Commit a539f353 authored May 24, 2011 by Daniel Kiper Committed by Linus Torvalds May 25, 2011

mm: add SECTION_ALIGN_UP() and SECTION_ALIGN_DOWN() macro



Add SECTION_ALIGN_UP() and SECTION_ALIGN_DOWN() macro which aligns given
pfn to upper section and lower section boundary accordingly.

Required for the latest memory hotplug support for the Xen balloon driver.

Signed-off-by: Daniel Kiper <dkiper@net-space.pl>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent a2c8990a

include/linux/mmzone.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -956,6 +956,9 @@ static inline unsigned long early_pfn_to_nid(unsigned long pfn)
		#define pfn_to_section_nr(pfn) ((pfn) >> PFN_SECTION_SHIFT)
		#define section_nr_to_pfn(sec) ((sec) << PFN_SECTION_SHIFT)

		#define SECTION_ALIGN_UP(pfn) (((pfn) + PAGES_PER_SECTION - 1) & PAGE_SECTION_MASK)
		#define SECTION_ALIGN_DOWN(pfn) ((pfn) & PAGE_SECTION_MASK)

		struct page;
		struct page_cgroup;
		struct mem_section {