linux-kernel - Re: [PATCHv3 07/13] x86/mm: Make PGDIR_SHIFT and PTRS_PER

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Message-ID: <20170807154850.GF3946@tassilo.jf.intel.com>
Date:   Mon, 7 Aug 2017 08:48:50 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Andy Lutomirski <luto@...capital.net>,
        Michal Hocko <mhocko@...nel.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCHv3 07/13] x86/mm: Make PGDIR_SHIFT and PTRS_PER_P4D
 variable

> +#ifdef CONFIG_X86_5LEVEL
> +unsigned int pgdir_shift = 48;
> +unsigned int ptrs_per_p4d = 512;

should be both __read_mostly

> +#ifdef CONFIG_X86_5LEVEL
> +unsigned int pgdir_shift = 48;
> +EXPORT_SYMBOL(pgdir_shift);
> +unsigned int ptrs_per_p4d = 512;
> +EXPORT_SYMBOL(ptrs_per_p4d);
> +#endif

Same.

-Andi