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Message-ID: <8638183f559c0f8f8d377bd0a6c91903b2c588df.camel@perches.com>
Subject: Re: [PATCH] scsi: libcxgbi: use kvzalloc instead of opencoded
 kzalloc/vzalloc
From:   Joe Perches <joe@perches.com>
To:     Denis Efremov <efremov@linux.com>,
        "Martin K. Petersen" <martin.petersen@oracle.com>,
        "James E.J. Bottomley" <jejb@linux.ibm.com>
Cc:     linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org
Date:   Fri, 31 Jul 2020 15:24:33 -0700
In-Reply-To: <70fb8220-2102-adb5-bbe6-9c2ea74a0623@linux.com>
References: <20200731215524.14295-1-efremov@linux.com>
         <33d943d2b83f17371df09b5962c856ea2d894954.camel@perches.com>
         <70fb8220-2102-adb5-bbe6-9c2ea74a0623@linux.com>
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On Sat, 2020-08-01 at 01:10 +0300, Denis Efremov wrote:
> 
> On 8/1/20 12:58 AM, Joe Perches wrote:
> > On Sat, 2020-08-01 at 00:55 +0300, Denis Efremov wrote:
> > > Remove cxgbi_alloc_big_mem(), cxgbi_free_big_mem() functions
> > > and use kvzalloc/kvfree instead.
> > 
> > Sensible, thanks.
> > 
> > > diff --git a/drivers/scsi/cxgbi/libcxgbi.c b/drivers/scsi/cxgbi/libcxgbi.c
> > []
> > > @@ -77,9 +77,9 @@ int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
> > >  {
> > >  	struct cxgbi_ports_map *pmap = &cdev->pmap;
> > >  
> > > -	pmap->port_csk = cxgbi_alloc_big_mem(max_conn *
> > > -					     sizeof(struct cxgbi_sock *),
> > > -					     GFP_KERNEL);
> > > +	pmap->port_csk = kvzalloc(array_size(max_conn,
> > > +					     sizeof(struct cxgbi_sock *)),
> > > +				  GFP_KERNEL);
> > 
> > missing __GFP_NOWARN
> > 
> 
> kvmalloc_node adds __GFP_NOWARN internally to kmalloc call
> https://elixir.bootlin.com/linux/v5.8-rc4/source/mm/util.c#L568

Only when there's a fallback, and the fallback does not.