linux-kernel - Re: [PATCH 0/3] Cleanup and optimize a few bitmap operations

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Date:   Thu, 25 Nov 2021 13:30:53 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     bharat@...lsio.com, dledford@...hat.com,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 0/3] Cleanup and optimize a few bitmap operations

On Wed, Nov 24, 2021 at 10:30:08PM +0100, Christophe JAILLET wrote:
> Patch 1 and 2 are just cleanups that uses 'bitmap_zalloc()' and 'bitmap_set()'
> instead of hand-writing these functions.
> 
> Patch 3 is more questionable. It replaces calls to '[set|clear]_bit()' by their
> non-atomic '__[set|clear]_bit()' alternatives.
> It looks safe to do so because accesses to the corresponding bitmaps are
> protected by spinlocks.
> However, this patch is compile-tested only. It is not sure that it worth
> changing the code just for saving a few atomic operations.
> So review, test and apply only if it make sense.
> 
> Christophe JAILLET (3):
>   RDMA/cxgb4: Use bitmap_zalloc() when applicable
>   RDMA/cxgb4: Use bitmap_set() when applicable
>   RDMA/cxgb4: Use non-atomic bitmap functions when possible

Applied to for-next, thanks

Jason