Blackfin arch: Enable earlyprintk earlier - so any error after our interrupt tables are set up will print out

Also ensure that the traps_c code doesn't cause a double fault, by
sending a signal to a faulting kernel before the memory subsystem
is fully initialized, by printing out the error message before sending
the signal.

Signed-off-by: Robin Getz <robin.getz@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>

2 files changed, 25 insertions, 21 deletions

diff --git a/arch/blackfin/kernel/setup.c b/arch/blackfin/kernel/setup.c
index abf34a8dd070..8dcd76e87ed5 100644
--- a/arch/blackfin/kernel/setup.c
+++ b/arch/blackfin/kernel/setup.c
@@ -44,6 +44,7 @@
 #include <asm/blackfin.h>
 #include <asm/cplbinit.h>
 #include <asm/fixed_code.h>
+#include <asm/early_printk.h>
 
 u16 _bfin_swrst;
 
@@ -157,8 +158,10 @@ static __init void parse_cmdline_early(char *cmdline_p)
                                                             1;
                                         }
                                 }
+                        } else if (!memcmp(to, "earlyprintk=", 12)) {
+                                to += 12;
+                                setup_early_printk(to);
                         }
-
                 }
                 c = *(to++);
                 if (!c)
@@ -177,6 +180,23 @@ void __init setup_arch(char **cmdline_p)
 #ifdef CONFIG_DUMMY_CONSOLE
         conswitchp = &dummy_con;
 #endif
+
+#if defined(CONFIG_CMDLINE_BOOL)
+        strncpy(&command_line[0], CONFIG_CMDLINE, sizeof(command_line));
+        command_line[sizeof(command_line) - 1] = 0;
+#endif
+
+        /* Keep a copy of command line */
+        *cmdline_p = &command_line[0];
+        memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
+        boot_command_line[COMMAND_LINE_SIZE - 1] = '\0';
+
+        /* setup memory defaults from the user config */
+        physical_mem_end = 0;
+        _ramend = CONFIG_MEM_SIZE * 1024 * 1024;
+
+        parse_cmdline_early(&command_line[0]);
+
         cclk = get_cclk();
         sclk = get_sclk();
 
@@ -210,22 +230,6 @@ void __init setup_arch(char **cmdline_p)
         flash_probe();
 #endif
 
-#if defined(CONFIG_CMDLINE_BOOL)
-        strncpy(&command_line[0], CONFIG_CMDLINE, sizeof(command_line));
-        command_line[sizeof(command_line) - 1] = 0;
-#endif
-
-        /* Keep a copy of command line */
-        *cmdline_p = &command_line[0];
-        memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
-        boot_command_line[COMMAND_LINE_SIZE - 1] = '\0';
-
-        /* setup memory defaults from the user config */
-        physical_mem_end = 0;
-        _ramend = CONFIG_MEM_SIZE * 1024 * 1024;
-
-        parse_cmdline_early(&command_line[0]);
-
         if (physical_mem_end == 0)
                 physical_mem_end = _ramend;
 
diff --git a/arch/blackfin/kernel/traps.c b/arch/blackfin/kernel/traps.c
index ba68eb2ec929..8823e9ade584 100644
--- a/arch/blackfin/kernel/traps.c
+++ b/arch/blackfin/kernel/traps.c
@@ -402,10 +402,6 @@ asmlinkage void trap_c(struct pt_regs *fp)
                 break;
         }
 
-        info.si_signo = sig;
-        info.si_errno = 0;
-        info.si_addr = (void *)fp->pc;
-        force_sig_info(sig, &info, current);
         if (sig != 0 && sig != SIGTRAP) {
                 unsigned long stack;
                 dump_bfin_regs(fp, (void *)fp->retx);
@@ -414,6 +410,10 @@ asmlinkage void trap_c(struct pt_regs *fp)
                 if (current->mm == NULL)
                         panic("Kernel exception");
         }
+        info.si_signo = sig;
+        info.si_errno = 0;
+        info.si_addr = (void *)fp->pc;
+        force_sig_info(sig, &info, current);
 
         /* if the address that we are about to return to is not valid, set it
          * to a valid address, if we have a current application or panic