sh: Fix occasional FPU register corruption under preempt.
Presently with preempt enabled there's the possibility to be preempted
after the TIF_USEDFPU test and the register save, leading to bogus
state post-__switch_to(). Use an explicit preempt_disable()/enable()
pair around unlazy_fpu()/clear_fpu() to avoid this. Follows the x86
change.
Reported-by: Takuo Koguchi <takuo.koguchi.sw@hitachi.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/kernel/dump_task.c b/arch/sh/kernel/dump_task.c
index 4a8a408..1db7ce0 100644
--- a/arch/sh/kernel/dump_task.c
+++ b/arch/sh/kernel/dump_task.c
@@ -1,5 +1,6 @@
#include <linux/elfcore.h>
#include <linux/sched.h>
+#include <asm/fpu.h>
/*
* Capture the user space registers if the task is not running (in user space)