linux-next: build warnings after merge of the kvm-arm-fixes tree

[Mark Brown]

Hi all,

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.

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