[xen master] xen/arm: mm: add missing extern variable declaration

[patchbot@xxxxxxx]

commit 24908ef3345f55b45004671e0f24ada8810f9c97
Author:     Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
AuthorDate: Thu Aug 10 15:15:50 2023 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Aug 10 15:15:50 2023 +0200

    xen/arm: mm: add missing extern variable declaration
    
    Add a declaration for the variable 'init_ttbr' to resolve the violation
    of MISRA C:2012 Rule 8.4 present the relative source file 'mm.c'.
    
    No functional changes.
    
    Fixes: 4557c2292854 ("xen: arm: rewrite start of day page table and cpu 
bring up")
    Signed-off-by: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
    Reviewed-by: Luca Fancellu <luca.fancellu@xxxxxxx>
    Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
---
 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 2db8535a4c..aaacba3f04 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
--
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