linux-kernel - Re: [PATCH 1/4] m68k/mac: More printk modernization

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Message-ID: <alpine.LNX.2.00.1710281242550.3@nippy.intranet>
Date:   Sat, 28 Oct 2017 13:04:25 +1100 (AEDT)
From:   Finn Thain <fthain@...egraphics.com.au>
To:     Kars de Jong <jongk@...ux-m68k.org>
cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        linux-m68k@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] m68k/mac: More printk modernization

On Sat, 28 Oct 2017, I wrote:

> > Any particular reason why you didn't use pr_debug() here? I'm guessing 
> > it's because this is not a known pointer value?
> > 
> 
> It's because the call to psc_debug_dump() is already conditional on 
> #ifdef DEBUG_PSC.
> 
> Having the printk conditional on both DEBUG and DEBUG_PSC would be 
> annoying. And I didn't want an unconditional call to psc_debug_dump() 
> because I think PSC_DEBUG could become more useful given that PSC 
> support is woefully incomplete.
> 

Perhaps PSC_DEBUG should be scrapped in favour of DEBUG. Presently 
DEBUG_PSC is set and I think that's useful as long as those drivers are 
incomplete. So we would end up with this:


#define DEBUG

#include ...
...

static void psc_debug_dump(void)
{
	...
	pr_debug(...);
	...
}

void __init psc_init(void)
{
	...
#if DEBUG
	psc_debug_dump()
#endif
	...
}


In this version, the "#define DEBUG" at the top of the file has obscure 
side effects (not just in printk.h) considering all of the headers that 
get included, and their includes, and so on. I still prefer the patch that 
I sent.

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