[MIPS] Cleanup memory managment initialization.

Historically plat_mem_setup did the entire platform initialization.  This
was rather impractical because it meant plat_mem_setup had to get away
without any kind of memory allocator.  To keep old code from breaking
plat_setup was just renamed to plat_setup and a second platform
initialization hook for anything else was introduced.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 43 insertions, 13 deletions

diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index 397a70e..bfcec8d 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -442,6 +442,48 @@ static inline void bootmem_init(void)
 #endif /* CONFIG_BLK_DEV_INITRD  */
 }
 
+/*
+ * arch_mem_init - initialize memory managment subsystem
+ *
+ *  o plat_mem_setup() detects the memory configuration and will record detected
+ *    memory areas using add_memory_region.
+ *  o parse_cmdline_early() parses the command line for mem= options which,
+ *    iff detected, will override the results of the automatic detection.
+ *
+ * At this stage the memory configuration of the system is known to the
+ * kernel but generic memory managment system is still entirely uninitialized.
+ *
+ *  o bootmem_init()
+ *  o sparse_init()
+ *  o paging_init()
+ *
+ * At this stage the bootmem allocator is ready to use.
+ *
+ * NOTE: historically plat_mem_setup did the entire platform initialization.
+ *       This was rather impractical because it meant plat_mem_setup had to
+ * get away without any kind of memory allocator.  To keep old code from
+ * breaking plat_setup was just renamed to plat_setup and a second platform
+ * initialization hook for anything else was introduced.
+ */
+
+extern void plat_mem_setup(void);
+
+static void __init arch_mem_init(char **cmdline_p)
+{
+	/* call board setup routine */
+	plat_mem_setup();
+
+	strlcpy(command_line, arcs_cmdline, sizeof(command_line));
+	strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
+
+	*cmdline_p = command_line;
+
+	parse_cmdline_early();
+	bootmem_init();
+	sparse_init();
+	paging_init();
+}
+
 static inline void resource_init(void)
 {
 	int i;
@@ -495,8 +537,6 @@ static inline void resource_init(void)
 #undef MAXMEM
 #undef MAXMEM_PFN
 
-extern void plat_setup(void);
-
 void __init setup_arch(char **cmdline_p)
 {
 	cpu_probe();
@@ -511,18 +551,8 @@ void __init setup_arch(char **cmdline_p)
 #endif
 #endif
 
-	/* call board setup routine */
-	plat_setup();
+	arch_mem_init(cmdline_p);
 
-	strlcpy(command_line, arcs_cmdline, sizeof(command_line));
-	strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
-
-	*cmdline_p = command_line;
-
-	parse_cmdline_early();
-	bootmem_init();
-	sparse_init();
-	paging_init();
 	resource_init();
 #ifdef CONFIG_SMP
 	plat_smp_setup();