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Date: Fri, 18 Jan 2008 20:43:33 -0800 From: "Yinghai Lu" <yhlu.kernel@...il.com> To: "David Rientjes" <rientjes@...gle.com> Cc: travis@....com, "Andrew Morton" <akpm@...ux-foundation.org>, "Andi Kleen" <ak@...e.de>, mingo@...e.hu, "Christoph Lameter" <clameter@....com>, linux-mm@...ck.org, linux-kernel@...r.kernel.org, "Eric Dumazet" <dada1@...mosbay.com> Subject: Re: [PATCH 1/5] x86: Change size of node ids from u8 to u16 fixup On Jan 18, 2008 8:36 PM, David Rientjes <rientjes@...gle.com> wrote: > On Fri, 18 Jan 2008, Yinghai Lu wrote: > > > > +#if MAX_NUMNODES > 256 > > > +typedef u16 numanode_t; > > > +#else > > > +typedef u8 numanode_t; > > > +#endif > > > + > > > #endif /* _LINUX_NUMA_H */ > > > > that is wrong, you can not change pxm_to_node_map from int to u8 or u16. > > > > Yeah, NID_INVAL is negative so no unsigned type will work here, > unfortunately. And that reduces the intended savings of your change since > the smaller type can only be used with a smaller CONFIG_NODES_SHIFT. > > > int acpi_map_pxm_to_node(int pxm) > > { > > int node = pxm_to_node_map[pxm]; > > > > if (node < 0){ > > if (nodes_weight(nodes_found_map) >= MAX_NUMNODES) > > return NID_INVAL; > > node = first_unset_node(nodes_found_map); > > __acpi_map_pxm_to_node(pxm, node); > > node_set(node, nodes_found_map); > > } > > > > return node; > > } > > > > node will will be always 255 or 65535 > > > > Right. > > > please keep that to int. > > > > I got > > SART: PXM 0 -> APIC 0 -> Node 255 > > SART: PXM 0 -> APIC 1 -> Node 255 > > SART: PXM 1 -> APIC 2 -> Node 255 > > SART: PXM 1 -> APIC 3 -> Node 255 > > > > I assume this is a typo and those proximity mappings are actually from the > SRAT. SRAT for processor only have PXM and APIC id. setup_node(pxm) will get node id for pxm, start from 0... > > if (node < 0){ > > if (nodes_weight(nodes_found_map) >= MAX_NUMNODES) > > return NID_INVAL; > > node = first_unset_node(nodes_found_map); > > __acpi_map_pxm_to_node(pxm, node); > > node_set(node, nodes_found_map); > > } YH -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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