From 0b70068e47e8f0c813a902dc3d6def601fd15acb Mon Sep 17 00:00:00 2001 From: Ard Biesheuvel Date: Fri, 12 Sep 2014 22:17:23 +0200 Subject: [PATCH] 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 --- arch/mips/mm/init.c | 1 + arch/s390/mm/init.c | 1 + mm/memory.c | 2 ++ 3 files changed, 4 insertions(+) diff --git a/arch/mips/mm/init.c b/arch/mips/mm/init.c index 571aab064936..f42e35e42790 100644 --- a/arch/mips/mm/init.c +++ b/arch/mips/mm/init.c @@ -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 diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c index 0c1073ed1e84..c7235e01fd67 100644 --- a/arch/s390/mm/init.c +++ b/arch/s390/mm/init.c @@ -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) { 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() */ -- GitLab