2.5.55-rmk1: user space lossage

[Christopher Hoover]

Aha!  This is the problem:

[ch at friction src]$ diff -B -w -Naurp linux-2.5.{52,53}/fs/jffs2 
diff -B -w -Naurp linux-2.5.52/fs/jffs2/file.c
linux-2.5.53/fs/jffs2/file.c
--- linux-2.5.52/fs/jffs2/file.c        2002-12-15 18:08:24.000000000
-0800
+++ linux-2.5.53/fs/jffs2/file.c        2002-12-23 21:21:34.000000000
-0800
@@ -58,7 +58,7 @@ struct file_operations jffs2_file_operat
        .read =         generic_file_read,
        .write =        generic_file_write,
        .ioctl =        jffs2_ioctl,
-       .mmap =         generic_file_mmap,
+       .mmap =         generic_file_readonly_mmap,
        .fsync =        jffs2_fsync,
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,29)
        .sendfile =     generic_file_sendfile
[ch at friction src]$ 

If you reverese this change, 2.5.55-rmk1 behaves.

-ch