Reimplement the lazy FP context switching:

o   Move all code into a single file for easier maintenance.
o   Use a single global lock to avoid having to handle either
    multiple locks or race conditions.
o   Make sure to disable the high FP registers after saving
    or dropping them.
o   use msleep() to wait for the other CPU to save the high
    FP registers.

This change fixes the high FP inconsistency panics.

A single global lock typically serializes too much, which may
be noticable when a lot of threads use the high FP registers,
but in that case it's probably better to switch the high FP
context synchronuously. Put differently: cpu_switch() should
switch the high FP registers if the incoming and outgoing
threads both use the high FP registers.

1 files changed, 0 insertions, 1 deletions

diff --git a/sys/ia64/include/proc.h b/sys/ia64/include/proc.h
index 5cbc0bf..6bf9c78 100644
--- a/sys/ia64/include/proc.h
+++ b/sys/ia64/include/proc.h
@@ -30,7 +30,6 @@
 #define	_MACHINE_PROC_H_
 
 struct mdthread {
-	struct mtx md_highfp_mtx;
 	int	md_spinlock_count;	/* (k) */
 	int	md_saved_intr;		/* (k) */
 };