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authorDaniel Kiper <dkiper@net-space.pl>2011-05-24 17:12:51 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-05-25 08:39:36 -0700
commita539f3533b78e39a22723d6d3e1e11b6c14454d9 (patch)
tree59c62d883a2f38e79a5e37d114c4560443728426
parenta2c8990aed5ab000491732b07c8c4465d1b389b8 (diff)
downloadop-kernel-dev-a539f3533b78e39a22723d6d3e1e11b6c14454d9.zip
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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>
-rw-r--r--include/linux/mmzone.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index d715200..217bcf6 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -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 {
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