netdev - Re: [PATCH v1] ISDN: eicon: switch to use native bitmaps

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Message-Id: <20170704.034135.1806741431884009078.davem@davemloft.net>
Date:   Tue, 04 Jul 2017 03:41:35 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     andriy.shevchenko@...ux.intel.com
Cc:     mac@...ware.de, isdn@...ux-pingi.de, netdev@...r.kernel.org
Subject: Re: [PATCH v1] ISDN: eicon: switch to use native bitmaps

From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Date: Tue,  4 Jul 2017 13:34:51 +0300

> Two arrays are clearly bit maps, so, make that explicit by converting to
> bitmap API and remove custom helpers.
> 
> Note sig_ind() uses out of boundary bit to (looks like) protect against
> potential bitmap_empty() checks for the same bitmap.
> 
> This patch removes that since:
> 1) that didn't guarantee atomicity anyway;
> 2) the first operation inside the for-loop is set bit in the bitmap
>    (which effectively makes it non-empty);
> 3) group_optimization() doesn't utilize possible emptiness of the bitmap
>    in question.
> 
> Thus, if there is a protection needed it should be implemented properly.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

net-next is closed, please submit this when net-next opens back up.

Thank you.