From: Nicholas Piggin <npiggin@gmail.com>
To: linuxppc-dev@lists.ozlabs.org
Cc: Nicholas Piggin <npiggin@gmail.com>
Subject: [PATCH 1/8] powerpc: copy_thread remove unused pkey code
Date: Wed, 1 Feb 2023 02:55:27 +1000 [thread overview]
Message-ID: <20230131165534.601490-2-npiggin@gmail.com> (raw)
In-Reply-To: <20230131165534.601490-1-npiggin@gmail.com>
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>
---
arch/powerpc/kernel/process.c | 12 +-----------
1 file changed, 1 insertion(+), 11 deletions(-)
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index c22cc234672f..ba10505f62c1 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -1814,6 +1814,7 @@ 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
@@ -1846,17 +1847,6 @@ 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;
}
--
2.37.2
next prev parent reply other threads:[~2023-01-31 16:57 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-31 16:55 [PATCH 0/8] powerpc: improve copy_thread Nicholas Piggin
2023-01-31 16:55 ` Nicholas Piggin [this message]
2023-01-31 16:55 ` [PATCH 2/8] powerpc: copy_thread make ret_from_fork register setup consistent Nicholas Piggin
2023-01-31 16:55 ` [PATCH 3/8] powerpc: use switch frame for ret_from_kernel_thread parameters Nicholas Piggin
2023-01-31 16:55 ` [PATCH 4/8] powerpc/64: ret_from_fork avoid restoring regs twice Nicholas Piggin
2023-01-31 16:55 ` [PATCH 5/8] powerpc: copy_thread differentiate kthreads and user mode threads Nicholas Piggin
2023-01-31 16:55 ` [PATCH 6/8] powerpc: differentiate kthread from user kernel thread start Nicholas Piggin
2023-01-31 16:55 ` [PATCH 7/8] powerpc: copy_thread don't set _TIF_RESTOREALL Nicholas Piggin
2023-01-31 16:55 ` [PATCH 8/8] powerpc: copy_thread don't set ppr in user interrupt frame regs Nicholas Piggin
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