linux-kernel - Re: [PATCHv7 08/19] x86/mm: Make PGDIR_SHIFT and PTRS_PER

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Message-ID: <20170928082138.ayuwbf6jhy6yyqu4@gmail.com>
Date:   Thu, 28 Sep 2017 10:21:38 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...capital.net>,
        Cyrill Gorcunov <gorcunov@...nvz.org>,
        Borislav Petkov <bp@...e.de>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCHv7 08/19] x86/mm: Make PGDIR_SHIFT and PTRS_PER_P4D
 variable


* Kirill A. Shutemov <kirill.shutemov@...ux.intel.com> wrote:

>  #define P4D_SHIFT	39
> -#define PTRS_PER_P4D	512
> +#define __PTRS_PER_P4D	512
> +#define PTRS_PER_P4D	ptrs_per_p4d
>  #define P4D_SIZE	(_AC(1, UL) << P4D_SHIFT)
>  #define P4D_MASK	(~(P4D_SIZE - 1))

PTRS_PER_P4D_MAX would be a better name than random underscores ...

Thanks,

	Ingo