linux-kernel - Re: [PATCH 5/8] x86/mm: Add basic defines/helpers for CONFIG_X86

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Date:   Tue, 28 Mar 2017 08:11:21 +0200
From:   Ingo Molnar <mingo@...nel.org>
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>, Andi Kleen <ak@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Andy Lutomirski <luto@...capital.net>,
        linux-arch@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/8] x86/mm: Add basic defines/helpers for
 CONFIG_X86_5LEVEL


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

> +#ifdef CONFIG_X86_5LEVEL
> +
> +/*
> + * PGDIR_SHIFT determines what a top-level page table entry can map
> + */
> +#define PGDIR_SHIFT	48
> +#define PTRS_PER_PGD	512
> +
> +/*
> + * 4rd level page in 5-level paging case

4th.

> + */
> +#define P4D_SHIFT	39
> +#define PTRS_PER_P4D	512
> +#define P4D_SIZE	(_AC(1, UL) << P4D_SHIFT)
> +#define P4D_MASK	(~(P4D_SIZE - 1))
> +
> +#else  /* CONFIG_X86_5LEVEL */

Single space suffices before teh comment.

> +
>  /*
>   * PGDIR_SHIFT determines what a top-level page table entry can map
>   */
>  #define PGDIR_SHIFT	39
>  #define PTRS_PER_PGD	512
>  
> +#endif  /* CONFIG_X86_5LEVEL */

Ditto.

> +#ifdef CONFIG_X86_5LEVEL
> +/**
> + * p4d_set_huge - setup kernel P4D mapping
> + *
> + * No 512GB pages yet -- always return 0
> + *
> + * Returns 1 on success and 0 on failure.
> + */
> +int p4d_set_huge(p4d_t *p4d, phys_addr_t addr, pgprot_t prot)
> +{
> +	return 0;
> +}

The last comment line can be deleted I suppose.

Thanks,

	Ingo