On Thu, 28 Jul 2016 00:18:15 +1000
Michael Ellerman <m...@ellerman.id.au> wrote:
> From: Kevin Hao <haoke...@gmail.com>
>
> As we just did for CPU features.
>
> Signed-off-by: Kevin Hao <haoke...@gmail.com>
> Signed-off-by: Aneesh Kumar K.V <aneesh.ku...@linux.vnet.ibm.com>
> Signed-off-by: Michael Ellerman <m...@ellerman.id.au>
> ---
> arch/powerpc/include/asm/mmu.h | 36
> ++++++++++++++++++++++++++++++++++++
> arch/powerpc/kernel/cputable.c | 17 +++++++++++++++++
> arch/powerpc/lib/feature-fixups.c | 1 + 3 files changed, 54
> insertions(+)
>
> v3: Rename to mmu_feature_keys, and NUM_MMU_FTR_KEYS.
> Use the kconfig.
>
> diff --git a/arch/powerpc/include/asm/mmu.h
> b/arch/powerpc/include/asm/mmu.h index e3eff365e55d..3900cb7fe7cf
> 100644 --- a/arch/powerpc/include/asm/mmu.h
> +++ b/arch/powerpc/include/asm/mmu.h
> @@ -140,6 +140,41 @@ static inline bool __mmu_has_feature(unsigned
> long feature) return !!(MMU_FTRS_POSSIBLE &
> cur_cpu_spec->mmu_features & feature); }
>
> +#ifdef CONFIG_JUMP_LABEL_FEATURE_CHECKS
> +#include <linux/jump_label.h>
> +
> +#define NUM_MMU_FTR_KEYS 32
> +
> +extern struct static_key_true mmu_feature_keys[NUM_MMU_FTR_KEYS];
> +
> +extern void mmu_feature_keys_init(void);
> +
> +static __always_inline bool mmu_has_feature(unsigned long feature)
> +{
> + int i;
> +
> + if (!(MMU_FTRS_POSSIBLE & feature))
> + return false;
> +
> + i = __builtin_ctzl(feature);
> + return static_branch_likely(&mmu_feature_keys[i]);
> +}
And here.
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