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powerpc: introduce get_mm_addr_key() helper

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get_mm_addr_key() helper returns the pkey associated with
an address corresponding to a given mm_struct.

Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Ram Pai
2018-01-18 17:50:41 -08:00
committed by Michael Ellerman
parent e6c2a4797e
commit 087003e9ef
2 changed files with 33 additions and 0 deletions
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9
arch/powerpc/include/asm/mmu.h
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@@ -260,6 +260,15 @@ static inline bool early_radix_enabled(void)
}
#endif
#ifdef CONFIG_PPC_MEM_KEYS
extern u16 get_mm_addr_key(struct mm_struct *mm, unsigned long address);
#else
static inline u16 get_mm_addr_key(struct mm_struct *mm, unsigned long address)
{
return 0;
}
#endif /* CONFIG_PPC_MEM_KEYS */
#endif /* !__ASSEMBLY__ */
/* The kernel use the constants below to index in the page sizes array.