[POWERPC] Split initrd logic out of early_init_dt_scan_chosen() to fix warning

If CONFIG_BLK_DEV_INITRD is not defined the prop variable in
early_init_dt_scan_chosen() is unused, causing a compiler warning.

So split the initrd logic into a separate function, allowing us to
declare prop only when we need it.

Built for both cases and booted with an initrd.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 31 insertions, 16 deletions

diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index caef555f2dc0..c065b5550368 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -716,11 +716,40 @@ static int __init early_init_dt_scan_cpus(unsigned long node,
         return 0;
 }
 
+#ifdef CONFIG_BLK_DEV_INITRD
+static void __init early_init_dt_check_for_initrd(unsigned long node)
+{
+        unsigned long l;
+        u32 *prop;
+
+        DBG("Looking for initrd properties... ");
+
+        prop = of_get_flat_dt_prop(node, "linux,initrd-start", &l);
+        if (prop) {
+                initrd_start = (unsigned long)__va(of_read_ulong(prop, l/4));
+
+                prop = of_get_flat_dt_prop(node, "linux,initrd-end", &l);
+                if (prop) {
+                        initrd_end = (unsigned long)
+                                        __va(of_read_ulong(prop, l/4));
+                        initrd_below_start_ok = 1;
+                } else {
+                        initrd_start = 0;
+                }
+        }
+
+        DBG("initrd_start=0x%lx  initrd_end=0x%lx\n", initrd_start, initrd_end);
+}
+#else
+static inline void early_init_dt_check_for_initrd(unsigned long node)
+{
+}
+#endif /* CONFIG_BLK_DEV_INITRD */
+
 static int __init early_init_dt_scan_chosen(unsigned long node,
                                             const char *uname, int depth, void *data)
 {
         unsigned long *lprop;
-        u32 *prop;
         unsigned long l;
         char *p;
 
@@ -762,21 +791,7 @@ static int __init early_init_dt_scan_chosen(unsigned long node,
                crashk_res.end = crashk_res.start + *lprop - 1;
 #endif
 
-#ifdef CONFIG_BLK_DEV_INITRD
-        DBG("Looking for initrd properties... ");
-        prop = of_get_flat_dt_prop(node, "linux,initrd-start", &l);
-        if (prop) {
-                initrd_start = (unsigned long)__va(of_read_ulong(prop, l/4));
-                prop = of_get_flat_dt_prop(node, "linux,initrd-end", &l);
-                if (prop) {
-                        initrd_end = (unsigned long)__va(of_read_ulong(prop, l/4));
-                        initrd_below_start_ok = 1;
-                } else {
-                        initrd_start = 0;
-                }
-        }
-        DBG("initrd_start=0x%lx  initrd_end=0x%lx\n", initrd_start, initrd_end);
-#endif /* CONFIG_BLK_DEV_INITRD */
+        early_init_dt_check_for_initrd(node);
 
         /* Retreive command line */
         p = of_get_flat_dt_prop(node, "bootargs", &l);