From: Paul Mundt <lethal@linux-sh.org>
Date: Wed, 26 Mar 2008 10:09:21 +0000 (+0900)
Subject: sh: Fix TIF_USEDFPU clearing under FPU emulation.
X-Git-Tag: v2.6.25-rc8~3^2~2
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=138bed154eab2205b4ef93f02f5feb1edf6d8552;p=linux-2.6

sh: Fix TIF_USEDFPU clearing under FPU emulation.

The unlazy_fpu() path calls in to save_fpu() if the task has
TIF_USEDFPU set. save_fpu() being the crap API that it is has the side
effect of clearing the flag itself, which presently doesn't happen
if we're using FPU emulation. Fix this up for now, pending an overhaul
in 2.6.26.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
---

diff --git a/include/asm-sh/fpu.h b/include/asm-sh/fpu.h
index f89abf5920..91462fea15 100644
--- a/include/asm-sh/fpu.h
+++ b/include/asm-sh/fpu.h
@@ -20,9 +20,14 @@ struct task_struct;
 
 extern void save_fpu(struct task_struct *__tsk, struct pt_regs *regs);
 #else
+
 #define release_fpu(regs)	do { } while (0)
 #define grab_fpu(regs)		do { } while (0)
-#define save_fpu(tsk, regs)	do { } while (0)
+
+static inline void save_fpu(struct task_struct *tsk, struct pt_regs *regs)
+{
+	clear_tsk_thread_flag(tsk, TIF_USEDFPU);
+}
 #endif
 
 extern int do_fpu_inst(unsigned short, struct pt_regs *);