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| author | Andy Whitcroft <apw@shadowen.org> | 2007-10-16 01:24:11 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-16 09:42:51 -0700 |
| commit | 540557b9439ec19668553830c90222f9fb0c2e95 (patch) | |
| tree | 07dfa0e88580d4101dbb11ebc59348233e18b2f0 /drivers/base/memory.c | |
| parent | cd881a6b22902b356cacf8fd2e4e895871068eec (diff) | |
| download | kernel-common-540557b9439ec19668553830c90222f9fb0c2e95.tar.gz kernel-common-540557b9439ec19668553830c90222f9fb0c2e95.tar.bz2 kernel-common-540557b9439ec19668553830c90222f9fb0c2e95.zip | |
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 'drivers/base/memory.c')
| -rw-r--r-- | drivers/base/memory.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/base/memory.c b/drivers/base/memory.c index 7a1390cd6aad..c41d0728efe2 100644 --- a/drivers/base/memory.c +++ b/drivers/base/memory.c @@ -238,7 +238,7 @@ store_mem_state(struct sys_device *dev, const char *buf, size_t count) mem = container_of(dev, struct memory_block, sysdev); phys_section_nr = mem->phys_index; - if (!valid_section_nr(phys_section_nr)) + if (!present_section_nr(phys_section_nr)) goto out; if (!strncmp(buf, "online", min((int)count, 6))) @@ -418,7 +418,7 @@ int register_new_memory(struct mem_section *section) int unregister_memory_section(struct mem_section *section) { - if (!valid_section(section)) + if (!present_section(section)) return -EINVAL; return remove_memory_block(0, section, 0); @@ -443,7 +443,7 @@ int __init memory_dev_init(void) * during boot and have been initialized */ for (i = 0; i < NR_MEM_SECTIONS; i++) { - if (!valid_section_nr(i)) + if (!present_section_nr(i)) continue; err = add_memory_block(0, __nr_to_section(i), MEM_ONLINE, 0); if (!ret) |