Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / um / kernel / kmsg_dump.c

diff --git a/kernel/arch/um/kernel/kmsg_dump.c b/kernel/arch/um/kernel/kmsg_dump.c
new file mode 100644 (file)
index 0000000..407d492
--- /dev/null
+++ b/kernel/arch/um/kernel/kmsg_dump.c
@@ -0,0 +1,43 @@
+#include <linux/kmsg_dump.h>
+#include <linux/console.h>
+#include <shared/init.h>
+#include <shared/kern.h>
+#include <os.h>
+
+static void kmsg_dumper_stdout(struct kmsg_dumper *dumper,
+                               enum kmsg_dump_reason reason)
+{
+       static char line[1024];
+
+       size_t len = 0;
+       bool con_available = false;
+
+       /* only dump kmsg when no console is available */
+       if (!console_trylock())
+               return;
+
+       if (console_drivers != NULL)
+               con_available = true;
+
+       console_unlock();
+
+       if (con_available == true)
+               return;
+
+       printf("kmsg_dump:\n");
+       while (kmsg_dump_get_line(dumper, true, line, sizeof(line), &len)) {
+               line[len] = '\0';
+               printf("%s", line);
+       }
+}
+
+static struct kmsg_dumper kmsg_dumper = {
+       .dump = kmsg_dumper_stdout
+};
+
+int __init kmsg_dumper_stdout_init(void)
+{
+       return kmsg_dump_register(&kmsg_dumper);
+}
+
+__uml_postsetup(kmsg_dumper_stdout_init);