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

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Date:   Wed, 26 Sep 2018 15:12:45 +0800
From:   Zong Li <zongbox@...il.com>
To:     schwab@...e.de
Cc:     hch@...radead.org, Palmer Dabbelt <palmer@...ive.com>,
        aou@...s.berkeley.edu, Vincent Chen <vincentc@...estech.com>,
        Zong Li <zong@...estech.com>, linux-riscv@...ts.infradead.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/5] lib: Add umoddi3 and udivmoddi4 of GCC library routines

Andreas Schwab <schwab@...e.de> 於 2018年9月25日 週二 下午3:20寫道：
>
> 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.

Hi Andreas,

This doesn't work for me, the divisor of my case is also long long type.