[PATCH v2 1/6] xen/arm: address violations of MISRA C:2012 Rule 11.8

[Simone Ballarin <simone.ballarin@xxxxxxxxxxx>]

From: Maria Celeste Cesario <maria.celeste.cesario@xxxxxxxxxxx>

The xen sources contain violations of MISRA C:2012 Rule 11.8 whose
headline states:
"A conversion shall not remove any const, volatile or _Atomic qualification
from the type pointed to by a pointer".

Add missing const qualifiers in casts.
The variables are originally const-qualified.
There's no reason to drop the qualifiers.

Drop redundant cast to preserve const qualifier.

No functional change.

Signed-off-by: Maria Celeste Cesario  <maria.celeste.cesario@xxxxxxxxxxx>
Signed-off-by: Simone Ballarin  <simone.ballarin@xxxxxxxxxxx>
---
Changes in v2:
- drop redundant cast on fdt
---
 xen/arch/arm/bootfdt.c                 | 6 +++---
 xen/arch/arm/include/asm/alternative.h | 2 +-
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/xen/arch/arm/bootfdt.c b/xen/arch/arm/bootfdt.c
index f496a8cf94..1cbac3cb2a 100644
--- a/xen/arch/arm/bootfdt.c
+++ b/xen/arch/arm/bootfdt.c
@@ -377,7 +377,7 @@ static int __init process_chosen_node(const void *fdt, int 
node,
         printk("linux,initrd-start property has invalid length %d\n", len);
         return -EINVAL;
     }
-    start = dt_read_paddr((void *)&prop->data, dt_size_to_cells(len));
+    start = dt_read_paddr((const void *)&prop->data, dt_size_to_cells(len));
 
     prop = fdt_get_property(fdt, node, "linux,initrd-end", &len);
     if ( !prop )
@@ -390,7 +390,7 @@ static int __init process_chosen_node(const void *fdt, int 
node,
         printk("linux,initrd-end property has invalid length %d\n", len);
         return -EINVAL;
     }
-    end = dt_read_paddr((void *)&prop->data, dt_size_to_cells(len));
+    end = dt_read_paddr((const void *)&prop->data, dt_size_to_cells(len));
 
     if ( start >= end )
     {
@@ -541,7 +541,7 @@ size_t __init boot_fdt_info(const void *fdt, paddr_t paddr)
 
     add_boot_module(BOOTMOD_FDT, paddr, fdt_totalsize(fdt), false);
 
-    ret = device_tree_for_each_node((void *)fdt, 0, early_scan_node, NULL);
+    ret = device_tree_for_each_node(fdt, 0, early_scan_node, NULL);
     if ( ret )
         panic("Early FDT parsing failed (%d)\n", ret);
 
diff --git a/xen/arch/arm/include/asm/alternative.h 
b/xen/arch/arm/include/asm/alternative.h
index d3210e82f9..c7632668b6 100644
--- a/xen/arch/arm/include/asm/alternative.h
+++ b/xen/arch/arm/include/asm/alternative.h
@@ -20,7 +20,7 @@ struct alt_instr {
 };
 
 /* Xen: helpers used by common code. */
-#define __ALT_PTR(a,f)         ((void *)&(a)->f + (a)->f)
+#define __ALT_PTR(a,f)         ((const void *)&(a)->f + (a)->f)
 #define ALT_ORIG_PTR(a)                __ALT_PTR(a, orig_offset)
 #define ALT_REPL_PTR(a)                __ALT_PTR(a, repl_offset)
 
-- 
2.40.0