[PATCH 5/6] arm/platforms: Make compatbile with -Wwrite-strings

[Andrew Cooper]

GCC complains:

  arch/arm/platforms/brcm.c: In function ‘brcm_populate_plat_regs’:
  arch/arm/platforms/brcm.c:76:27: error: passing argument 1 of 
‘brcm_get_dt_node’ discards ‘const’ qualifier from pointer target type 
[-Werror=discarded-qualifiers]
     76 |     rc = brcm_get_dt_node("brcm,brcmstb-cpu-biu-ctrl", &node, 
&reg_base);
        |                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~

and

  arch/arm/platforms/exynos5.c: In function ‘exynos5_smp_init’:
  arch/arm/platforms/exynos5.c:109:20: error: assignment discards ‘const’ 
qualifier from pointer target type [-Werror=discarded-qualifiers]
    109 |         compatible = "samsung,exynos4210-sysram-ns";
        |                    ^

In both cases, just make the relevant variable const.

Signed-off-by: Andrew Cooper <andrew.coop...@citrix.com>
---
CC: Stefano Stabellini <sstabell...@kernel.org>
CC: Julien Grall <jul...@xen.org>
CC: Volodymyr Babchuk <volodymyr_babc...@epam.com>
CC: Bertrand Marquis <bertrand.marq...@arm.com>
CC: Michal Orzel <michal.or...@amd.com>
CC: Roberto Bagnara <roberto.bagn...@bugseng.com>
CC: Nicola Vetrini <nicola.vetr...@bugseng.com>
---
 xen/arch/arm/platforms/brcm.c    | 2 +-
 xen/arch/arm/platforms/exynos5.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/xen/arch/arm/platforms/brcm.c b/xen/arch/arm/platforms/brcm.c
index 951e4d6cc328..43a07ab1a69d 100644
--- a/xen/arch/arm/platforms/brcm.c
+++ b/xen/arch/arm/platforms/brcm.c
@@ -35,7 +35,7 @@ static u32 brcm_boot_continuation_pc;
 
 static struct brcm_plat_regs regs;
 
-static __init int brcm_get_dt_node(char *compat_str,
+static __init int brcm_get_dt_node(const char *compat_str,
                                    const struct dt_device_node **dn,
                                    u32 *reg_base)
 {
diff --git a/xen/arch/arm/platforms/exynos5.c b/xen/arch/arm/platforms/exynos5.c
index c48093cd4fa4..f7c09520675e 100644
--- a/xen/arch/arm/platforms/exynos5.c
+++ b/xen/arch/arm/platforms/exynos5.c
@@ -96,7 +96,7 @@ static int __init exynos5_smp_init(void)
 {
     struct dt_device_node *node;
     void __iomem *sysram;
-    char *compatible;
+    const char *compatible;
     paddr_t sysram_addr;
     paddr_t size;
     paddr_t sysram_offset;
-- 
2.30.2