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powerpc/pkeys: Remove unused code 

This removes arch_supports_pkeys(), arch_usable_pkeys() and
thread_pkey_regs_*() which are remnants from the following:

commit 06bb53b338 ("powerpc: store and restore the pkey state across context switches")
commit 2cd4bd192e ("powerpc/pkeys: Fix handling of pkey state across fork()")
commit cf43d3b264 ("powerpc: Enable pkey subsystem")

arch_supports_pkeys() and arch_usable_pkeys() were unused
since their introduction while thread_pkey_regs_*() became
unused after the introduction of the following:

commit d5fa30e699 ("powerpc/book3s64/pkeys: Reset userspace AMR correctly on exec")
commit 48a8ab4eeb ("powerpc/book3s64/pkeys: Don't update SPRN_AMR when in kernel mode")

Signed-off-by: Sandipan Das <sandipan@linux.ibm.com>
Reviewed-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210202150050.75335-1-sandipan@linux.ibm.com
This commit is contained in:
Sandipan Das 2021-02-02 20:30:50 +05:30 committed by Michael Ellerman
parent ea7826583f
commit 266d8f7586
2 changed files with 0 additions and 9 deletions
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3
arch/powerpc/include/asm/mmu_context.h
View File

@ -282,9 +282,6 @@ static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
}
#define pkey_mm_init(mm)
#define thread_pkey_regs_save(thread)
#define thread_pkey_regs_restore(new_thread, old_thread)
#define thread_pkey_regs_init(thread)
#define arch_dup_pkeys(oldmm, mm)
static inline u64 pte_to_hpte_pkey_bits(u64 pteflags, unsigned long flags)

6
arch/powerpc/include/asm/pkeys.h
View File

@ -169,10 +169,4 @@ static inline bool arch_pkeys_enabled(void)
}
extern void pkey_mm_init(struct mm_struct *mm);
extern bool arch_supports_pkeys(int cap);
extern unsigned int arch_usable_pkeys(void);
extern void thread_pkey_regs_save(struct thread_struct *thread);
extern void thread_pkey_regs_restore(struct thread_struct *new_thread,
struct thread_struct *old_thread);
extern void thread_pkey_regs_init(struct thread_struct *thread);
#endif /*_ASM_POWERPC_KEYS_H */