On Thu, 17 Jan 2013 14:52:52 -0800
Cody P Schafer <cody@xxxxxxxxxxxxxxxxxx> wrote:
Summaries:
1 - avoid repeating checks for section in page flags by adding a define.
2 - add & switch to zone_end_pfn() and zone_spans_pfn()
3 - adds zone_is_initialized() & zone_is_empty()
4 - adds a VM_BUG using zone_is_initialized() in __free_one_page()
5 - add pgdat_end_pfn() and pgdat_is_empty()
6 - add debugging message to VM_BUG check.
7 - add ensure_zone_is_initialized() (for memory_hotplug)
8 - use the above addition in memory_hotplug
9 - use pgdat_end_pfn()
Well that's a nice little patchset.
Some of the patches were marked From:cody@xxxxxxxxxxxxxxxxxx and others
were From:jmesmon@xxxxxxxxxx This is strange. If you want me to fix
that up, please let me know which is preferred.
As a general concern: spanned_pages & start_pfn (in pgdat & zone) are supposed
to be locked (via a seqlock) when read (due to changes to them via
memory_hotplug), but very few (only 1?) of their users appear to actually lock
them.
OK, thanks. Perhaps this is something which the memory-hotplug
developers could take a look at?