From: Jeff Dike <jdike@addtoit.com>

Add a debugging message in the case that mapping a stub fails.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/um/os-Linux/skas/process.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff -puN arch/um/os-Linux/skas/process.c~uml-add-a-debugging-message arch/um/os-Linux/skas/process.c
--- a/arch/um/os-Linux/skas/process.c~uml-add-a-debugging-message
+++ a/arch/um/os-Linux/skas/process.c
@@ -419,9 +419,12 @@ void map_stub_pages(int fd, unsigned lon
 					  .offset  = code_offset
 	} } });
 	n = os_write_file(fd, &mmop, sizeof(mmop));
-	if(n != sizeof(mmop))
+	if(n != sizeof(mmop)){
+		printk("mmap args - addr = 0x%lx, fd = %d, offset = %llx\n",
+		       code, code_fd, (unsigned long long) code_offset);
 		panic("map_stub_pages : /proc/mm map for code failed, "
 		      "err = %d\n", -n);
+	}
 
 	if ( stack ) {
 		__u64 map_offset;
_