linux-kernel - [RFC PATCH 6/7] um: Suppress non-fatal messages when quiet

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Message-Id: <149337519863.14717.14783366681891976827.stgit@devbox>
Date:   Fri, 28 Apr 2017 19:26:48 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Jeff Dike <jdike@...toit.com>, Richard Weinberger <richard@....at>
Cc:     Masami Hiramatsu <mhiramat@...nel.org>,
        user-mode-linux-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org
Subject: [RFC PATCH 6/7] um: Suppress non-fatal messages when quiet

Suppress non-fatal boot messages when "quiet" kernel
parameter is given.

Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
---
 arch/um/os-Linux/util.c |   16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/arch/um/os-Linux/util.c b/arch/um/os-Linux/util.c
index 8745f23..7afcb41 100644
--- a/arch/um/os-Linux/util.c
+++ b/arch/um/os-Linux/util.c
@@ -13,6 +13,7 @@
 #include <wait.h>
 #include <sys/mman.h>
 #include <sys/utsname.h>
+#include <init.h>
 #include <os.h>
 
 void stack_protections(unsigned long address)
@@ -153,10 +154,25 @@ void um_early_printk(const char *s, unsigned int n)
 	printf("%.*s", n, s);
 }
 
+static int quiet_non_fatal;
+
+static int __init quiet_cmd_param(char *str, int *add)
+{
+	quiet_non_fatal = 1;
+	return 0;
+}
+
+__uml_setup("quiet", quiet_cmd_param,
+"quiet\n"
+"    Turns off non-fatal message during boot.\n\n");
+
 void non_fatal(const char *fmt, ...)
 {
 	va_list list;
 
+	if (quiet_non_fatal)
+		return;
+
 	va_start(list, fmt);
 	vfprintf(stderr, fmt, list);
 	va_end(list);