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From:   Bruno Goncalves <bgoncalv@redhat.com>
Date:   Wed, 6 Apr 2022 16:17:13 +0200
Message-ID: <CA+QYu4omi2irqUpDi_3POT8djdgg3q0ZVujdE1jfLPwsTxjB5w@mail.gmail.com>
Subject: =?UTF-8?Q?special=5Finsns=2Eh=3A36=3A9=3A_error=3A_array_subscript_0_is_ou?=
        =?UTF-8?Q?tside_array_bounds_of_=E2=80=98unsigned_int=5B0=5D=E2=80=99_=5B=2DWerror=3Darray=2Db?=
        =?UTF-8?Q?ounds=5D?=
To:     linux-kselftest@vger.kernel.org,
        LKML <linux-kernel@vger.kernel.org>
Cc:     CKI Project <cki-project@redhat.com>
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Hello,

Trying to build mainline kernel with gcc12 and selftests we get the
following error:

00:01:22 In function =E2=80=98native_read_cr2=E2=80=99,
00:01:22     inlined from =E2=80=98vmx_vcpu_enter_exit=E2=80=99 at
arch/x86/kvm/vmx/vmx.c:6772:24:
00:01:22 ./arch/x86/include/asm/special_insns.h:36:9: error: array
subscript 0 is outside array bounds of =E2=80=98unsigned int[0]=E2=80=99
[-Werror=3Darray-bounds]
00:01:22    36 |         asm volatile("mov %%cr2,%0\n\t" : "=3Dr" (val)
: __FORCE_ORDER);
00:01:22       |         ^~~
00:01:22 In function =E2=80=98native_read_cr2=E2=80=99,
00:01:22     inlined from =E2=80=98vmx_vcpu_enter_exit=E2=80=99 at
arch/x86/kvm/vmx/vmx.c:6778:19:
00:01:22 ./arch/x86/include/asm/special_insns.h:36:9: error: array
subscript 0 is outside array bounds of =E2=80=98unsigned int[0]=E2=80=99
[-Werror=3Darray-bounds]
00:01:22    36 |         asm volatile("mov %%cr2,%0\n\t" : "=3Dr" (val)
: __FORCE_ORDER);
00:01:22       |         ^~~
00:01:22 cc1: all warnings being treated as errors
00:01:22 make[4]: *** [scripts/Makefile.build:288:
arch/x86/kvm/vmx/vmx.o] Error 1
00:01:22 make[3]: *** [scripts/Makefile.build:550: arch/x86/kvm] Error 2


Full build log:
https://s3.us-east-1.amazonaws.com/arr-cki-prod-datawarehouse-public/datawa=
rehouse-public/2022/04/05/509694021/build_x86_64_redhat:2295283495/build.lo=
g

build config: https://s3.us-east-1.amazonaws.com/arr-cki-prod-datawarehouse=
-public/datawarehouse-public/2022/04/05/509694021/build_x86_64_redhat:22952=
83495/kernel-mainline.kernel.org-x86_64-3e732ebf7316ac83e8562db7e64cc68aec3=
90a18.config

Thanks,
Bruno Goncalves