microblaze: Fix bug with passing command line
When u-boot passes control over to Linux it places the Linux command
line between to the end of __init_end. When space between
__init_end and __bss_start is not COMMAND_LINE_SIZE then
the part of cmdline can be lost.
In extreme case if __init_end == __bss_start u-boot can't pass
any cmdline to Linux kernel.
This patch fix this issue by copying cmd line directly to
cmd_line char array which is placed in data section.
Reported-by: David Mc Andrew <david.mcandrew@xilinx.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>
diff --git a/arch/microblaze/kernel/setup.c b/arch/microblaze/kernel/setup.c
index 4da971d..9dbc9ec 100644
--- a/arch/microblaze/kernel/setup.c
+++ b/arch/microblaze/kernel/setup.c
@@ -40,7 +40,12 @@
DEFINE_PER_CPU(unsigned int, CURRENT_SAVE); /* Saved current pointer */
unsigned int boot_cpuid;
-char cmd_line[COMMAND_LINE_SIZE];
+/*
+ * Placed cmd_line to .data section because can be initialized from
+ * ASM code. Default position is BSS section which is cleared
+ * in machine_early_init().
+ */
+char cmd_line[COMMAND_LINE_SIZE] __attribute__ ((section(".data")));
void __init setup_arch(char **cmdline_p)
{
@@ -130,12 +135,6 @@
memset(__bss_start, 0, __bss_stop-__bss_start);
memset(_ssbss, 0, _esbss-_ssbss);
- /* Copy command line passed from bootloader */
-#ifndef CONFIG_CMDLINE_BOOL
- if (cmdline && cmdline[0] != '\0')
- strlcpy(cmd_line, cmdline, COMMAND_LINE_SIZE);
-#endif
-
lockdep_init();
/* initialize device tree for usage in early_printk */