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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
Subject: Re: [PATCH] scsi: libcxgbi: use kvzalloc instead of opencoded kzalloc/vzalloc
Date: Sat, 01 Aug 2020 01:10:28 -0700
Message-ID: <0c1803c6aaca42579b7933fd219e4e208ab7524f.camel@perches.com> (raw)
In-Reply-To: <c5a18804-3236-9688-2a3c-68184f0dd9e8@linux.com>

On Sat, 2020-08-01 at 10:51 +0300, Denis Efremov wrote:
> On 8/1/20 1:24 AM, Joe Perches wrote:
> > 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.
> Sorry, Joe, I don't understand why do we need to add __GFP_NOWARN here.

Hi.

The reason to add __GFP_NOWARN is so you don't get a
dump_stack() as there's an existing error message
output below this when OOM.

You should either remove the error message as it just
effectively duplicates the dump_stack or add __GFP_NOWARN.

Your choice.

cheers, Joe


  parent reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-31 21:55 Denis Efremov
2020-07-31 21:58 ` Joe Perches
2020-07-31 22:10   ` Denis Efremov
2020-07-31 22:24     ` Joe Perches
2020-08-01  7:51       ` Denis Efremov
2020-08-01  7:58         ` Denis Efremov
2020-08-01  8:10         ` Joe Perches [this message]
2020-08-01 13:28           ` Denis Efremov
2020-08-01 13:31 ` [PATCH v2] " Denis Efremov

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