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powerpc: copy_thread make ret_from_fork register setup consistent

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The ret_from_fork code for 64e and 32-bit set r3 for
syscall_exit_prepare the same way that 64s does, so there should
be no need to special-case them in copy_thread.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230325122904.2375060-3-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin
2023-03-25 22:28:58 +10:00
committed by Michael Ellerman
parent c013e9f2bb
commit 959791e45f
2 changed files with 1 additions and 4 deletions
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3
arch/powerpc/kernel/process.c
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@@ -1784,9 +1784,6 @@ int copy_thread(struct task_struct *p, const struct kernel_clone_args *args)
childregs->gpr[1] = usp;
((unsigned long *)sp)[0] = childregs->gpr[1];
p->thread.regs = childregs;
/* 64s sets this in ret_from_fork */
if (!IS_ENABLED(CONFIG_PPC_BOOK3S_64))
childregs->gpr[3] = 0; /* Result from fork() */
if (clone_flags & CLONE_SETTLS) {
if (!is_32bit_task())
childregs->gpr[13] = tls;