restore_sigcontext is not preempt safe

restore_sigcontext calls ia64_set_local_fpu_owner() which requires that preempt be disabled.

Index: linux/arch/ia64/kernel/signal.c
=================================--- linux.orig/arch/ia64/kernel/signal.c 2005-07-01 12:27:44.891940980 +1000
+++ linux/arch/ia64/kernel/signal.c 2005-07-01 15:57:08.479428221 +1000
@@ -143,6 +143,7 @@ restore_sigcontext (struct sigcontext __

__copy_from_user(current->thread.fph, &sc->sc_fr[32], 96*16);
psr->mfh = 0; /* drop signal handler's fph contents... */
+ preempt_disable();
if (psr->dfh)
ia64_drop_fpu(current);
else {
@@ -150,6 +151,7 @@ restore_sigcontext (struct sigcontext __
__ia64_load_fpu(current->thread.fph); ia64_set_local_fpu_owner(current);
}
+ preempt_enable();
}
return err;
}