linux-kernel - Re: [PATCH] ib_srp: Let compiler ignore the useless debug code

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Date:   Fri, 24 Feb 2017 16:16:31 +0000
From:   Bart Van Assche <Bart.VanAssche@...disk.com>
To:     "hal.rosenstock@...il.com" <hal.rosenstock@...il.com>,
        "mnghuan@...il.com" <mnghuan@...il.com>,
        "dledford@...hat.com" <dledford@...hat.com>,
        "sean.hefty@...el.com" <sean.hefty@...el.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>
Subject: Re: [PATCH] ib_srp: Let compiler ignore the useless debug code

On Fri, 2017-02-24 at 16:44 +0800, Minfei Huang wrote:
> "if (0)" is used to make this block of debug code not be executed. There
> is a more elegant way to let compiler ignore this code, using
> "#if 0 .. #endif" instead.
> 
> Although it may be optimised by some compilers with specified parameter,
> just for readable.

#if 0 / #endif prevents the compiler from checking the syntax of the code.
Such code tends to grow syntax errors. So I'm not sure this patch is an
improvement.

Bart.