linux-kernel - Re: [PATCH -next] evm: Use IS_ENABLED to initialize .enabled

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Date:   Tue, 21 Jun 2022 19:17:43 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     Mimi Zohar <zohar@...ux.ibm.com>
Cc:     xiujianfeng <xiujianfeng@...wei.com>,
        Ahmad Fatoum <a.fatoum@...gutronix.de>,
        dmitry.kasatkin@...il.com, jmorris@...ei.org, serge@...lyn.com,
        linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] evm: Use IS_ENABLED to initialize .enabled

On Tue, Jun 21, 2022 at 10:03:39AM -0400, Mimi Zohar wrote:
> On Tue, 2022-06-21 at 18:58 +0800, xiujianfeng wrote:
> > Hi, Ahmad
> > 
> > 在 2022/6/7 14:06, Ahmad Fatoum 写道:
> > > On 06.06.22 12:10, Xiu Jianfeng wrote:
> > >> Use IS_ENABLED(CONFIG_XXX) instead of #ifdef/#endif statements to
> > >> initialize .enabled, minor simplicity improvement.
> 
> The difference between using ifdef's and IS_ENABLED is when the
> decision is made - build time, run time.   Please update the patch
> description providing an explanation for needing to make the decision
> at run time.
> 
> thanks,

IS_ENABLED() is a compile time constant.  So the patch looks fine to me.

- Eric