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Commit 0b70068e authored by Ard Biesheuvel's avatar Ard Biesheuvel Committed by Paolo Bonzini
Browse files

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: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 02a68d05

arch/mips/mm/init.c

+1 −0
Original line number Diff line number Diff line
@@ -53,6 +53,7 @@ 
 */

unsigned long empty_zero_page, zero_page_mask;

EXPORT_SYMBOL_GPL(empty_zero_page);

EXPORT_SYMBOL(zero_page_mask);



/*

 * Not static inline because used by IP27 special magic initialization code

arch/s390/mm/init.c

+1 −0
Original line number Diff line number Diff line
@@ -43,6 +43,7 @@ pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE))); 


unsigned long empty_zero_page, zero_page_mask;

EXPORT_SYMBOL(empty_zero_page);

EXPORT_SYMBOL(zero_page_mask);



static void __init setup_zero_pages(void)

{

mm/memory.c

+2 −0
Original line number Diff line number Diff line
@@ -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()

 */