linux-kernel - Re: inux-next: Tree for Apr 27 (uml + mm/memcontrol.c)

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Message-ID: <4F9B3DBE.3020909@xenotime.net>
Date:	Fri, 27 Apr 2012 17:45:50 -0700
From:	Randy Dunlap <rdunlap@...otime.net>
To:	David Rientjes <rientjes@...gle.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Richard Weinberger <richard@....at>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: inux-next: Tree for Apr 27 (uml + mm/memcontrol.c)

On 04/27/2012 11:44 AM, David Rientjes wrote:

> On Fri, 27 Apr 2012, Randy Dunlap wrote:
> 
>> On 04/26/2012 11:11 PM, Stephen Rothwell wrote:
>>
>>> Hi all,
>>>
>>> Changes since 20120424:
>>
>>
>>
>> uml on x86_64 (defconfig):
>>
>> mm/memcontrol.c:256:30: error: 'HUGE_MAX_HSTATE' undeclared here (not in a function)
>>
> 
> This is because of "memcg: add HugeTLB extension" from -mm.
> 
> This patch is legal in C99, I wonder if Andrew would let us get away with 
> something like this so there's no a dozen #ifdefs in mm/memcontrol.c?


Well, that works, but no S-O-B and no Ack.


> ---
> diff --git a/arch/powerpc/include/asm/page.h b/arch/powerpc/include/asm/page.h
> --- a/arch/powerpc/include/asm/page.h
> +++ b/arch/powerpc/include/asm/page.h
> @@ -39,13 +39,13 @@
>  #ifndef __ASSEMBLY__
>  #ifdef CONFIG_HUGETLB_PAGE
>  extern unsigned int HPAGE_SHIFT;
> +#define HUGE_MAX_HSTATE		(MMU_PAGE_COUNT-1)
>  #else
>  #define HPAGE_SHIFT PAGE_SHIFT
>  #endif
>  #define HPAGE_SIZE		((1UL) << HPAGE_SHIFT)
>  #define HPAGE_MASK		(~(HPAGE_SIZE - 1))
>  #define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)
> -#define HUGE_MAX_HSTATE		(MMU_PAGE_COUNT-1)
>  #endif
>  
>  /* We do define AT_SYSINFO_EHDR but don't use the gate mechanism */
> diff --git a/arch/tile/include/asm/page.h b/arch/tile/include/asm/page.h
> --- a/arch/tile/include/asm/page.h
> +++ b/arch/tile/include/asm/page.h
> @@ -136,9 +136,8 @@ static inline __attribute_const__ int get_order(unsigned long size)
>  
>  #define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)
>  
> -#define HUGE_MAX_HSTATE		6
> -
>  #ifdef CONFIG_HUGETLB_PAGE
> +#define HUGE_MAX_HSTATE		6
>  #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
>  #endif
>  
> diff --git a/arch/x86/include/asm/page_types.h b/arch/x86/include/asm/page_types.h
> --- a/arch/x86/include/asm/page_types.h
> +++ b/arch/x86/include/asm/page_types.h
> @@ -25,7 +25,9 @@
>  #define HPAGE_MASK		(~(HPAGE_SIZE - 1))
>  #define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)
>  
> +#ifdef CONFIG_HUGETLB_PAGE
>  #define HUGE_MAX_HSTATE 2
> +#endif
>  
>  #define PAGE_OFFSET		((unsigned long)__PAGE_OFFSET)
>  
> diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
> --- a/include/linux/hugetlb.h
> +++ b/include/linux/hugetlb.h
> @@ -324,6 +324,7 @@ static inline int hstate_index(struct hstate *h)
>  
>  #else
>  struct hstate {};
> +#define HUGE_MAX_HSTATE 0
>  #define alloc_huge_page_node(h, nid) NULL
>  #define alloc_bootmem_huge_page(h) NULL
>  #define hstate_file(f) NULL



-- 
~Randy
--
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