linux-ext4 - Re: [PATCH] arm: Export needed symbol for ZERO

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Message-Id: <20080324120541.04615a2b.akpm@linux-foundation.org>
Date:	Mon, 24 Mar 2008 12:05:41 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	cmm@...ibm.com, rmk@....linux.org.uk, linux-ext4@...r.kernel.org,
	aneesh.kumar@...ux.vnet.ibm.com
Subject: Re: [PATCH] arm: Export needed symbol for ZERO_PAGE usage in
 modules.

On Mon, 24 Mar 2008 23:31:29 +0530
"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com> wrote:

> ext4 use ZERO_PAGE(0) to zero out blocks. We need to export
> different symbols in different arch for the usage of ZERO_PAGE
> in modules.
> 
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
> ---
>  arch/arm/mm/mmu.c |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
> index d41a75e..2d6d682 100644
> --- a/arch/arm/mm/mmu.c
> +++ b/arch/arm/mm/mmu.c
> @@ -35,6 +35,7 @@ extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
>   * zero-initialized data and COW.
>   */
>  struct page *empty_zero_page;
> +EXPORT_SYMBOL(empty_zero_page);
>  
>  /*

I wonder if it would be better to do this export in generic code.

Architectures which don't implement empty_zero_page:

alpha:		seems to do something fancy
sparc64: 	need to rename mem_map_zero to empty_zero_page
v850:		#define ZERO_PAGE(vaddr) ((void *)0x87654321)  (wtf?)


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