linux-kernel - Re: [PATCH v6 07/12] x86/cpu/keylocker: Load an internal wrapping key at boot-time

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Date:   Mon, 8 May 2023 17:51:41 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     "Chang S. Bae" <chang.seok.bae@...el.com>,
        Eric Biggers <ebiggers@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        dm-devel@...hat.com, gmazyland@...il.com, luto@...nel.org,
        dave.hansen@...ux.intel.com, tglx@...utronix.de, mingo@...nel.org,
        x86@...nel.org, herbert@...dor.apana.org.au, ardb@...nel.org,
        dan.j.williams@...el.com, bernie.keany@...el.com,
        charishma1.gairuboyina@...el.com,
        lalithambika.krishnakumar@...el.com,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH v6 07/12] x86/cpu/keylocker: Load an internal wrapping key
 at boot-time

On 5/8/23 17:31, Chang S. Bae wrote:
>> With the macro, they'll get no type warning.  The inline actually makes
>> it easier to find bugs because folks will get _some_ type checking no
>> matter how they compile the code.
> 
> Ah, when the prototype with one or more arguments, 'static inline'
> allows the check. Then it is not an 'either-way' thing.
> 
> Looking at the x86 code, there are some seemingly related:
> 
> $ git grep "do { } while (0)" arch/x86 | grep -v "()"
...

Right.  It's not a hard and fast rule.  We certainly take code either
way and there can be real reasons to do it one way versus the other.