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csky: uprobes: Restore thread.trap_no
thread.trap_no is saved in arch_uprobe_pre_xol(), it should be restored in arch_uprobe_{post,abort}_xol() accordingly, otherwise the save operation is meaningless, this change is similar with x86 and powerpc. Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> Acked-by: Oleg Nesterov <oleg@redhat.com> Reviewed-by: Guo Ren <guoren@kernel.org> Signed-off-by: Guo Ren <guoren@kernel.org>
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@@ -64,6 +64,7 @@ int arch_uprobe_post_xol(struct arch_uprobe *auprobe, struct pt_regs *regs)
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struct uprobe_task *utask = current->utask;
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WARN_ON_ONCE(current->thread.trap_no != UPROBE_TRAP_NR);
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current->thread.trap_no = utask->autask.saved_trap_no;
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instruction_pointer_set(regs, utask->vaddr + auprobe->insn_size);
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@@ -101,6 +102,8 @@ void arch_uprobe_abort_xol(struct arch_uprobe *auprobe, struct pt_regs *regs)
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{
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struct uprobe_task *utask = current->utask;
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current->thread.trap_no = utask->autask.saved_trap_no;
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/*
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* Task has received a fatal signal, so reset back to probed
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* address.
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