Blackfin arch: fix bug - kgdb fails to continue after setting breakpo…

…int on bf561-ezkit kernel with smp patch

Free spinlock before call IPI handlers.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>


Header from folded patch 'blackfin_arch__fix_bug_-_kgdb_fails_to_continue_after_setting_breakpoint_on_bf561-ezkit_kernel_with_smp_patch-1':

Blackfin arch: fix bug - kgdb fails to continue after setting breakpoint on bf561-ezkit kernel with smp patch

Don't test l1 code in SMP kernel.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

arch/blackfin/kernel/kgdb_test.c

@@ -20,6 +20,7 @@
 static char cmdline[256];
 static unsigned long len;
 
+#ifndef CONFIG_SMP
 static int num1 __attribute__((l1_data));
 
 void kgdb_l1_test(void) __attribute__((l1_text));
@@ -32,6 +33,8 @@ void kgdb_l1_test(void)
 	printk(KERN_ALERT "L1(after change) : data variable addr = 0x%p, data value is %d\n", &num1, num1);
 	return ;
 }
+#endif
+
 #if L2_LENGTH
 
 static int num2 __attribute__((l2));
@@ -59,10 +62,12 @@ int kgdb_test(char *name, int len, int count, int z)
 static int test_proc_output(char *buf)
 {
 	kgdb_test("hello world!", 12, 0x55, 0x10);
+#ifndef CONFIG_SMP
 	kgdb_l1_test();
-	#if L2_LENGTH
+#endif
+#if L2_LENGTH
 	kgdb_l2_test();
-	#endif
+#endif
 
 	return 0;
 }

arch/blackfin/mach-common/smp.c

@@ -158,10 +158,14 @@ static irqreturn_t ipi_handler(int irq, void *dev_instance)
 			kfree(msg);
 			break;
 		case BFIN_IPI_CALL_FUNC:
+			spin_unlock(&msg_queue->lock);
 			ipi_call_function(cpu, msg);
+			spin_lock(&msg_queue->lock);
 			break;
 		case BFIN_IPI_CPU_STOP:
+			spin_unlock(&msg_queue->lock);
 			ipi_cpu_stop(cpu);
+			spin_lock(&msg_queue->lock);
 			kfree(msg);
 			break;
 		default:
@@ -457,7 +461,7 @@ void smp_icache_flush_range_others(unsigned long start, unsigned long end)
 	smp_flush_data.start = start;
 	smp_flush_data.end = end;
 
-	if (smp_call_function(&ipi_flush_icache, &smp_flush_data, 1))
+	if (smp_call_function(&ipi_flush_icache, &smp_flush_data, 0))
 		printk(KERN_WARNING "SMP: failed to run I-cache flush request on other CPUs\n");
 }
 EXPORT_SYMBOL_GPL(smp_icache_flush_range_others);