um: Add os_warn() for pre-boot warning/error messages

Add os_warn() for printing out pre-boot warning/error
messages in stderr. The messages via os_warn() are not
suppressed by quiet option.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Richard Weinberger <richard@nod.at>

2 files changed, 11 insertions, 0 deletions

diff --git a/arch/um/include/shared/os.h b/arch/um/include/shared/os.h
index 9e95bcebaf9b..574e03fc7ba2 100644
--- a/arch/um/include/shared/os.h
+++ b/arch/um/include/shared/os.h
@@ -244,6 +244,8 @@ extern void um_early_printk(const char *s, unsigned int n);
 extern void os_fix_helper_signals(void);
 extern void os_info(const char *fmt, ...)
         __attribute__ ((format (printf, 1, 2)));
+extern void os_warn(const char *fmt, ...)
+        __attribute__ ((format (printf, 1, 2)));
 
 /* time.c */
 extern void os_idle_sleep(unsigned long long nsecs);
diff --git a/arch/um/os-Linux/util.c b/arch/um/os-Linux/util.c
index c9bad1bca108..8cc8b2617a67 100644
--- a/arch/um/os-Linux/util.c
+++ b/arch/um/os-Linux/util.c
@@ -177,3 +177,12 @@ void os_info(const char *fmt, ...)
         vfprintf(stderr, fmt, list);
         va_end(list);
 }
+
+void os_warn(const char *fmt, ...)
+{
+        va_list list;
+
+        va_start(list, fmt);
+        vfprintf(stderr, fmt, list);
+        va_end(list);
+}