[PATCH] powerpc: Fix mem= cmdline handling on arch/powerpc for !MULTIPLATFORM

mem= command line option was being ignored in arch/powerpc if we were not
a CONFIG_MULTIPLATFORM (which is handled via prom_init stub). The initial
command line extraction and parsing needed to be moved earlier in the boot
process and have code to actual parse mem= and do something about it.

Also, fixed a compile warning in the file.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Acked-by: Segher Boessenkool <segher@kernel.crashing.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 38 insertions, 16 deletions

diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index 294832a7e0a6..6dbd21726770 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -816,8 +816,6 @@ void __init unflatten_device_tree(void)
 {
         unsigned long start, mem, size;
         struct device_node **allnextp = &allnodes;
-        char *p = NULL;
-        int l = 0;
 
         DBG(" -> unflatten_device_tree()\n");
 
@@ -857,19 +855,6 @@ void __init unflatten_device_tree(void)
         if (of_chosen == NULL)
                 of_chosen = of_find_node_by_path("/chosen@0");
 
-        /* Retreive command line */
-        if (of_chosen != NULL) {
-                p = (char *)get_property(of_chosen, "bootargs", &l);
-                if (p != NULL && l > 0)
-                        strlcpy(cmd_line, p, min(l, COMMAND_LINE_SIZE));
-        }
-#ifdef CONFIG_CMDLINE
-        if (l == 0 || (l == 1 && (*p) == 0))
-                strlcpy(cmd_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
-#endif /* CONFIG_CMDLINE */
-
-        DBG("Command line is: %s\n", cmd_line);
-
         DBG(" <- unflatten_device_tree()\n");
 }
 
@@ -940,6 +925,8 @@ static int __init early_init_dt_scan_chosen(unsigned long node,
 {
         u32 *prop;
         unsigned long *lprop;
+        unsigned long l;
+        char *p;
 
         DBG("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
 
@@ -1004,6 +991,41 @@ static int __init early_init_dt_scan_chosen(unsigned long node,
                crashk_res.end = crashk_res.start + *lprop - 1;
 #endif
 
+        /* Retreive command line */
+        p = of_get_flat_dt_prop(node, "bootargs", &l);
+        if (p != NULL && l > 0)
+                strlcpy(cmd_line, p, min((int)l, COMMAND_LINE_SIZE));
+
+#ifdef CONFIG_CMDLINE
+        if (l == 0 || (l == 1 && (*p) == 0))
+                strlcpy(cmd_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
+#endif /* CONFIG_CMDLINE */
+
+        DBG("Command line is: %s\n", cmd_line);
+
+        if (strstr(cmd_line, "mem=")) {
+                char *p, *q;
+                unsigned long maxmem = 0;
+
+                for (q = cmd_line; (p = strstr(q, "mem=")) != 0; ) {
+                        q = p + 4;
+                        if (p > cmd_line && p[-1] != ' ')
+                                continue;
+                        maxmem = simple_strtoul(q, &q, 0);
+                        if (*q == 'k' || *q == 'K') {
+                                maxmem <<= 10;
+                                ++q;
+                        } else if (*q == 'm' || *q == 'M') {
+                                maxmem <<= 20;
+                                ++q;
+                        } else if (*q == 'g' || *q == 'G') {
+                                maxmem <<= 30;
+                                ++q;
+                        }
+                }
+                memory_limit = maxmem;
+        }
+
         /* break now */
         return 1;
 }
@@ -1124,7 +1146,7 @@ static void __init early_reserve_mem(void)
                         size_32 = *(reserve_map_32++);
                         if (size_32 == 0)
                                 break;
-                        DBG("reserving: %lx -> %lx\n", base_32, size_32);
+                        DBG("reserving: %x -> %x\n", base_32, size_32);
                         lmb_reserve(base_32, size_32);
                 }
                 return;