linux-kernel - Re: [PATCH v5 2/2] mtd: rawnand: use bit-wise majority to recover the contents of ONFI parameter

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Date:   Mon, 14 May 2018 20:54:36 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Boris Brezillon <boris.brezillon@...tlin.com>
Cc:     Jane Wan <Jane.Wan@...ia.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Richard Weinberger <richard@....at>,
        Marek Vasut <marek.vasut@...il.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        prabhakar.kushwaha@....com, Shawn Guo <shawnguo@...nel.org>,
        jagdish.gediya@....com,
        Shreeya Patel <shreeya.patel23498@...il.com>,
        "open list:MEMORY TECHNOLOGY..." <linux-mtd@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ties.bos@...ia.com
Subject: Re: [PATCH v5 2/2] mtd: rawnand: use bit-wise majority to recover the
 contents of ONFI parameter

On Thu, May 10, 2018 at 3:03 PM, Boris Brezillon
<boris.brezillon@...tlin.com> wrote:

>> +#define GET_BIT(bit, val)   (((val) >> (bit)) & 0x01)
>
> Not sure we need that macro, see below.

+1. We have too many nice helpers for bit manipulations
(for_each_set_bit() as an example).


>                         for (k = 0; k < nbufs; k++) {
>                                 const u8 *srcbuf = srcbufs[j];
>
>                                 if (srcbuf[i] & BIT(k))
>                                         m++;
>                         }

...which is effectively hweightXX().

>> -     p = kzalloc(sizeof(*p), GFP_KERNEL);
>> +     p = kzalloc((sizeof(*p) * 3), GFP_KERNEL);
>>       if (!p)
>>               return -ENOMEM;

...which is kcalloc().


-- 
With Best Regards,
Andy Shevchenko