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Date: Fri, 20 Apr 2018 03:41:26 -0700
From: Christoph Hellwig <hch@infradead.org>
To: Greentime Hu <green.hu@gmail.com>
Cc: linux-kernel@vger.kernel.org, arnd@arndb.de, greentime@andestech.com,
        private@roeck-us.net
Subject: Re: [PATCH 6/9] nds32: Fix the symbols undefined issue by exporting
 them.
Message-ID: <20180420104126.GA20680@infradead.org>
References: <347705ade75b5901537034561fd67311b1260358.1524143428.git.greentime@andestech.com>
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> +++ b/arch/nds32/kernel/stacktrace.c
> @@ -9,6 +9,7 @@ void save_stack_trace(struct stack_trace *trace)
>  {
>  	save_stack_trace_tsk(current, trace);
>  }
> +EXPORT_SYMBOL(save_stack_trace);

All other architectures use EXPORT_SYMBOL_GPL here.