linux-kernel - Re: [PATCH] [RESEND v4] printf: fix errname.c list

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Date:   Tue, 7 Feb 2023 10:51:32 +0900
From:   Sergey Senozhatsky <senozhatsky@...omium.org>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Petr Mladek <pmladek@...e.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Uwe Kleine-König <uwe@...ine-koenig.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        John Ogness <john.ogness@...utronix.de>,
        Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [RESEND v4] printf: fix errname.c list

On (23/02/06 20:40), Arnd Bergmann wrote:
> On most architectures, gcc -Wextra warns about the list of error
> numbers containing both EDEADLK and EDEADLOCK:
> 
> lib/errname.c:15:67: warning: initialized field overwritten [-Woverride-init]
>    15 | #define E(err) [err + BUILD_BUG_ON_ZERO(err <= 0 || err > 300)] = "-" #err
>       |                                                                   ^~~
> lib/errname.c:172:2: note: in expansion of macro 'E'
>   172 |  E(EDEADLK), /* EDEADLOCK */
>       |  ^
> 
> On parisc, a similar error happens with -ECANCELLED, which is an
> alias for ECANCELED.
> 
> Make the EDEADLK printing conditional on the number being distinct
> from EDEADLOCK, and remove the -ECANCELLED bit completely as it
> can never be hit.
> 
> To ensure these are correct, add static_assert lines that verify
> all the remaining aliases are in fact identical to the canonical
> name.
> 

Reviewed-by: Sergey Senozhatsky <senozhatsky@...omium.org>