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Message-ID: <1acf4b3a-71b7-3412-fe83-a9b730530583@collabora.com>
Date:   Tue, 6 Jun 2023 12:55:16 +0500
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Cc:     Muhammad Usama Anjum <usama.anjum@collabora.com>,
        David Hildenbrand <david@redhat.com>,
        Peter Xu <peterx@redhat.com>, Shuah Khan <shuah@kernel.org>,
        Nathan Chancellor <nathan@kernel.org>, linux-mm@kvack.org,
        linux-kselftest@vger.kernel.org,
        LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v3 07/11] selftests/mm: fix a "possibly uninitialized"
 warning in pkey-x86.h
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To:     John Hubbard <jhubbard@nvidia.com>,
        Andrew Morton <akpm@linux-foundation.org>
References: <20230606071637.267103-1-jhubbard@nvidia.com>
 <20230606071637.267103-8-jhubbard@nvidia.com>
From:   Muhammad Usama Anjum <usama.anjum@collabora.com>
In-Reply-To: <20230606071637.267103-8-jhubbard@nvidia.com>
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On 6/6/23 12:16 PM, John Hubbard wrote:
> This fixes a real bug, too, because xstate_size()  was assuming that
> the stack variable xstate_size was initialized to zero. That's not
> guaranteed nor even especially likely.
> 
> Reviewed-by: David Hildenbrand <david@redhat.com>
> Cc: Peter Xu <peterx@redhat.com>
> Signed-off-by: John Hubbard <jhubbard@nvidia.com>
Tested-by: Muhammad Usama Anjum <usama.anjum@collabora.com>

> ---
>  tools/testing/selftests/mm/pkey-x86.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/mm/pkey-x86.h b/tools/testing/selftests/mm/pkey-x86.h
> index 72c14cd3ddc7..e32ae8a1cd99 100644
> --- a/tools/testing/selftests/mm/pkey-x86.h
> +++ b/tools/testing/selftests/mm/pkey-x86.h
> @@ -132,7 +132,7 @@ int pkey_reg_xstate_offset(void)
>  	unsigned int ecx;
>  	unsigned int edx;
>  	int xstate_offset;
> -	int xstate_size;
> +	int xstate_size = 0;
>  	unsigned long XSTATE_CPUID = 0xd;
>  	int leaf;
>  

-- 
BR,
Muhammad Usama Anjum