[PATCH] fix for sigio delivery

[Stephen Rothwell]

Hi Linus,

This patch means that we keep the upper 16 bits of the si_code
field of the siginfo structure that is delivered with and SIGIOs.
We need this so that the code that actually copies the siginfo_t
out to user mode knows which part of the union to copy.  We currently
get away with out this information because we always copy at least
two ints worth of the union, but this s an ugly hack and I would
like to tidy it up.

Comments?

-- 
Cheers,
Stephen Rothwell                    [e-mail]
http://www.canb.auug.org.au/~sfr/

diff -ruN 2.5.15/fs/fcntl.c 2.5.15-si.3/fs/fcntl.c
--- 2.5.15/fs/fcntl.c	Tue Apr 23 10:42:27 2002
+++ 2.5.15-si.3/fs/fcntl.c	Wed May 15 16:46:48 2002
@@ -435,7 +435,7 @@
 			   back to SIGIO in that case. --sct */
 			si.si_signo = fown->signum;
 			si.si_errno = 0;
-		        si.si_code  = reason & ~__SI_MASK;
+		        si.si_code  = reason;
 			/* Make sure we are called with one of the POLL_*
 			   reasons, otherwise we could leak kernel stack into
 			   userspace.  */