linux-kernel - Re: [PATCH v4] powerpc/setup_64: fix -Wempty-body warnings

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Date:   Wed, 30 Oct 2019 23:14:14 +1100 (AEDT)
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Qian Cai <cai@....pw>
Cc:     linux-kernel@...r.kernel.org, paulus@...ba.org,
        tyreld@...ux.vnet.ibm.com, joe@...ches.com, Qian Cai <cai@....pw>,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v4] powerpc/setup_64: fix -Wempty-body warnings

On Mon, 2019-07-15 at 18:32:32 UTC, Qian Cai wrote:
> 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");
> 
> Fix it by using the suggestions from Michael:
> 
> "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."
> 
> Suggested-by: Michael Ellerman <mpe@...erman.id.au>
> Signed-off-by: Qian Cai <cai@....pw>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/3b9176e9a874a848afa7eb2f6943639eb18b7a17

cheers