Subject: [PATCH 1/2] powerpc/math-emu: move the flush FPU state function into do_mathemu

From: Kevin Hao <[email-masked]>
Date: Thu, 11 Jul 2013 20:21:54 +0800

By doing this we can make sure that the FPU state is only flushed to
the thread struct when it is really needed.

Signed-off-by: Kevin Hao <[email-masked]>
---
 arch/powerpc/kernel/traps.c  | 9 ---------
 arch/powerpc/math-emu/math.c | 9 +++++++++
 2 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index bf33c22..58a8065 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -1131,15 +1131,6 @@ void __kprobes program_check_exception(struct pt_regs *regs)
 	 * instruction or only on FP instructions, whether there is a
 	 * pattern to occurrences etc. -dgibson 31/Mar/2003
 	 */
-
-	/*
-	 * If we support a HW FPU, we need to ensure the FP state
-	 * if flushed into the thread_struct before attempting
-	 * emulation
-	 */
-#ifdef CONFIG_PPC_FPU
-	flush_fp_to_thread(current);
-#endif
 	switch (do_mathemu(regs)) {
 	case 0:
 		emulate_single_step(regs);
diff --git a/arch/powerpc/math-emu/math.c b/arch/powerpc/math-emu/math.c
index 3fe8e35..18ce6a7 100644
--- a/arch/powerpc/math-emu/math.c
+++ b/arch/powerpc/math-emu/math.c
@@ -420,6 +420,15 @@ do_mathemu(struct pt_regs *regs)
 		goto illegal;
 	}
 
+	/*
+	 * If we support a HW FPU, we need to ensure the FP state
+	 * if flushed into the thread_struct before attempting
+	 * emulation
+	 */
+#ifdef CONFIG_PPC_FPU
+	flush_fp_to_thread(current);
+#endif
+
 	eflag = func(op0, op1, op2, op3);
 
 	if (insn & 1) {
-- 
1.8.1.4