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powerpc/mm/radix: Add dummy radix_enabled()

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In this patch we add the radix Kconfig and conditional check.
radix_enabled() is written to always return 0 here. Once we have all
needed radix changes added, we will update this to an mmu_feature check.

We need to add this early so that we can get it all build in the early
stage.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Aneesh Kumar K.V 2016-04-29 23:25:53 +10:00 committed by Michael Ellerman
parent b0b5e9b130
commit 566ca99af0
3 changed files with 14 additions and 0 deletions
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2
arch/powerpc/include/asm/book3s/64/mmu.h
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@ -19,6 +19,8 @@ struct mmu_psize_def {
unsigned long sllp; /* SLB L||LP (exact mask to use in slbmte) */
};
extern struct mmu_psize_def mmu_psize_defs[MMU_PAGE_COUNT];
#define radix_enabled() (0)
#endif /* __ASSEMBLY__ */
/* 64-bit classic hash table MMU */

3
arch/powerpc/include/asm/mmu.h
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@ -204,6 +204,9 @@ static inline void assert_pte_locked(struct mm_struct *mm, unsigned long addr)
# include <asm/mmu-8xx.h>
#endif
#ifndef radix_enabled
#define radix_enabled() (0)
#endif
#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_MMU_H_ */

9
arch/powerpc/platforms/Kconfig.cputype
View File

@ -331,6 +331,15 @@ config PPC_STD_MMU_64
def_bool y
depends on PPC_STD_MMU && PPC64
config PPC_RADIX_MMU
bool "Radix MMU Support"
depends on PPC_BOOK3S_64
default y
help
Enable support for the Power ISA 3.0 Radix style MMU. Currently this
is only implemented by IBM Power9 CPUs, if you don't have one of them
you can probably disable this.
config PPC_MMU_NOHASH
def_bool y
depends on !PPC_STD_MMU