linux-kernel - Re: [PATCH 3/5] lib: Add umoddi3 and udivmoddi4 of GCC library routines

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Message-ID: <mvmefdicabq.fsf@suse.de>
Date:   Tue, 25 Sep 2018 09:20:25 +0200
From:   Andreas Schwab <schwab@...e.de>
To:     Zong Li <zongbox@...il.com>
Cc:     hch@...radead.org, palmer@...ive.com, aou@...s.berkeley.edu,
        vincentc@...estech.com, zong@...estech.com,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/5] lib: Add umoddi3 and udivmoddi4 of GCC library routines

On Sep 25 2018, Zong Li <zongbox@...il.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@...e.de
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