linux-kernel - Re: [PATCH 5/9] RISC-V: implement low-level interrupt handling

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Message-ID: <20180802095911.GA14841@lst.de>
Date:   Thu, 2 Aug 2018 11:59:11 +0200
From:   Christoph Hellwig <hch@....de>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Christoph Hellwig <hch@....de>, palmer@...ive.com,
        jason@...edaemon.net, marc.zyngier@....com, robh+dt@...nel.org,
        mark.rutland@....com, anup@...infault.org, atish.patra@....com,
        devicetree@...r.kernel.org, aou@...s.berkeley.edu,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        shorne@...il.com
Subject: Re: [PATCH 5/9] RISC-V: implement low-level interrupt handling

On Thu, Aug 02, 2018 at 11:48:55AM +0200, Thomas Gleixner wrote:
> > diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S
> > index 9aaf6c986771..fa2c08e3c05e 100644
> > --- a/arch/riscv/kernel/entry.S
> > +++ b/arch/riscv/kernel/entry.S
> > @@ -168,8 +168,8 @@ ENTRY(handle_exception)
> >  
> >  	/* Handle interrupts */
> >  	move a0, sp /* pt_regs */
> > -	REG_L a1, handle_arch_irq
> > -	jr a1
> > +	move a1, s4 /* scause */
> > +	tail do_IRQ
> 
> What's the reason for doing the whole exception dance in ASM ?

I'll let Palmer defend it.  But for now I just want minimal changes
to actually get a booting system..