Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=3af044e0f832cfa3fcdce14dc30678b79dd36995
Commit: 3af044e0f832cfa3fcdce14dc30678b79dd36995
Parent: 34feb2c83beb3bdf13535a36770f7e50b47ef299
Author: David Rientjes <[EMAIL PROTECTED]>
AuthorDate: Sat Jul 21 17:10:31 2007 +0200
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Sat Jul 21 18:37:10 2007 -0700
x86_64: extract helper function from e820_register_active_regions
The logic in e820_find_active_regions() for determining the true active
regions for an e820 entry given a range of PFN's is needed for
e820_hole_size() as well.
e820_hole_size() is called from the NUMA emulation code to determine the
reserved area within an address range on a per-node basis. Its logic should
duplicate that of finding active regions in an e820 entry because these are
the only true ranges we may register anyway.
[EMAIL PROTECTED]: cleanup]
Cc: Mel Gorman <[EMAIL PROTECTED]>
Signed-off-by: David Rientjes <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Andi Kleen <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
arch/x86_64/kernel/e820.c | 82 ++++++++++++++++++++++++++------------------
1 files changed, 48 insertions(+), 34 deletions(-)
diff --git a/arch/x86_64/kernel/e820.c b/arch/x86_64/kernel/e820.c
index 13c6c37..2570643 100644
--- a/arch/x86_64/kernel/e820.c
+++ b/arch/x86_64/kernel/e820.c
@@ -289,47 +289,61 @@ void __init e820_mark_nosave_regions(void)
}
}
-/* Walk the e820 map and register active regions within a node */
-void __init
-e820_register_active_regions(int nid, unsigned long start_pfn,
- unsigned long end_pfn)
+/*
+ * Finds an active region in the address range from start_pfn to end_pfn and
+ * returns its range in ei_startpfn and ei_endpfn for the e820 entry.
+ */
+static int __init e820_find_active_region(const struct e820entry *ei,
+ unsigned long start_pfn,
+ unsigned long end_pfn,
+ unsigned long *ei_startpfn,
+ unsigned long *ei_endpfn)
{
- int i;
- unsigned long ei_startpfn, ei_endpfn;
- for (i = 0; i < e820.nr_map; i++) {
- struct e820entry *ei = &e820.map[i];
- ei_startpfn = round_up(ei->addr, PAGE_SIZE) >> PAGE_SHIFT;
- ei_endpfn = round_down(ei->addr + ei->size, PAGE_SIZE)
- >> PAGE_SHIFT;
+ *ei_startpfn = round_up(ei->addr, PAGE_SIZE) >> PAGE_SHIFT;
+ *ei_endpfn = round_down(ei->addr + ei->size, PAGE_SIZE) >> PAGE_SHIFT;
- /* Skip map entries smaller than a page */
- if (ei_startpfn >= ei_endpfn)
- continue;
+ /* Skip map entries smaller than a page */
+ if (*ei_startpfn >= *ei_endpfn)
+ return 0;
- /* Check if end_pfn_map should be updated */
- if (ei->type != E820_RAM && ei_endpfn > end_pfn_map)
- end_pfn_map = ei_endpfn;
+ /* Check if end_pfn_map should be updated */
+ if (ei->type != E820_RAM && *ei_endpfn > end_pfn_map)
+ end_pfn_map = *ei_endpfn;
- /* Skip if map is outside the node */
- if (ei->type != E820_RAM ||
- ei_endpfn <= start_pfn ||
- ei_startpfn >= end_pfn)
- continue;
+ /* Skip if map is outside the node */
+ if (ei->type != E820_RAM || *ei_endpfn <= start_pfn ||
+ *ei_startpfn >= end_pfn)
+ return 0;
- /* Check for overlaps */
- if (ei_startpfn < start_pfn)
- ei_startpfn = start_pfn;
- if (ei_endpfn > end_pfn)
- ei_endpfn = end_pfn;
+ /* Check for overlaps */
+ if (*ei_startpfn < start_pfn)
+ *ei_startpfn = start_pfn;
+ if (*ei_endpfn > end_pfn)
+ *ei_endpfn = end_pfn;
- /* Obey end_user_pfn to save on memmap */
- if (ei_startpfn >= end_user_pfn)
- continue;
- if (ei_endpfn > end_user_pfn)
- ei_endpfn = end_user_pfn;
+ /* Obey end_user_pfn to save on memmap */
+ if (*ei_startpfn >= end_user_pfn)
+ return 0;
+ if (*ei_endpfn > end_user_pfn)
+ *ei_endpfn = end_user_pfn;
- add_active_range(nid, ei_startpfn, ei_endpfn);
- }
+ return 1;
+}
+
+/* Walk the e820 map and register active regions within a node */
+void __init
+e820_register_active_regions(int nid, unsigned long start_pfn,
+ unsigned long end_pfn)
+{
+ unsigned long ei_startpfn;
+ unsigned long ei_endpfn;
+ int i;
+
+ for (i = 0; i < e820.nr_map; i++)
+ if (e820_find_active_region(&e820.map[i],
+ start_pfn, end_pfn,
+ &ei_startpfn, &ei_endpfn))
+ add_active_range(nid, ei_startpfn, ei_endpfn);
}
/*
-
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