path: root/mm/sparse-vmemmap.c
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authorAndy Whitcroft <>2007-10-16 01:24:11 -0700
committerLinus Torvalds <>2007-10-16 09:42:51 -0700
commit540557b9439ec19668553830c90222f9fb0c2e95 (patch)
tree07dfa0e88580d4101dbb11ebc59348233e18b2f0 /mm/sparse-vmemmap.c
parentcd881a6b22902b356cacf8fd2e4e895871068eec (diff)
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. [ coding-syle fixes] Signed-off-by: Andy Whitcroft <> Acked-by: Mel Gorman <> Cc: Christoph Lameter <> Cc: "Luck, Tony" <> Cc: Andi Kleen <> Cc: "David S. Miller" <> Cc: Paul Mackerras <> Cc: Benjamin Herrenschmidt <> Cc: KAMEZAWA Hiroyuki <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
Diffstat (limited to 'mm/sparse-vmemmap.c')
0 files changed, 0 insertions, 0 deletions