Ravikiran G Thirumalai <[email protected]> wrote:
>
> While reserving KVA for lmem_maps of node, we have to make sure that
> node_remap_start_pfn[] is aligned to a proper pmd boundary.
> (node_remap_start_pfn[] gets its value from node_end_pfn[])
>
What are the effects of not having this patch applied? Does someone's
computer crash, or what?
IOW: what problem is this fixing, precisely?
>
> Index: linux-2.6.13-rc3/arch/i386/mm/discontig.c
> ===================================================================
> --- linux-2.6.13-rc3.orig/arch/i386/mm/discontig.c 2005-07-26 15:10:25.000000000 -0700
> +++ linux-2.6.13-rc3/arch/i386/mm/discontig.c 2005-07-26 16:27:43.000000000 -0700
> @@ -243,6 +243,14 @@
> /* now the roundup is correct, convert to PAGE_SIZE pages */
> size = size * PTRS_PER_PTE;
>
> + if (node_end_pfn[nid] & (PTRS_PER_PTE-1)) {
> + /*
> + * Adjust size if node_end_pfn is not on a proper
> + * pmd boundary. remap_numa_kva will barf otherwise.
> + */
> + size += node_end_pfn[nid] & (PTRS_PER_PTE-1);
> + }
> +
> /*
> * Validate the region we are allocating only contains valid
> * pages.
-
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