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sparsemem: record when a section has a valid mem_map

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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.

[[email protected]: coding-syle fixes]
Signed-off-by: Andy Whitcroft <[email protected]>
Acked-by: Mel Gorman <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: "Luck, Tony" <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: KAMEZAWA Hiroyuki <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Andy Whitcroft 2007-10-16 01:24:11 -07:00 • committed by Linus Torvalds
commit 540557b943
3 changed files with 22 additions and 9 deletions
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6
drivers/base/memory.c
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@ -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)