path: root/mm
diff options
authorArd Biesheuvel <>2014-09-12 22:17:23 +0200
committerPaolo Bonzini <>2014-09-14 16:25:14 +0200
commit0b70068e47e8f0c813a902dc3d6def601fd15acb (patch)
treedf0d682a73cad221961e96ee7a73f9c9d83bea66 /mm
parent02a68d0503fa470abff8852e10b1890df5730a08 (diff)
mm: export symbol dependencies of is_zero_pfn()
In order to make the static inline function is_zero_pfn() callable by modules, export its symbol dependencies 'zero_pfn' and (for s390 and mips) 'zero_page_mask'. We need this for KVM, as CONFIG_KVM is a tristate for all supported architectures except ARM and arm64, and testing a pfn whether it refers to the zero page is required to correctly distinguish the zero page from other special RAM ranges that may also have the PG_reserved bit set, but need to be treated as MMIO memory. Signed-off-by: Ard Biesheuvel <> Acked-by: Andrew Morton <> Signed-off-by: Paolo Bonzini <>
Diffstat (limited to 'mm')
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/memory.c b/mm/memory.c
index ab3537bcfed2..1fcf59a097b3 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -118,6 +118,8 @@ __setup("norandmaps", disable_randmaps);
unsigned long zero_pfn __read_mostly;
unsigned long highest_memmap_pfn __read_mostly;
* CONFIG_MMU architectures set up ZERO_PAGE in their paging_init()