init/main.c: improve usability in case of init binary failure

- new Documentation/init.txt file describing various forms of failure
  trying to load the init binary after kernel bootup

- extend the init/main.c init failure message to direct to
  Documentation/init.txt

Signed-off-by: Andreas Mohr <andi@lisas.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/init/main.c b/init/main.c
index 41d0f10dbbc7..b09a828f38b5 100644
--- a/init/main.c
+++ b/init/main.c
@@ -847,7 +847,8 @@ static noinline int init_post(void)
         run_init_process("/bin/init");
         run_init_process("/bin/sh");
 
-        panic("No init found.  Try passing init= option to kernel.");
+        panic("No init found.  Try passing init= option to kernel. "
+              "See Linux Documentation/init.txt for guidance.");
 }
 
 static int __init kernel_init(void * unused)