linux-kernel - Re: [PATCH v3 3/6] KVM: MMU: make return value of mmio page fault handler more readable

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Message-Id: <20130610221604.87fa64de18c9cb56eed0e013@gmail.com>
Date:	Mon, 10 Jun 2013 22:16:04 +0900
From:	Takuya Yoshikawa <takuya.yoshikawa@...il.com>
To:	Gleb Natapov <gleb@...hat.com>
Cc:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>,
	avi.kivity@...il.com, mtosatti@...hat.com, pbonzini@...hat.com,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH v3 3/6] KVM: MMU: make return value of mmio page fault
 handler more readable

On Mon, 10 Jun 2013 10:57:50 +0300
Gleb Natapov <gleb@...hat.com> wrote:

> On Fri, Jun 07, 2013 at 04:51:25PM +0800, Xiao Guangrong wrote:

> > +
> > +/*
> > + * Return values of handle_mmio_page_fault_common:
> > + * RET_MMIO_PF_EMULATE: it is a real mmio page fault, emulate the instruction
> > + *			 directly.
> > + * RET_MMIO_PF_RETRY: let CPU fault again on the address.
> > + * RET_MMIO_PF_BUG: bug is detected.
> > + */
> > +enum {
> > +	RET_MMIO_PF_EMULATE = 1,
> > +	RET_MMIO_PF_RETRY = 0,
> > +	RET_MMIO_PF_BUG = -1
> > +};
> I would order them from -1 to 1 and rename RET_MMIO_PF_BUG to
> RET_MMIO_PF_ERROR, but no need to resend just for that.

Why not just let compilers select the values? -- It's an enum.
Any reason to make it start from -1?

	Takuya
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