linux-kernel - Re: [PATCH] scsi: virtio_scsi: Remove unnecessary condition checks

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Message-ID: <e87746e6-813e-7c0e-e21e-5921e759da5d@redhat.com>
Date:   Thu, 9 Jul 2020 19:25:47 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Markus Elfring <Markus.Elfring@....de>,
        Xianting Tian <xianting_tian@....com>,
        linux-scsi@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
        "James E. J. Bottomley" <jejb@...ux.ibm.com>,
        Jason Wang <jasowang@...hat.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Stefan Hajnoczi <stefanha@...hat.com>
Subject: Re: [PATCH] scsi: virtio_scsi: Remove unnecessary condition checks

On 09/07/20 19:16, Markus Elfring wrote:
>> +	mempool_destroy(virtscsi_cmd_pool);
>> +	virtscsi_cmd_pool = NULL;
>> +	kmem_cache_destroy(virtscsi_cmd_cache);
>> +	virtscsi_cmd_cache = NULL;
>>  	return ret;
>>  }
> 
> How do you think about to add a jump target so that the execution
> of a few statements can be avoided according to a previous
> null pointer check?

The point of the patch is precisely to simplify the code, executing a
couple more instruction is not an issue.

Paolo