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| author | Kevin Hao <haokexin@gmail.com> | 2013-07-14 17:02:05 +0800 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-08-14 14:59:44 +1000 |
| commit | 037f0eed57c3f35367ac32275e45f24e297549e9 (patch) | |
| tree | 87dbec64efb721dae5fd8b0a5c2b634f882631dd /arch/powerpc/kernel/process.c | |
| parent | 662499d04b6bc73d0ecab0ab876bacd5bbe7d6a7 (diff) | |
| download | blackbird-op-linux-037f0eed57c3f35367ac32275e45f24e297549e9.tar.gz blackbird-op-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/kernel/process.c')
| -rw-r--r-- | arch/powerpc/kernel/process.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index c517dbe705fd..0ec255a81c66 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -74,6 +74,7 @@ struct task_struct *last_task_used_vsx = NULL; struct task_struct *last_task_used_spe = NULL; #endif +#ifdef CONFIG_PPC_FPU /* * Make sure the floating-point register state in the * the thread_struct is up to date for task tsk. @@ -107,6 +108,7 @@ void flush_fp_to_thread(struct task_struct *tsk) } } EXPORT_SYMBOL_GPL(flush_fp_to_thread); +#endif void enable_kernel_fp(void) { |
