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[Xen-devel] I have used printk in some hypercall.But Dom0 can't be booted.

Hi all:
    I wanted to record some information about some hypercalls and trace the
hypercalls.So I have tried to add printk in the hypercall.But the Dom0 can't
be *booted*.For example, I add printk at the beginning of do_set_trap_table.
Why I can't add printk in hypercall?
Does anyone know the reason and the solution?Thanks.

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