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| author | Kevin Hao <haokexin@gmail.com> | 2013-07-14 11:02:05 +0200 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-08-14 06:59:44 +0200 |
| commit | 037f0eed57c3f35367ac32275e45f24e297549e9 (patch) | |
| tree | 87dbec64efb721dae5fd8b0a5c2b634f882631dd /arch/powerpc/math-emu | |
| parent | powerpc: Remove the redundant flush_fp_to_thread() in setup_sigcontext() (diff) | |
| download | linux-037f0eed57c3f35367ac32275e45f24e297549e9.tar.xz linux-037f0eed57c3f35367ac32275e45f24e297549e9.zip | |
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.c | 3 |
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); |