linux-kernel - Re: [PATCH] x86/UV: Fix conditional in gru

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Date:	Mon, 31 Mar 2014 09:25:05 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Dimitri Sivanich <sivanich@....com>
Cc:	linux-kernel@...r.kernel.org, x86@...nel.org,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH] x86/UV: Fix conditional in gru_exit


* Dimitri Sivanich <sivanich@....com> wrote:

> On Fri, Mar 21, 2014 at 08:55:49AM +0100, Ingo Molnar wrote:
> > > -	if (!is_uv_system())
> > > +	if (!is_uv_system() || (is_uvx_hub() && !is_uv2_hub()))
> > >  		return;
> > 
> > Such an amalgation of three system specific conditionals is 
> > disgusting, please at minimum factor out a helper routine so that such 
> > mismatches cannot happen.
> >
> Agreed.  Here's a new patch.
> 
> 
> Fix supported system conditional in gru_exit.
> 
> Signed-off-by: Dimitri Sivanich <sivanich@....com>
> ---
>  drivers/misc/sgi-gru/grufile.c |    8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> Index: linux/drivers/misc/sgi-gru/grufile.c
> ===================================================================
> --- linux.orig/drivers/misc/sgi-gru/grufile.c
> +++ linux/drivers/misc/sgi-gru/grufile.c
> @@ -58,6 +58,10 @@ static int max_user_cbrs, max_user_dsr_b
>  
>  static struct miscdevice gru_miscdev;
>  
> +static int gru_unsupported(void)
> +{
> +	return !is_uv_system() || (is_uvx_hub() && !is_uv2_hub());
> +}

So the usual pattern is to introduce simple patterns, without logic 
operations in their name. I.e. "gru_supported()" would be more natural 
than "gru_not_supported()" or gru_unsupported()".

Thanks,

	Ingo
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