linux-kernel - Re: [PATCH] sparc: make proces_ver

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Date:	Mon, 5 Jan 2009 14:46:19 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Sam Ravnborg <sam@...nborg.org>
cc:	LKML <linux-kernel@...r.kernel.org>,
	Steven Rostedt <srostedt@...hat.com>,
	Ingo Molnar <mingo@...e.hu>,
	"David S. Miller" <davem@...emloft.net>,
	sparclinux <sparclinux@...r.kernel.org>
Subject: Re: [PATCH] sparc: make proces_ver_nack a bit more readable


On Mon, 5 Jan 2009, Steven Rostedt wrote:

> 
> Impact: clean up
> 
> The code in process_ver_nack is a little obfuscated. This change
> makes it a bit more readable by humans. It removes the complex
> if statement and replaces it with a cleaner flow of control.

Note, I do not have a sparc compiler at my disposal, so I was not
able to compile (or boot) test this change.

Here's the original code:

static int process_ver_nack(struct ldc_channel *lp, struct ldc_version 
*vp)
{
        struct ldc_version *vap;

        if ((vp->major == 0 && vp->minor == 0) ||
            !(vap = find_by_major(vp->major))) {
                return ldc_abort(lp);
        } else {
                struct ldc_packet *p;
                unsigned long new_tail;

                p = handshake_compose_ctrl(lp, LDC_INFO, LDC_VERS,
                                           vap, sizeof(*vap),
                                           &new_tail);
                if (p)
                        return send_tx_packet(lp, p, new_tail);
                else
                        return ldc_abort(lp);
        }
}


And the new code:

static int process_ver_nack(struct ldc_channel *lp, struct ldc_version 
*vp)
{
        struct ldc_version *vap;
        struct ldc_packet *p;
        unsigned long new_tail;

        if (vp->major == 0 && vp->minor == 0)
                return ldc_abort(lp);

        vap = find_by_major(vp->major);
        if (!vap)
                return ldc_abort(lp);

        p = handshake_compose_ctrl(lp, LDC_INFO, LDC_VERS,
                                           vap, sizeof(*vap),
                                           &new_tail);
        if (!p)
                return ldc_abort(lp);

        return send_tx_packet(lp, p, new_tail);
}

This should be binary the same. But as I said, I do not have a sparc 
compiler to test.

Thanks,

-- Steve
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