From: Nicolas Pitre <nico@fluxnic.net>
To: Paul Walmsley <paul.walmsley@sifive.com>
Cc: linux-riscv@lists.infradead.org,
Palmer Dabbelt <palmer@sifive.com>,
Alan Kao <alankao@andestech.com>
Subject: Re: [PATCH] RISC-V: Remove udivdi3
Date: Tue, 6 Aug 2019 22:33:35 -0400 (EDT) [thread overview]
Message-ID: <nycvar.YSQ.7.76.1908062230570.19480@knanqh.ubzr> (raw)
In-Reply-To: <alpine.DEB.2.21.9999.1908061907340.25231@viisi.sifive.com>
On Tue, 6 Aug 2019, Paul Walmsley wrote:
> This patch breaks the rv32_defconfig build, since udelay() still relies on
> __udivdi3(). I'll queue "riscv: delay: use do_div() instead of
> __udivdi3()" along with it:
>
> https://lore.kernel.org/linux-riscv/alpine.DEB.2.21.9999.1908061906240.25231@viisi.sifive.com/T/#u
> + u64 n;
> + u32 rem;
>
> if (unlikely(usecs > MAX_UDELAY_US)) {
> - __delay((u64)usecs * riscv_timebase / 1000000ULL);
> + n = (u64)usecs * riscv_timebase;
> + rem = do_div(n, 1000000);
You may omit rem and ignore the return value here.
Nicolas
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next prev parent reply other threads:[~2019-08-07 2:33 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-07 0:05 [PATCH] RISC-V: Remove udivdi3 Palmer Dabbelt
2019-08-07 0:18 ` Alan Kao
2019-08-07 0:38 ` Paul Walmsley
2019-08-07 2:09 ` Paul Walmsley
2019-08-07 2:33 ` Nicolas Pitre [this message]
2019-08-07 2:40 ` Paul Walmsley
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