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| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2014-09-12 22:17:23 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2014-09-14 16:25:14 +0200 |
| commit | 0b70068e47e8f0c813a902dc3d6def601fd15acb (patch) | |
| tree | df0d682a73cad221961e96ee7a73f9c9d83bea66 /mm/memory.c | |
| parent | powerpc/kvm/cma: Fix panic introduces by signed shift operation (diff) | |
| download | linux-0b70068e47e8f0c813a902dc3d6def601fd15acb.tar.xz linux-0b70068e47e8f0c813a902dc3d6def601fd15acb.zip | |
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 <ard.biesheuvel@linaro.org>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'mm/memory.c')
| -rw-r--r-- | mm/memory.c | 2 |
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; +EXPORT_SYMBOL(zero_pfn); + /* * CONFIG_MMU architectures set up ZERO_PAGE in their paging_init() */ |