linux-kernel - Re: mmotm 2014-04-22-15-20 uploaded (uml 32- and 64-bit defconfigs)

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Message-Id: <20140424081019.596b5d23c624f5721ba0480a@canb.auug.org.au>
Date:	Thu, 24 Apr 2014 08:10:19 +1000
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Luiz Capitulino <lcapitulino@...hat.com>,
	Randy Dunlap <rdunlap@...radead.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-next@...r.kernel.org, nacc@...ux.vnet.ibm.com,
	Richard Weinberger <richard@....at>
Subject: Re: mmotm 2014-04-22-15-20 uploaded (uml 32- and 64-bit defconfigs)

Hi all,

On Wed, 23 Apr 2014 11:24:42 -0700 Andrew Morton <akpm@...ux-foundation.org> wrote:
>
> I'll try moving hugepages_supported() into the #ifdef
> CONFIG_HUGETLB_PAGE section.
> 
> --- a/include/linux/hugetlb.h~hugetlb-ensure-hugepage-access-is-denied-if-hugepages-are-not-supported-fix-fix
> +++ a/include/linux/hugetlb.h
> @@ -412,6 +412,16 @@ static inline spinlock_t *huge_pte_lockp
>  	return &mm->page_table_lock;
>  }
>  
> +static inline bool hugepages_supported(void)
> +{
> +	/*
> +	 * Some platform decide whether they support huge pages at boot
> +	 * time. On these, such as powerpc, HPAGE_SHIFT is set to 0 when
> +	 * there is no such support
> +	 */
> +	return HPAGE_SHIFT != 0;
> +}
> +
>  #else	/* CONFIG_HUGETLB_PAGE */
>  struct hstate {};
>  #define alloc_huge_page_node(h, nid) NULL
> @@ -460,14 +470,4 @@ static inline spinlock_t *huge_pte_lock(
>  	return ptl;
>  }
>  
> -static inline bool hugepages_supported(void)
> -{
> -	/*
> -	 * Some platform decide whether they support huge pages at boot
> -	 * time. On these, such as powerpc, HPAGE_SHIFT is set to 0 when
> -	 * there is no such support
> -	 */
> -	return HPAGE_SHIFT != 0;
> -}
> -
>  #endif /* _LINUX_HUGETLB_H */

Clearly, noone reads my emails :-(

This is exactly what I reported and the fix I applied to yesterday's
linux-next ...

-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au

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