[PATCH v3 4/6] um: Add os_warn() for pre-boot warning/error messages

From: Masami Hiramatsu
Date: Wed May 17 2017 - 13:19:51 EST


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@xxxxxxxxxx>
---
arch/um/include/shared/os.h | 2 ++
arch/um/os-Linux/util.c | 9 +++++++++
2 files changed, 11 insertions(+)

diff --git a/arch/um/include/shared/os.h b/arch/um/include/shared/os.h
index 9e95bce..574e03f 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 c9bad1b..8cc8b26 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);
+}