linux-kernel - Re: [PATCH 24/34] crypto: ccp

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Date: Wed, 03 Apr 2024 17:50:23 +0200
From: "Arnd Bergmann" <arnd@...db.de>
To: "Tom Lendacky" <thomas.lendacky@....com>,
 "Arnd Bergmann" <arnd@...nel.org>, linux-kernel@...r.kernel.org,
 "John Allen" <john.allen@....com>,
 "Herbert Xu" <herbert@...dor.apana.org.au>,
 "David S . Miller" <davem@...emloft.net>
Cc: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
 linux-crypto@...r.kernel.org
Subject: Re: [PATCH 24/34] crypto: ccp - drop platform ifdef checks

On Wed, Apr 3, 2024, at 17:17, Tom Lendacky wrote:
> On 4/3/24 03:06, Arnd Bergmann wrote:
>> From: Arnd Bergmann <arnd@...db.de>
>> 
>> When both ACPI and OF are disabled, the dev_vdata variable is unused:
>> 
>> drivers/crypto/ccp/sp-platform.c:33:34: error: unused variable 'dev_vdata' [-Werror,-Wunused-const-variable]
>> 
>> This is not a useful configuration, and there is not much point in saving
>> a few bytes when only one of the two is enabled, so just remove all
>> these ifdef checks and rely on of_match_node() and acpi_match_device()
>> returning NULL when these subsystems are disabled.
>> 
>> Fixes: 6c5063434098 ("crypto: ccp - Add ACPI support")
>> Signed-off-by: Arnd Bergmann <arnd@...db.de>
>
> Would using __maybe_unused on dev_vdata be the safer, easier choice?

It's a simpler change, but leaves the extra complexity that
is not needed here.

      Arnd