linux-kernel - Re: [git pull] x86 fixes

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Message-ID: <20090112195438.GA4538@linux-os.sc.intel.com>
Date:	Mon, 12 Jan 2009 11:54:38 -0800
From:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	Torsten Kaiser <just.for.lkml@...glemail.com>,
	Ingo Molnar <mingo@...e.hu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [git pull] x86 fixes

On Mon, Jan 12, 2009 at 11:47:13AM -0800, Linus Torvalds wrote:
> 
> 
> On Mon, 12 Jan 2009, Pallipadi, Venkatesh wrote:
> > +		if (strict_prot ||
> > +		    (want_flags == _PAGE_CACHE_UC_MINUS &&
> > +		     flags == _PAGE_CACHE_WB) ||
> > +		    (want_flags == _PAGE_CACHE_WC &&
> > +		     flags == _PAGE_CACHE_WB)) {
> 
> Please don't write code like this.
> 
> Do it as an inline function that returns true/false and has comments on 
> what the hell is going on.
> 
> If a conditional doesn't fit on one line, it should generally be 
> abstracted away into a readable function where the name explains what it 
> does conceptually.
> 

Yes. The actual patch that is lined up in tip fixes indeed has this as a
macro sharing this code with 2 callers and comment about this
(is_new_memtype_allowed()). I wanted to keep the changes smaller in this
test patch, which is just to root cause this particular crash and ended
up with above code.

Thanks,
Venki
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