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| author | David S. Miller <davem@davemloft.net> | 2008-04-17 23:56:30 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-04-17 23:56:30 -0700 |
| commit | 1e42198609d73ed1a9adcba2af275c24c2678420 (patch) | |
| tree | 32fd4d9073bfc0f3909af8f9fb4bcff38951d01a /mm/sparse.c | |
| parent | 794eb6bf20ebf992c040ea831cd3a9c64b0c1f7a (diff) | |
| parent | 4b119e21d0c66c22e8ca03df05d9de623d0eb50f (diff) | |
| download | lwn-1e42198609d73ed1a9adcba2af275c24c2678420.tar.gz lwn-1e42198609d73ed1a9adcba2af275c24c2678420.zip | |
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6
Diffstat (limited to 'mm/sparse.c')
| -rw-r--r-- | mm/sparse.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/mm/sparse.c b/mm/sparse.c index f6a43c09c322..98d6b39c3472 100644 --- a/mm/sparse.c +++ b/mm/sparse.c @@ -149,8 +149,18 @@ static inline int sparse_early_nid(struct mem_section *section) /* Record a memory area against a node. */ void __init memory_present(int nid, unsigned long start, unsigned long end) { + unsigned long max_arch_pfn = 1UL << (MAX_PHYSMEM_BITS-PAGE_SHIFT); unsigned long pfn; + /* + * Sanity checks - do not allow an architecture to pass + * in larger pfns than the maximum scope of sparsemem: + */ + if (start >= max_arch_pfn) + return; + if (end >= max_arch_pfn) + end = max_arch_pfn; + start &= PAGE_SECTION_MASK; for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) { unsigned long section = pfn_to_section_nr(pfn); |