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Date:   Thu, 17 Sep 2020 20:33:46 +0300
From:   Leon Romanovsky <leon@kernel.org>
To:     Jason Gunthorpe <jgg@ziepe.ca>
Cc:     Liu Shixin <liushixin2@huawei.com>,
        Doug Ledford <dledford@redhat.com>, linux-rdma@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH -next] RDMA/mlx5: fix type warning of sizeof in
 __mlx5_ib_alloc_counters()
Message-ID: <20200917173346.GK869610@unreal>
References: <20200917082926.GA869610@unreal>
 <20200917091008.2309158-1-liushixin2@huawei.com>
 <20200917090810.GB869610@unreal>
 <20200917123806.GA114613@nvidia.com>
 <20200917170511.GI869610@unreal>
 <20200917172451.GK8409@ziepe.ca>
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On Thu, Sep 17, 2020 at 02:24:51PM -0300, Jason Gunthorpe wrote:
> On Thu, Sep 17, 2020 at 08:05:11PM +0300, Leon Romanovsky wrote:
> > On Thu, Sep 17, 2020 at 09:38:06AM -0300, Jason Gunthorpe wrote:
> > > On Thu, Sep 17, 2020 at 12:08:10PM +0300, Leon Romanovsky wrote:
> > > > On Thu, Sep 17, 2020 at 05:10:08PM +0800, Liu Shixin wrote:
> > > > > sizeof() when applied to a pointer typed expression should give the
> > > > > size of the pointed data, even if the data is a pointer.
> > > > >
> > > > > Signed-off-by: Liu Shixin <liushixin2@huawei.com>
> > >
> > > Needs a fixes line
> > >
> > > > >  	if (!cnts->names)
> > > > >  		return -ENOMEM;
> > > > >
> > > > >  	cnts->offsets = kcalloc(num_counters,
> > > > > -				sizeof(cnts->offsets), GFP_KERNEL);
> > > > > +				sizeof(*cnts->offsets), GFP_KERNEL);
> > > >
> > > > This is not.
> > >
> > > Why not?
> >
> > cnts->offsets is array of pointers that we will set later.
> > The "sizeof(*cnts->offsets)" will return the size of size_t, while we
> > need to get "size_t *".
>
> Then why isn't a pointer to size **?
>
> Something is rotten here

No problem, I'll check.

>
> Jason