linux-kernel - Re: [PATCH] SCSI: Remove redundant GFP

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Message-ID: <Pine.LNX.4.64.0705040426460.22990@localhost.localdomain>
Date:	Fri, 4 May 2007 04:29:37 -0400 (EDT)
From:	"Robert P. J. Day" <rpjday@...dspring.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-scsi@...r.kernel.org,
	James Bottomley <James.Bottomley@...eleye.com>
Subject: Re: [PATCH] SCSI: Remove redundant GFP_KERNEL type flag in kmalloc().

On Fri, 4 May 2007, Andrew Morton wrote:

>
> Please be careful to add the appropriate cc's.
>
> On Mon, 30 Apr 2007 04:37:22 -0400 (EDT) "Robert P. J. Day" <rpjday@...dspring.com> wrote:
>
> >
> > Remove the apparently redundant GFP_KERNEL type flag in the call to
> > kmalloc().
> >
> > Signed-off-by: Robert P. J. Day <rpjday@...dspring.com>
> >
> > ---
> >
> > diff --git a/drivers/scsi/aic7xxx_old.c b/drivers/scsi/aic7xxx_old.c
> > index a988d5a..765ded0 100644
> > --- a/drivers/scsi/aic7xxx_old.c
> > +++ b/drivers/scsi/aic7xxx_old.c
> > @@ -6581,7 +6581,7 @@ aic7xxx_slave_alloc(struct scsi_device *SDptr)
> >    struct aic7xxx_host *p = (struct aic7xxx_host *)SDptr->host->hostdata;
> >    struct aic_dev_data *aic_dev;
> >
> > -  aic_dev = kmalloc(sizeof(struct aic_dev_data), GFP_ATOMIC | GFP_KERNEL);
> > +  aic_dev = kmalloc(sizeof(struct aic_dev_data), GFP_ATOMIC);
>
> No, this converts the allocation from a robust one which can sleep into a
> flakey one which cannot.

... snip ...

at this point, i'd be happier to leave the appropriate patches in the
hands of those who have a better handle on this.  as i posted earlier,
there's only two examples of this in the entire tree:

drivers/scsi/aic7xxx_old.c:  aic_dev = kmalloc(sizeof(struct aic_dev_data), GFP_ATOMIC | GFP_KERNEL);
drivers/message/i2o/device.c:   resblk = kmalloc(buflen + 8, GFP_KERNEL | GFP_ATOMIC);

it's all yours.

rday
-- 
========================================================================
Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry
Waterloo, Ontario, CANADA

http://fsdev.net/wiki/index.php?title=Main_Page
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