linux-kernel - Re: [PATCH v1 2/2] spi: Avoid potential UB when counting unused native CSs

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Message-ID: <YH7uGhEmnk2sBzVv@smile.fi.intel.com>
Date:   Tue, 20 Apr 2021 18:07:06 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/2] spi: Avoid potential UB when counting unused
 native CSs

On Tue, Apr 20, 2021 at 03:56:16PM +0100, Mark Brown wrote:
> On Tue, Apr 20, 2021 at 05:10:04PM +0300, Andy Shevchenko wrote:
> > ffz(), that has been used to count unused native CSs, might produce UB
> 
> Bit of an IA there...

UB -- undefined behaviour.
I'll decode it. Should I decode CS as well?

-- 
With Best Regards,
Andy Shevchenko