linux-kernel - Re: [PATCH] xen-blkfront: Use the bitmap API when applicable

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Message-ID: <06f74e760966a090027bcfec8c22e97bc040e933.camel@perches.com>
Date:   Fri, 03 Dec 2021 23:05:37 -0800
From:   Joe Perches <joe@...ches.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>, sstabellini@...nel.org,
        roger.pau@...rix.com, axboe@...nel.dk
Cc:     xen-devel@...ts.xenproject.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] xen-blkfront: Use the bitmap API when applicable

On Sat, 2021-12-04 at 07:57 +0100, Christophe JAILLET wrote:
> So, maybe adding an "official" 'bitmap_size()' (which is already 
> existing and duplicated in a few places) would ease things.
> 
> It would replace the 'nr_minors = BITS_TO_LONGS(end) * BITS_PER_LONG;' 
> and hide the implementation details of the bitmap API.
> 
> Something like:
> static __always_inline size_t bitmap_size(unsigned long nr_bits)
> {
> 	return BITS_TO_LONGS(nr_bits) * sizeof(long);
> }

Or maybe a bitmap_realloc