Re: [PATCH 1/4] Memory Add Fixes for ppc64

[Benjamin Herrenschmidt <benh@kernel.crashing.org>]

On Fri, 2005-11-04 at 15:18 -0800, Mike Kravetz wrote:
> Add the create_section_mapping() routine to create hptes for memory
> sections dynamically added after system boot.
> 
> Signed-off-by: Mike Kravetz <kravetz@us.ibm.com>

This patch will have to be slightly reworked on top of the 64k pages
one. It should be trivial though.

Ben.

> diff -Naupr linux-2.6.14-git7/arch/powerpc/mm/hash_utils_64.c linux-2.6.14-git7.work/arch/powerpc/mm/hash_utils_64.c
> --- linux-2.6.14-git7/arch/powerpc/mm/hash_utils_64.c	2005-11-04 21:21:05.000000000 +0000
> +++ linux-2.6.14-git7.work/arch/powerpc/mm/hash_utils_64.c	2005-11-04 22:05:06.000000000 +0000
> @@ -176,6 +176,15 @@ static unsigned long get_hashtable_size(
>  	return pteg_count << 7;
>  }
>  
> +#ifdef CONFIG_MEMORY_HOTPLUG
> +void create_section_mapping(unsigned long start, unsigned long end)
> +{
> +	create_pte_mapping(start, end,
> +		_PAGE_ACCESSED | _PAGE_COHERENT | PP_RWXX,
> +		cur_cpu_spec->cpu_features & CPU_FTR_16M_PAGE ? 1 : 0);
> +}
> +#endif /* CONFIG_MEMORY_HOTPLUG */
> +
>  void __init htab_initialize(void)
>  {
>  	unsigned long table, htab_size_bytes;
> diff -Naupr linux-2.6.14-git7/arch/powerpc/mm/mem.c linux-2.6.14-git7.work/arch/powerpc/mm/mem.c
> --- linux-2.6.14-git7/arch/powerpc/mm/mem.c	2005-11-04 21:21:05.000000000 +0000
> +++ linux-2.6.14-git7.work/arch/powerpc/mm/mem.c	2005-11-04 22:05:06.000000000 +0000
> @@ -124,6 +124,9 @@ int __devinit add_memory(u64 start, u64 
>  	unsigned long start_pfn = start >> PAGE_SHIFT;
>  	unsigned long nr_pages = size >> PAGE_SHIFT;
>  
> +	start += KERNELBASE;
> +	create_section_mapping(start, start + size);
> +
>  	/* this should work for most non-highmem platforms */
>  	zone = pgdata->node_zones;
>  
> diff -Naupr linux-2.6.14-git7/include/asm-ppc64/sparsemem.h linux-2.6.14-git7.work/include/asm-ppc64/sparsemem.h
> --- linux-2.6.14-git7/include/asm-ppc64/sparsemem.h	2005-10-28 00:02:08.000000000 +0000
> +++ linux-2.6.14-git7.work/include/asm-ppc64/sparsemem.h	2005-11-04 22:05:06.000000000 +0000
> @@ -11,6 +11,10 @@
>  #define MAX_PHYSADDR_BITS       38
>  #define MAX_PHYSMEM_BITS        36
>  
> +#ifdef CONFIG_MEMORY_HOTPLUG
> +extern void create_section_mapping(unsigned long start, unsigned long end);
> +#endif /* CONFIG_MEMORY_HOTPLUG */
> +
>  #endif /* CONFIG_SPARSEMEM */
>  
>  #endif /* _ASM_PPC64_SPARSEMEM_H */
> -
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