linux-kernel - Re: [PATCH] KVM: selftests: Silence compiler warning in the kvm_page_table

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Date:   Thu, 14 Apr 2022 13:22:39 +0200
From:   Claudio Imbrenda <imbrenda@...ux.ibm.com>
To:     Thomas Huth <thuth@...hat.com>
Cc:     kvm@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Shuah Khan <shuah@...nel.org>, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org, David Hildenbrand <david@...hat.com>
Subject: Re: [PATCH] KVM: selftests: Silence compiler warning in the
 kvm_page_table_test

On Thu, 14 Apr 2022 12:30:31 +0200
Thomas Huth <thuth@...hat.com> wrote:

> When compiling kvm_page_table_test.c, I get this compiler warning
> with gcc 11.2:
> 
> kvm_page_table_test.c: In function 'pre_init_before_test':
> ../../../../tools/include/linux/kernel.h:44:24: warning: comparison of
>  distinct pointer types lacks a cast
>    44 |         (void) (&_max1 == &_max2);              \
>       |                        ^~
> kvm_page_table_test.c:281:21: note: in expansion of macro 'max'
>   281 |         alignment = max(0x100000, alignment);
>       |                     ^~~
> 
> Fix it by adjusting the type of the absolute value.
> 
> Signed-off-by: Thomas Huth <thuth@...hat.com>

Reviewed-by: Claudio Imbrenda <imbrenda@...ux.ibm.com>

> ---
>  tools/testing/selftests/kvm/kvm_page_table_test.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/kvm/kvm_page_table_test.c b/tools/testing/selftests/kvm/kvm_page_table_test.c
> index ba1fdc3dcf4a..2c4a7563a4f8 100644
> --- a/tools/testing/selftests/kvm/kvm_page_table_test.c
> +++ b/tools/testing/selftests/kvm/kvm_page_table_test.c
> @@ -278,7 +278,7 @@ static struct kvm_vm *pre_init_before_test(enum vm_guest_mode mode, void *arg)
>  	else
>  		guest_test_phys_mem = p->phys_offset;
>  #ifdef __s390x__
> -	alignment = max(0x100000, alignment);
> +	alignment = max(0x100000UL, alignment);
>  #endif
>  	guest_test_phys_mem = align_down(guest_test_phys_mem, alignment);
>