path: root/mm/internal.h
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authorMel Gorman <mel@csn.ul.ie>2008-07-23 21:26:52 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-24 10:47:13 -0700
commit2dbb51c49f4fecb8330e43247a0edfbc4b2b8974 (patch)
tree507f06335dd1e66144f176e8e863743895e43d79 /mm/internal.h
parent708614e6180f398cd307ea0048d48ba6fa274610 (diff)
mm: make defensive checks around PFN values registered for memory usage
There are a number of different views to how much memory is currently active. There is the arch-independent zone-sizing view, the bootmem allocator and memory models view. Architectures register this information at different times and is not necessarily in sync particularly with respect to some SPARSEMEM limitations. This patch introduces mminit_validate_memmodel_limits() which is able to validate and correct PFN ranges with respect to the memory model. It is only SPARSEMEM that currently validates itself. Signed-off-by: Mel Gorman <mel@csn.ul.ie> Cc: Christoph Lameter <cl@linux-foundation.org> Cc: Andy Whitcroft <apw@shadowen.org> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/internal.h')
1 files changed, 12 insertions, 0 deletions
diff --git a/mm/internal.h b/mm/internal.h
index 7a4a2885dc8..5d17f3efac4 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -98,4 +98,16 @@ static inline void mminit_verify_page_links(struct page *page,
+/* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
+#if defined(CONFIG_SPARSEMEM)
+extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,
+ unsigned long *end_pfn);
+static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
+ unsigned long *end_pfn)
+#endif /* CONFIG_SPARSEMEM */