[PATCH 4/8] xen/x86: Fix section type mismatch in mm.c

[Andrew Cooper <andrew.cooper3@citrix.com>]

Clang doesn't like mixing const and non-const data in the same section.  Move
zero_page into .bss.page_aligned.const and wildcard .bss.page_aligned when
linking.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
---
CC: Jan Beulich <JBeulich@suse.com>
CC: George Dunlap <george.dunlap@eu.citrix.com>
---
 xen/arch/x86/mm.c      | 2 +-
 xen/arch/x86/xen.lds.S | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index d62d9ec..c214fc5 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -577,7 +577,7 @@ static inline void guest_get_eff_kern_l1e(struct vcpu *v, unsigned long addr,
     TOGGLE_MODE();
 }
 
-static const char __section(".bss.page_aligned") zero_page[PAGE_SIZE];
+static const char __section(".bss.page_aligned.const") zero_page[PAGE_SIZE];
 
 static void invalidate_shadow_ldt(struct vcpu *v, int flush)
 {
diff --git a/xen/arch/x86/xen.lds.S b/xen/arch/x86/xen.lds.S
index c1ce027..3b199ca 100644
--- a/xen/arch/x86/xen.lds.S
+++ b/xen/arch/x86/xen.lds.S
@@ -170,7 +170,7 @@ SECTIONS
        __bss_start = .;
        *(.bss.stack_aligned)
        . = ALIGN(PAGE_SIZE);
-       *(.bss.page_aligned)
+       *(.bss.page_aligned*)
        *(.bss)
        . = ALIGN(SMP_CACHE_BYTES);
        __per_cpu_start = .;
-- 
2.1.4