linux-kernel - Re: [possible PATCH] crypto: sahara - Use #ifdef DEBUG not IS

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Message-ID: <CAKv+Gu_SBkhV8SVXpOBDoPRBJYhFdmF3jJdZ5OPm3SrPBTSarQ@mail.gmail.com>
Date:   Fri, 22 Mar 2019 15:29:59 +0100
From:   Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     Joe Perches <joe@...ches.com>,
        "David S. Miller" <davem@...emloft.net>,
        "open list:HARDWARE RANDOM NUMBER GENERATOR CORE" 
        <linux-crypto@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [possible PATCH] crypto: sahara - Use #ifdef DEBUG not IS_ENABLED(DEBUG)

On Fri, 22 Mar 2019 at 13:43, Herbert Xu <herbert@...dor.apana.org.au> wrote:
>
> On Thu, Mar 07, 2019 at 04:15:55PM -0800, Joe Perches wrote:
> > Normal use of IS_ENABLED is with a CONFIG_<SYMBOL> and
> > there is no -DDEBUG in the Makefile here.
> >
> > Replace the IS_ENABLED(DEBUG) with #ifdef DEBUG/#endif
> > blocks.
> >
> > Miscellanea:
> >
> > o Move the sahara_state array into the function that uses it.
> >
> > Signed-off-by: Joe Perches <joe@...ches.com>
> > ---
> >  drivers/crypto/sahara.c | 20 +++++++++-----------
> >  1 file changed, 9 insertions(+), 11 deletions(-)
>
> Even if this is correct this is way too ugly.  The original code
> at least compiled everything regardless of macros.  Your new code
> won't detect compile errors in debugging code unless debugging is
> enabled.
>

What's wrong with IS_ENABLED(DEBUG) anyway? It may not be 'normal use'
but it works fine.