Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
From:   Andreas Schwab <schwab@suse.de>
To:     Zong Li <zongbox@gmail.com>
Cc:     hch@infradead.org, palmer@sifive.com, aou@eecs.berkeley.edu,
        vincentc@andestech.com, zong@andestech.com,
        linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 3/5] lib: Add umoddi3 and udivmoddi4 of GCC library routines
References: <cover.1537260207.git.zongbox@gmail.com>
        <2ccc6c0758624dbb22f6fe451a3e476a000108ef.1537260207.git.zongbox@gmail.com>
        <20180921070006.GC8401@infradead.org>
        <CA+ZOyaiJv-NZWk3ec_3zhRTSn7G-NGgyaiPTXOmuWfTWD7KSJw@mail.gmail.com>
Date:   Tue, 25 Sep 2018 09:20:25 +0200
In-Reply-To: <CA+ZOyaiJv-NZWk3ec_3zhRTSn7G-NGgyaiPTXOmuWfTWD7KSJw@mail.gmail.com>
        (Zong Li's message of "Tue, 25 Sep 2018 10:19:55 +0800")
Message-ID: <mvmefdicabq.fsf@suse.de>
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux)
MIME-Version: 1.0
Content-Type: text/plain
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Sep 25 2018, Zong Li <zongbox@gmail.com> wrote:

> The RV32 need the umoddi3 to do modulo when the operands are long long
> type, like other libraries implementation such as ucmpdi2, lshrdi3 and
> so on. I encounter the undefined reference 'umoddi3' when I use the in
> house dma driver, although it is in house driver, but I think that
> umoddi3 is a common function for RV32.

You probably should use the macros from <asm/div64.h> instead.

Andreas.

-- 
Andreas Schwab, SUSE Labs, schwab@suse.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE  1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."