linux-kernel - Re: [PATCH] This patch to profile.c fixes a few errors reported by checkpatch.pl

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Date:	Fri, 4 Jan 2008 14:18:17 +0100
From:	"Paolo Ciarrocchi" <paolo.ciarrocchi@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"Linux Kernel" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] This patch to profile.c fixes a few errors reported by checkpatch.pl

On Jan 4, 2008 2:07 PM, Ingo Molnar <mingo@...e.hu> wrote:
[...]
> > That said, the errors reported by checkpatch.pl are now:
> > paolo@...lo-desktop:~/linux-2.6/kernel$ ../scripts/checkpatch.pl
> > --terse --file profile.c |grep ERROR
> > profile.c:128: ERROR: "foo * bar" should be "foo *bar"
> > I just forgot to fix it, very trivial. Will do in a minute.
> >
> > profile.c:460: ERROR: do not use assignment in if condition (+  if
> > (!(entry = create_proc_entry("XXXXXXXXXXXXX", 0600, root_irq_dir))))
> > profile.c:594: ERROR: do not use assignment in if condition (+  if
> > (!(entry = create_proc_entry("XXXXXXX", S_IWUSR | S_IRUGO, NULL))))
> > Here I need an hint ( or an example) about how to fix these two errors :-)
>
> transform:
>
>   if (!(x = y))
>
> to:
>
>   x = y
>   if (!x)
>
> i.e. take the implicit assignment out of the condition. (it's easy to
> mistake it for '==' while reviewing the code and forgetting about the
> assignment's side-effect)

OK, thanks.

Is the following correct?

Before:
 if (!(entry = create_proc_entry("prof_cpu_mask", 0600, root_irq_dir)))

After:
entry = create_proc_entry("prof_cpu_mask", 0600, root_irq_dir)
if (!entry)

BTW, how can i compile only the profile.c file?
I would like to verify that my changes (now I'm at total: 2 errors, 1
warnings, 599 lines checked)
doesn't impact on the compiled code?

Thanks.

Ciao,
-- 
Paolo
http://paolo.ciarrocchi.googlepages.com/
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