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authorDave Hansen <haveblue@us.ibm.com>2005-06-23 00:07:38 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-23 09:45:00 -0700
commitc2ebaa425e6630adcbf757b004d257dd4204925b (patch)
tree9314642388bbe86020e58932cf6bb46be88deb4e /arch
parent408fde81c1bff15c875a3618481e93a01dcc79ea (diff)
downloadop-kernel-dev-c2ebaa425e6630adcbf757b004d257dd4204925b.zip
op-kernel-dev-c2ebaa425e6630adcbf757b004d257dd4204925b.tar.gz
[PATCH] sparsemem base: early_pfn_to_nid() (works before sparse is initialized)
The following four patches provide the last needed changes before the introduction of sparsemem. For a more complete description of what this will do, please see this patch: http://www.sr71.net/patches/2.6.11/2.6.11-bk7-mhp1/broken-out/B-sparse-150-sparsemem.patch or previous posts on the subject: http://marc.theaimsgroup.com/?t=110868540700001&r=1&w=2 http://marc.theaimsgroup.com/?l=linux-mm&m=109897373315016&w=2 Three of these are i386-only, but one of them reorganizes the macros used to manage the space in page->flags, and will affect all platforms. There are analogous patches to the i386 ones for ppc64, ia64, and x86_64, but those will be submitted by the normal arch maintainers. The combination of the four patches has been test-booted on a variety of i386 hardware, and compiled for ppc64, i386, and x86-64 with about 17 different .configs. It's also been runtime-tested on ia64 configs (with more patches on top). This patch: We _know_ which node pages in general belong to, at least at a very gross level in node_{start,end}_pfn[]. Use those to target the allocations of pages. Signed-off-by: Andy Whitcroft <apw@shadowen.org> Signed-off-by: Dave Hansen <haveblue@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/i386/mm/discontig.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/i386/mm/discontig.c b/arch/i386/mm/discontig.c
index 1726b40..85d2fcb 100644
--- a/arch/i386/mm/discontig.c
+++ b/arch/i386/mm/discontig.c
@@ -146,6 +146,21 @@ static void __init find_max_pfn_node(int nid)
BUG();
}
+/* Find the owning node for a pfn. */
+int early_pfn_to_nid(unsigned long pfn)
+{
+ int nid;
+
+ for_each_node(nid) {
+ if (node_end_pfn[nid] == 0)
+ break;
+ if (node_start_pfn[nid] <= pfn && node_end_pfn[nid] >= pfn)
+ return nid;
+ }
+
+ return 0;
+}
+
/*
* Allocate memory for the pg_data_t for this node via a crude pre-bootmem
* method. For node zero take this from the bottom of memory, for
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