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| author | Andy Whitcroft <apw@shadowen.org> | 2007-10-16 12:24:11 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-16 20:42:51 +0400 |
| commit | 540557b9439ec19668553830c90222f9fb0c2e95 (patch) | |
| tree | 07dfa0e88580d4101dbb11ebc59348233e18b2f0 /mm/sparse.c | |
| parent | cd881a6b22902b356cacf8fd2e4e895871068eec (diff) | |
| download | linux-540557b9439ec19668553830c90222f9fb0c2e95.tar.xz | |
sparsemem: record when a section has a valid mem_map
We have flags to indicate whether a section actually has a valid mem_map
associated with it. This is never set and we rely solely on the present bit
to indicate a section is valid. By definition a section is not valid if it
has no mem_map and there is a window during init where the present bit is set
but there is no mem_map, during which pfn_valid() will return true
incorrectly.
Use the existing SECTION_HAS_MEM_MAP flag to indicate the presence of a valid
mem_map. Switch valid_section{,_nr} and pfn_valid() to this bit. Add a new
present_section{,_nr} and pfn_present() interfaces for those users who care to
know that a section is going to be valid.
[akpm@linux-foundation.org: coding-syle fixes]
Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Cc: Christoph Lameter <clameter@sgi.com>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Andi Kleen <ak@suse.de>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/sparse.c')
| -rw-r--r-- | mm/sparse.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/mm/sparse.c b/mm/sparse.c index e8f36e4796d0..54f3940406cb 100644 --- a/mm/sparse.c +++ b/mm/sparse.c @@ -176,7 +176,7 @@ unsigned long __init node_memmap_size_bytes(int nid, unsigned long start_pfn, if (nid != early_pfn_to_nid(pfn)) continue; - if (pfn_valid(pfn)) + if (pfn_present(pfn)) nr_pages += PAGES_PER_SECTION; } @@ -206,11 +206,12 @@ struct page *sparse_decode_mem_map(unsigned long coded_mem_map, unsigned long pn static int __meminit sparse_init_one_section(struct mem_section *ms, unsigned long pnum, struct page *mem_map) { - if (!valid_section(ms)) + if (!present_section(ms)) return -EINVAL; ms->section_mem_map &= ~SECTION_MAP_MASK; - ms->section_mem_map |= sparse_encode_mem_map(mem_map, pnum); + ms->section_mem_map |= sparse_encode_mem_map(mem_map, pnum) | + SECTION_HAS_MEM_MAP; return 1; } @@ -256,7 +257,7 @@ void __init sparse_init(void) struct page *map; for (pnum = 0; pnum < NR_MEM_SECTIONS; pnum++) { - if (!valid_section_nr(pnum)) + if (!present_section_nr(pnum)) continue; map = sparse_early_mem_map_alloc(pnum); |