linux-kernel - Re: [PATCH] KEYS: trusted: fix -Wvarags warning

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Date:   Fri, 12 Oct 2018 10:13:56 -0500
From:   Denis Kenzior <denkenz@...il.com>
To:     James Bottomley <jejb@...ux.ibm.com>, ndesaulniers@...gle.com,
        dhowells@...hat.com
Cc:     natechancellor@...il.com, ebiggers@...gle.com,
        Mimi Zohar <zohar@...ux.vnet.ibm.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        linux-integrity@...r.kernel.org, keyrings@...r.kernel.org,
        linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KEYS: trusted: fix -Wvarags warning

Hi James,

>> So can't we simply use 'bool' or uint32 as the type for h3 instead
>> of re-ordering everything
> 
> The problem is the standard is ambiguious.  The only thing that's
> guaranteed to work for all time is a char *.  If you want to keep the
> order, what I'd suggest is inserting a dummy pointer argument which is
> always expected to be NULL between the h3 and the varargs.

So maybe I'm misunderstanding something, but the issue seems to be that 
unsigned char is promoted to 'unsigned char *' by Clang and probably 
unsigned int or int by gcc.

So instead of having unsigned char h3, can't we simply have bool h3 or 
unsigned int h3?

Regards,
-Denis