[PATCH] ext4: Export needed symbol for ZERO_PAGE usage in modules.

["Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>]

ext4 use ZERO_PAGE(0) to zero out blocks. We need to export
different symbols in different arch for the usage of ZERO_PAGE
in modules.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
 arch/arm/mm/mmu.c               |    1 +
 arch/m68k/mm/init.c             |    1 +
 arch/powerpc/kernel/ppc_ksyms.c |    2 ++
 arch/sparc/kernel/sparc_ksyms.c |    2 ++
 arch/sparc64/mm/init.c          |    1 +
 5 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index d41a75e..2d6d682 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -35,6 +35,7 @@ extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
  * zero-initialized data and COW.
  */
 struct page *empty_zero_page;
+EXPORT_SYMBOL(empty_zero_page);
 
 /*
  * The pmd table for the upper-most set of pages.
diff --git a/arch/m68k/mm/init.c b/arch/m68k/mm/init.c
index f42caa7..ee27ed2 100644
--- a/arch/m68k/mm/init.c
+++ b/arch/m68k/mm/init.c
@@ -69,6 +69,7 @@ void __init m68k_setup_node(int node)
  */
 
 void *empty_zero_page;
+EXPORT_SYMBOL(empty_zero_page);
 
 void show_mem(void)
 {
diff --git a/arch/powerpc/kernel/ppc_ksyms.c b/arch/powerpc/kernel/ppc_ksyms.c
index aa9ff35..97dab6e 100644
--- a/arch/powerpc/kernel/ppc_ksyms.c
+++ b/arch/powerpc/kernel/ppc_ksyms.c
@@ -189,3 +189,5 @@ EXPORT_SYMBOL(intercept_table);
 EXPORT_SYMBOL(__mtdcr);
 EXPORT_SYMBOL(__mfdcr);
 #endif
+
+EXPORT_SYMBOL(empty_zero_page);
diff --git a/arch/sparc/kernel/sparc_ksyms.c b/arch/sparc/kernel/sparc_ksyms.c
index c1025e5..e902846 100644
--- a/arch/sparc/kernel/sparc_ksyms.c
+++ b/arch/sparc/kernel/sparc_ksyms.c
@@ -295,3 +295,5 @@ EXPORT_SYMBOL(do_BUG);
 
 /* Sun Power Management Idle Handler */
 EXPORT_SYMBOL(pm_idle);
+
+EXPORT_SYMBOL(empty_zero_page);
diff --git a/arch/sparc64/mm/init.c b/arch/sparc64/mm/init.c
index b5c3041..2d15f92 100644
--- a/arch/sparc64/mm/init.c
+++ b/arch/sparc64/mm/init.c
@@ -159,6 +159,7 @@ extern unsigned int sparc_ramdisk_image;
 extern unsigned int sparc_ramdisk_size;
 
 struct page *mem_map_zero __read_mostly;
+EXPORT_SYMBOL(mem_map_zero);
 
 unsigned int sparc64_highest_unlocked_tlb_ent __read_mostly;
 
-- 
1.5.4.4.481.g5075.dirty