[PATCH] uml: add a debugging message

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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c
index 9b34fe65949a..dda06789bcb0 100644
--- a/arch/um/os-Linux/skas/process.c
+++ b/arch/um/os-Linux/skas/process.c
@@ -419,9 +419,12 @@ void map_stub_pages(int fd, unsigned long code,
                                           .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;