgtable.c:11:
> /tmp/next/build/arch/arm64/kvm/hyp/nvhe/../pgtable.c: In function 'kvm_pgtable_stage2_relax_perms':
> /tmp/next/build/include/vdso/limits.h:8:25: warning: overflow in conversion from 'int' to 's8' {aka 'signed char'} changes value from '2147483647' to '-1' [-Woverflow]
>     8 | #define INT_MAX         ((int)(~0U >> 1))
>       |                         ^
> /tmp/next/build/arch/arm64/include/asm/tlbflush.h:131:33: note: in expansion of macro 'INT_MAX'
>   131 | #define TLBI_TTL_UNKNOWN        INT_MAX
>       |                                 ^~~~~~~
> /tmp/next/build/arch/arm64/kvm/hyp/nvhe/../pgtable.c:1361:20: note: in expansion of macro 'TLBI_TTL_UNKNOWN'
>  1361 |         s8 level = TLBI_TTL_UNKNOWN;
>       |                    ^~~~~~~~~~~~~~~~

> Caused by commit

>    100baf0184896 (KVM: arm64: Ensure level is always initialized when relaxing perms)

> I imagine this will cause an allyesconfig build failure when I get to
> that due to -Werror.

Confirmed, nothing later in the merge fixed the warning so -Werror
triggered breaking arm64 allyesconfig.

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