Merge tag 'dma-mapping-4.20' of git://git.infradead.org/users/hch/dma-mapping

[linux-2.6-block.git] / arch / mips / kernel / setup.c

diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index 6d840a44fa3659c66a095f0d599e538603d2489f..e64b9e8bb002e522bea9c199033f5f4940bf84a7 100644 (file)
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -846,6 +846,34 @@ static void __init arch_mem_init(char **cmdline_p)
        struct memblock_region *reg;
        extern void plat_mem_setup(void);
 
+       /*
+        * Initialize boot_command_line to an innocuous but non-empty string in
+        * order to prevent early_init_dt_scan_chosen() from copying
+        * CONFIG_CMDLINE into it without our knowledge. We handle
+        * CONFIG_CMDLINE ourselves below & don't want to duplicate its
+        * content because repeating arguments can be problematic.
+        */
+       strlcpy(boot_command_line, " ", COMMAND_LINE_SIZE);
+
+       /* call board setup routine */
+       plat_mem_setup();
+
+       /*
+        * Make sure all kernel memory is in the maps.  The "UP" and
+        * "DOWN" are opposite for initdata since if it crosses over
+        * into another memory section you don't want that to be
+        * freed when the initdata is freed.
+        */
+       arch_mem_addpart(PFN_DOWN(__pa_symbol(&_text)) << PAGE_SHIFT,
+                        PFN_UP(__pa_symbol(&_edata)) << PAGE_SHIFT,
+                        BOOT_MEM_RAM);
+       arch_mem_addpart(PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT,
+                        PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT,
+                        BOOT_MEM_INIT_RAM);
+
+       pr_info("Determined physical RAM map:\n");
+       print_memory_map();
+
 #if defined(CONFIG_CMDLINE_BOOL) && defined(CONFIG_CMDLINE_OVERRIDE)
        strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 #else
@@ -873,26 +901,6 @@ static void __init arch_mem_init(char **cmdline_p)
        }
 #endif
 #endif
-
-       /* call board setup routine */
-       plat_mem_setup();
-
-       /*
-        * Make sure all kernel memory is in the maps.  The "UP" and
-        * "DOWN" are opposite for initdata since if it crosses over
-        * into another memory section you don't want that to be
-        * freed when the initdata is freed.
-        */
-       arch_mem_addpart(PFN_DOWN(__pa_symbol(&_text)) << PAGE_SHIFT,
-                        PFN_UP(__pa_symbol(&_edata)) << PAGE_SHIFT,
-                        BOOT_MEM_RAM);
-       arch_mem_addpart(PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT,
-                        PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT,
-                        BOOT_MEM_INIT_RAM);
-
-       pr_info("Determined physical RAM map:\n");
-       print_memory_map();
-
        strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 
        *cmdline_p = command_line;