From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Fri, 18 Jan 2008 20:36:58 -0800 (PST) From: David Rientjes Subject: Re: [PATCH 1/5] x86: Change size of node ids from u8 to u16 fixup In-Reply-To: <86802c440801182003vd94044ex7fb13e61e5f79c81@mail.gmail.com> Message-ID: References: <20080118183011.354965000@sgi.com> <20080118183011.527888000@sgi.com> <86802c440801182003vd94044ex7fb13e61e5f79c81@mail.gmail.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: Yinghai Lu Cc: travis@sgi.com, Andrew Morton , Andi Kleen , mingo@elte.hu, Christoph Lameter , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Eric Dumazet List-ID: 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. David -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org