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powerpc: copy_thread remove unused pkey code

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The pkey registers (AMR, IAMR) do not get loaded from the switch frame
so it is pointless to save anything there. Remove the dead code.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230325122904.2375060-2-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin 2023-03-25 22:28:57 +10:00 committed by Michael Ellerman
parent 78f0929884
commit c013e9f2bb
1 changed files with 1 additions and 11 deletions
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12
arch/powerpc/kernel/process.c
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@ -1813,6 +1813,7 @@ int copy_thread(struct task_struct *p, const struct kernel_clone_args *args)
sp -= STACK_SWITCH_FRAME_SIZE;
((unsigned long *)sp)[0] = sp + STACK_SWITCH_FRAME_SIZE;
kregs = (struct pt_regs *)(sp + STACK_SWITCH_FRAME_REGS);
kregs->nip = ppc_function_entry(f);
p->thread.ksp = sp;
#ifdef CONFIG_HAVE_HW_BREAKPOINT
@ -1845,17 +1846,6 @@ int copy_thread(struct task_struct *p, const struct kernel_clone_args *args)
p->thread.tidr = 0;
#endif
/*
* Run with the current AMR value of the kernel
*/
#ifdef CONFIG_PPC_PKEY
if (mmu_has_feature(MMU_FTR_BOOK3S_KUAP))
kregs->amr = AMR_KUAP_BLOCKED;
if (mmu_has_feature(MMU_FTR_BOOK3S_KUEP))
kregs->iamr = AMR_KUEP_BLOCKED;
#endif
kregs->nip = ppc_function_entry(f);
return 0;
}