linux-kernel - Re: [PATCH 2/2] m68k: introduce a virtual m68k machine

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Message-Id: <F9FB9B1D-3B31-452D-AD67-D1C57A302B83@gmail.com>
Date:   Wed, 28 Apr 2021 19:06:10 -0400
From:   Josh Juran <jjuran@...il.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Laurent Vivier <laurent@...ier.eu>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        linux-rtc@...r.kernel.org, Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>
Subject: Re: [PATCH 2/2] m68k: introduce a virtual m68k machine

On Apr 28, 2021, at 8:04 AM, Geert Uytterhoeven <geert@...ux-m68k.org> wrote:

> This can be simplified by shifting irq_pending instead of irq_bit:
> 
>    do {
>            if (irq_pending & 1)
>                    generic_handle_irq(irq_num);
> 
>            ++irq_num;
>            irq_pending >>= 1;
>    } while (irq_pending);
> 
> Unfortunately m68k doesn't have a single-instruction __ffs().

The 68000 and 68010 don't, but couldn't the 68020's BFFFO do the job?

Josh