On Thu, 2016-21-01 at 00:55:46 UTC, Cyril Bur wrote:
> This prepares for the decoupling of saving {fpu,altivec,vsx} registers and
> marking {fpu,altivec,vsx} as being unused by a thread.
>
> Currently giveup_{fpu,altivec,vsx}() does both however optimisations to
> task switching can be made if these two operations are decoupled.
> save_all() will permit the saving of registers to thread structs and leave
> threads MSR with bits enabled.
>
> This patch introduces no functional change.
> diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
> index 0955b7c..45e37c0 100644
> --- a/arch/powerpc/kernel/process.c
> +++ b/arch/powerpc/kernel/process.c
> @@ -349,6 +349,14 @@ void flush_spe_to_thread(struct task_struct *tsk)
> preempt_enable();
> }
> }
> +#else
> +/*
> + * save_all() is going to test MSR_SPE, rather than pull in all the
> + * booke definitions all the time on a books kernel just ensure it exists
> + * but acts as a nop.
> + */
> +
> +#define MSR_SPE 0
> #endif /* CONFIG_SPE */
Building corenet32/64_defconfig this gives me:
arch/powerpc/kernel/process.c:392:0: error: "MSR_SPE" redefined [-Werror]
#define MSR_SPE 0
^
In file included from ./arch/powerpc/include/asm/reg.h:18:0,
from ./arch/powerpc/include/asm/processor.h:13,
from ./arch/powerpc/include/asm/thread_info.h:33,
from include/linux/thread_info.h:54,
from include/asm-generic/preempt.h:4,
from arch/powerpc/include/generated/asm/preempt.h:1,
from include/linux/preempt.h:59,
from include/linux/spinlock.h:50,
from include/linux/seqlock.h:35,
from include/linux/time.h:5,
from include/uapi/linux/timex.h:56,
from include/linux/timex.h:56,
from include/linux/sched.h:19,
from arch/powerpc/kernel/process.c:18:
./arch/powerpc/include/asm/reg_booke.h:33:0: note: this is the location of
the previous definition
#define MSR_SPE __MASK(MSR_SPE_LG)
^
cc1: all warnings being treated as errors
scripts/Makefile.build:258: recipe for target 'arch/powerpc/kernel/process.o'
failed
make[1]: *** [arch/powerpc/kernel/process.o] Error 1
make[1]: *** Waiting for unfinished jobs....
Makefile:950: recipe for target 'arch/powerpc/kernel' failed
cheers
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