libkse: One more bug in kernel?

[Andrew Belashov]

Hi!

I have found a bug in kernel.

Here a patch with short explanation.

See also my development set of patches for libkse:

<http://www.orel.ru/~bel/patches/libkse.patch>

--
Best regards,
Andrew Belashov.
-------------- next part --------------
--- sys/sparc64/sparc64/machdep.c.orig	Thu Aug  5 09:42:40 2004
+++ sys/sparc64/sparc64/machdep.c	Tue Sep 28 15:11:08 2004
@@ -623,6 +623,11 @@ set_mcontext(struct thread *td, const mc
 	tf = td->td_frame;
 	pcb = td->td_pcb;
 	wstate = tf->tf_wstate;
+	/* XXXKSE Make sure the pre-trap windows are spilled.
+	 * This is needed for kse_switchin(2) for correct switching between
+	 * threads stacks.
+	 */
+	flushw();
 	bcopy(mc, tf, sizeof(*tf));
 	tf->tf_wstate = wstate;
 	if ((mc->mc_fprs & FPRS_FEF) != 0) {