linux-kernel - Re: [PATCH] scsi: Use vzalloc instead of vmalloc/memset

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Message-ID: <20171107210046.GA3948@himanshu-Vostro-3559>
Date:   Wed, 8 Nov 2017 02:30:46 +0530
From:   Himanshu Jha <himanshujha199640@...il.com>
To:     "Luis R. Rodriguez" <mcgrof@...nel.org>
Cc:     anil.gurumurthy@...gic.com, sudarsana.kalluru@...gic.com,
        jejb@...ux.vnet.ibm.com, martin.petersen@...cle.com,
        qla2xxx-upstream@...gic.com, kartilak@...co.com,
        sebaddel@...co.com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, Julia Lawall <julia.lawall@...6.fr>
Subject: Re: [PATCH] scsi: Use vzalloc instead of vmalloc/memset

On Tue, Nov 07, 2017 at 08:51:36PM +0100, Luis R. Rodriguez wrote:
> On Sun, Nov 05, 2017 at 03:26:26AM +0530, Himanshu Jha wrote:
> > Use vzalloc instead of vmalloc/memset to allocate memory filled with 0
> > value.
> > 
> > Done using Coccinelle.
> > Semantic patch used :
> > 
> > @@
> > expression x,a;
> > statement S;
> > @@
> > 
> > - x = vmalloc(a);
> > + x = vzalloc(a);
> >   if (x == NULL || ...) S
> > - memset(x, 0, a);
> 
> How many false positives do you get? Have you identified any?
> If not you should consider adding this SmPL rule to:
> 
> scripts/coccinelle/api/
> 
> Some maintainers may ask you for the SmPL rule to be upstream first,
> not all though. So its good practice for you to strive for this.
> Another reason for it to go upstream is then other maintainers
> can / should be running coccicheck against their subsystem to avoid
> stupid regressions.
> 
> You may want to explain for patches like these that they have been
> tested by 0-day without any issues found.
> 
> Also add the tag:
> 
> Generated-by: Coccinelle SmPL
> 
> > Signed-off-by: Himanshu Jha <himanshujha199640@...il.com>
> > ---
> >  drivers/scsi/bfa/bfad.c            | 3 +--
> >  drivers/scsi/bfa/bfad_debugfs.c    | 8 ++------
> >  drivers/scsi/qla2xxx/qla_bsg.c     | 3 +--
> >  drivers/scsi/qla2xxx/tcm_qla2xxx.c | 5 +----
> >  drivers/scsi/scsi_debug.c          | 6 ++----
> >  drivers/scsi/snic/snic_trc.c       | 3 +--
> >  6 files changed, 8 insertions(+), 20 deletions(-)
> 
> Split this up per driver, and resend by using ./scripts/get_maintainer.pl
> foo.patch and ensuring the right folks get the email.  Right now you 
> just spammed tons of people and the changes may be preferred to go
> upstream atomically per driver, always assume this first.
> 
> Other than this, feel free to add to each of the patches you created:
> 

Thanks for the feeedback! I will resend the patch with the necessary
changes.

> Acked-by: Luis R. Rodriguez <mcgrof@...nel.org>


Thanks
Himanshu Jha