linux-kernel - Re: [PATCH v3] powerpc/setup_64: fix -Wempty-body warnings

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Date:   Mon, 15 Jul 2019 16:27:00 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Qian Cai <cai@....pw>
Cc:     paulus@...ba.org, benh@...nel.crashing.org,
        tyreld@...ux.vnet.ibm.com, joe@...ches.com,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Qian Cai <cai@....pw>
Subject: Re: [PATCH v3] powerpc/setup_64: fix -Wempty-body warnings

Qian Cai <cai@....pw> writes:
> At the beginning of setup_64.c, it has,
>
>   #ifdef DEBUG
>   #define DBG(fmt...) udbg_printf(fmt)
>   #else
>   #define DBG(fmt...)
>   #endif
>
> where DBG() could be compiled away, and generate warnings,
>
> arch/powerpc/kernel/setup_64.c: In function 'initialize_cache_info':
> arch/powerpc/kernel/setup_64.c:579:49: warning: suggest braces around
> empty body in an 'if' statement [-Wempty-body]
>     DBG("Argh, can't find dcache properties !\n");
>                                                  ^
> arch/powerpc/kernel/setup_64.c:582:49: warning: suggest braces around
> empty body in an 'if' statement [-Wempty-body]
>     DBG("Argh, can't find icache properties !\n");

Neither of those sites should use DBG(), that's not really early boot
code, they should just use pr_warn().

And the other uses of DBG() in initialize_cache_info() should just be
removed.

In smp_release_cpus() the entry/exit DBG's should just be removed, and
the spinning_secondaries line should just be pr_debug().

That would just leave the two calls in early_setup(). If we taught
udbg_printf() to return early when udbg_putc is NULL, then we could just
call udbg_printf() unconditionally and get rid of the DBG macro entirely.

cheers