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authorKevin Hao <haokexin@gmail.com>2013-07-14 17:02:05 +0800
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2013-08-14 14:59:44 +1000
commit037f0eed57c3f35367ac32275e45f24e297549e9 (patch)
tree87dbec64efb721dae5fd8b0a5c2b634f882631dd /arch/powerpc/math-emu
parent662499d04b6bc73d0ecab0ab876bacd5bbe7d6a7 (diff)
downloadlinux-037f0eed57c3f35367ac32275e45f24e297549e9.tar.bz2
powerpc: Make flush_fp_to_thread() nop when CONFIG_PPC_FPU is disabled
In the current kernel, the function flush_fp_to_thread() is not dependent on CONFIG_PPC_FPU. So most invocations of this function is not wrapped by CONFIG_PPC_FPU. Even through we don't really save the FPRs to the thread struct if CONFIG_PPC_FPU is not enabled, but there does have some runtime overhead such as the check for tsk->thread.regs and preempt disable and enable. It really make no sense to do that. So make it a nop when CONFIG_PPC_FPU is disabled. Also remove the wrapped #ifdef CONFIG_PPC_FPU when invoking this function. Signed-off-by: Kevin Hao <haokexin@gmail.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/math-emu')
-rw-r--r--arch/powerpc/math-emu/math.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/powerpc/math-emu/math.c b/arch/powerpc/math-emu/math.c
index 49eb2ac08fd3..bc901623d8df 100644
--- a/arch/powerpc/math-emu/math.c
+++ b/arch/powerpc/math-emu/math.c
@@ -7,6 +7,7 @@
#include <asm/uaccess.h>
#include <asm/reg.h>
+#include <asm/switch_to.h>
#include <asm/sfp-machine.h>
#include <math-emu/double.h>
@@ -433,9 +434,7 @@ do_mathemu(struct pt_regs *regs)
* is flushed into the thread_struct before attempting
* emulation
*/
-#ifdef CONFIG_PPC_FPU
flush_fp_to_thread(current);
-#endif
eflag = func(op0, op1, op2, op3);