[XEN PATCH v2 6/7] xen/arm: mm: add missing extern variable declaration

[Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>]

Add a declaration for the variable 'init_ttbr' to resolve
the violation of Rule 8.4 present the relative source file 'mm.c'.

No functional changes.

Signed-off-by: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
Fixes: 4557c2292854 ("xen: arm: rewrite start of day page table and cpu bring 
up")
Reviewed-by: Luca Fancellu <luca.fancellu@xxxxxxx>
Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
---
Changes in v2:
- Revised commit message
---
 xen/arch/arm/include/asm/mm.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/xen/arch/arm/include/asm/mm.h b/xen/arch/arm/include/asm/mm.h
index 2db8535a4ca8..aaacba3f044b 100644
--- a/xen/arch/arm/include/asm/mm.h
+++ b/xen/arch/arm/include/asm/mm.h
@@ -165,6 +165,9 @@ struct page_info
 #define _PGC_need_scrub   _PGC_allocated
 #define PGC_need_scrub    PGC_allocated
 
+/* Non-boot CPUs use this to find the correct pagetables. */
+extern uint64_t init_ttbr;
+
 extern mfn_t directmap_mfn_start, directmap_mfn_end;
 extern vaddr_t directmap_virt_end;
 #ifdef CONFIG_ARM_64
-- 
2.34.1