linux-kernel - Re: [PATCH] bitops: Introduce BITS_PER

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Message-Id: <20180706145753.b186b0b22d9c55744b77f385@linux-foundation.org>
Date:   Fri, 6 Jul 2018 14:57:53 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Chris Wilson <chris@...is-wilson.co.uk>
Cc:     linux-kernel@...r.kernel.org,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Andy Gospodarek <gospo@...adcom.com>,
        "David S . Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH] bitops: Introduce BITS_PER_TYPE

On Fri,  6 Jul 2018 10:44:58 +0100 Chris Wilson <chris@...is-wilson.co.uk> wrote:

> net_dim.h has a rather useful extension to BITS_PER_BYTE to compute the
> number of bits in a type (BITS_PER_BYTE * sizeof(T)), so promote the
> macro to bitops.h, alongside BITS_PER_BYTE, for wider usage.

A bit of grepping shows that there's quite a lot of code which does
sizeof(blah)*BITS_PER_BYTE.  Fun newbie project.