linux-kernel - Re: [PATCH v2] x86/boot/64/clang: Use fixup_pointer() to access '__supported_pte

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Message-ID: <20180508214445.lnqbct6dgrhyxp4a@black.fi.intel.com>
Date:   Wed, 9 May 2018 00:44:45 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     Alexander Potapenko <glider@...gle.com>
Cc:     dave.hansen@...ux.intel.com, mingo@...nel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, mka@...omium.org, dvyukov@...gle.com,
        md@...gle.com
Subject: Re: [PATCH v2] x86/boot/64/clang: Use fixup_pointer() to access
 '__supported_pte_mask'

On Tue, May 08, 2018 at 04:28:29PM +0000, Alexander Potapenko wrote:
> @@ -196,7 +204,8 @@ unsigned long __head __startup_64(unsigned long physaddr,
>  
>  	pmd_entry = __PAGE_KERNEL_LARGE_EXEC & ~_PAGE_GLOBAL;
>  	/* Filter out unsupported __PAGE_KERNEL_* bits: */
> -	pmd_entry &= __supported_pte_mask;
> +	mask_ptr = (pteval_t *)fixup_pointer(&__supported_pte_mask, physaddr);

Do we really need the cast here?

-- 
 Kirill A. Shutemov