linux-kernel - Re: [PATCH 1/6] staging:android_pmem.h: Fixes the space and other formating issues pointed out by checkpatch.pl

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Date:	Fri, 20 Jan 2012 05:29:04 -0800
From:	Joe Perches <joe@...ches.com>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	Andy Whitcroft <apw@...onical.com>,
	Pradheep Shrinivasan <pradheep.sh@...il.com>, greg@...ah.com,
	devel@...uxdriverproject.org, swetland@...gle.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] staging:android_pmem.h: Fixes the space and other
 formating issues pointed out by checkpatch.pl

On Fri, 2012-01-20 at 14:54 +0300, Dan Carpenter wrote:
> It still complains about the following macros where parenthesis are
> not needed.
> 
> ERROR: Macros with complex values should be enclosed in parenthesis
> #156: FILE: staging/android/pmem.c:156:
> +#define PMEM_IS_FREE(id, index) !(pmem[id].bitmap[index].allocated)
> 
> Let's just make the check look for an operator with a low
> precedence.
> http://en.wikipedia.org/wiki/Order_of_operations#Programming_languages
> 
> Otherwise the submitters are going to change it to:
> 
> #define PMEM_IS_FREE(id, index) (!(pmem[id].bitmap[index].allocated))
> 
> That has two pairs of unneeded paranthesis and we run the risk of
> reprogramming the kernel in lisp, by mistake.

I think the outer parens are necessary.
Imagine PMEM_IS_FREE(foo, bar).another_dereference


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