[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>

diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c
index 9b34fe65949a689b97fe004afe00f49f27a32b86..dda06789bcb01f7d8edf4dec2a264723a4fb7f9f 100644 (file)
--- 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;