linux-kernel - Re: [PATCH 3/5] powerpc-pseries: Delete an unnecessary variable initialisation in iommu_pseries_alloc

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Date:   Thu, 19 Oct 2017 13:49:17 +0200
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     Michal Suchánek <msuchanek@...e.de>,
        linuxppc-dev@...ts.ozlabs.org
Cc:     Alex Williamson <alex.williamson@...hat.com>,
        Alexey Kardashevskiy <aik@...abs.ru>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Bart Van Assche <bart.vanassche@...disk.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        David Gibson <david@...son.dropbear.id.au>,
        Doug Ledford <dledford@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Johan Hovold <johan@...nel.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nathan Fontenot <nfont@...ux.vnet.ibm.com>,
        Paul Mackerras <paulus@...ba.org>,
        Rob Herring <robh@...nel.org>,
        Sahil Mehta <sahilmehta17@...il.com>,
        Tyrel Datwyler <tyreld@...ux.vnet.ibm.com>,
        kernel-janitors@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/5] powerpc-pseries: Delete an unnecessary variable
 initialisation in iommu_pseries_alloc_group()

>>  static struct iommu_table_group *iommu_pseries_alloc_group(int node)
>>  {
>> -	struct iommu_table_group *table_group = NULL;
>> +	struct iommu_table_group *table_group;
>>  	struct iommu_table *tbl = NULL;
>>  	struct iommu_table_group_link *tgl = NULL;
>>  
> 
> I think initializing pointers to NULL is generally a good idea.

This one would also not be needed if the call of the function “kzalloc_node”
could be specified in the same statement.


> Removing these initializers adds no value, to the contrary.

This small update step is just a “preparation” for the subsequent two suggestions
in this patch series.

Regards,
Markus