linux-kernel - Re: [PATCH] net: thunderx: rework mac addresses list to u64 array

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Message-ID: <20180405161534.GA18042@infradead.org>
Date:   Thu, 5 Apr 2018 09:15:34 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Vadim Lomovtsev <Vadim.Lomovtsev@...iumnetworks.com>
Cc:     Christoph Hellwig <hch@...radead.org>, sgoutham@...ium.com,
        sunil.kovvuri@...il.com, rric@...nel.org,
        linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, davem@...emloft.net,
        dnelson@...hat.com, gustavo@...eddedor.com,
        Vadim Lomovtsev <Vadim.Lomovtsev@...ium.com>
Subject: Re: [PATCH] net: thunderx: rework mac addresses list to u64 array

On Thu, Apr 05, 2018 at 09:07:49AM -0700, Vadim Lomovtsev wrote:
> > 
> > > +				mc_list = kmalloc(sizeof(*mc_list) +
> > > +						  sizeof(u64) * netdev_mc_count(netdev),
> > > +						  GFP_ATOMIC);
> > 
> > kmalloc_array(), please.
> 
> In this case it would require two memory allocation calls to kmalloc() for
> xcast_addr_list struct and to kmalloc_array() for 'mc' addresses, becasue of
> different data types and so two null-ptr checks .. this is what I'd like get rid off.
> 
> My idea of this was to keep number of array elements and themselves within the
> same memory block/page to reduce number of memory allocation requests, number
> of allocated pages/blocks and avoid possible memory fragmentation (however, I believe
> the latter is already handled at the mm layer).

Indeed, lets keep it as-is.