Re: [PATCH] dax: use assign_bit() where applicable

[Peng Fan]

Hi Alison,

On Wed, Oct 07, 2026 at 06:59:48PM -0700, Alison Schofield wrote:
>On Tue, Sep 22, 2026 at 12:08:13AM +0100, Jonathan Cameron wrote:
>> On Mon, 21 Sep 2026 10:24:51 +0200
>> "Gupta, Pankaj" <pankaj.gupta@xxxxxxx> wrote:
>> 
>> > > [You don't often get email from peng.fan@xxxxxxxxxxx. Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ]
>> > >
>> > > From: Peng Fan <peng.fan@xxxxxxx>
>> > >
>> > > Convert open-coded if/else with set_bit/clear_bit to the assign_bit API.
>> > >
>> > > Signed-off-by: Peng Fan <peng.fan@xxxxxxx>  
>> > 
>> > Reviewed-by: Pankaj Gupta <pankaj.gupta@xxxxxxx>
>> 
>> A bit marginal wrt to churn but a good change in general.
>> Up to DAX maintainers on whether they want this type of small
>> focused improvement.
>
>I didn't see the improvement. When I peruse the file I see set_bit and
>clear_bit, and now I see a couple of those obfuscated by a new
>assign_bit, needlessly.
>
>If Peng wants to come back around with a 'why' then I'd take another
>look. I shared my NAK story here:
>
>https://lore.kernel.org/lkml/asb3hGpSWVQk93cX@xxxxxxxxxxxxxxxxxx/

Thanks for taking the time to explain, and for the link to your
earlier reply - that was useful context.

This patch was done by a cocci rule.
sorry for not providing a justification for this particular conversion or
making the intent clearer. Converting only some of the call sites leaves the
file with a mix of styles.

Free to drop the patch.

Thanks
Peng

>
>
>> 
>> Reviewed-by: Jonathan Cameron <jonathan.cameron@xxxxxxxxxxxxxxxx>
>> 
>> > 
>> > > ---
>> > >   drivers/dax/super.c | 5 +----
>> > >   1 file changed, 1 insertion(+), 4 deletions(-)
>> > >
>> > > diff --git a/drivers/dax/super.c b/drivers/dax/super.c
>> > > index 45f84b0eb909..60c4aec52ae1 100644
>> > > --- a/drivers/dax/super.c
>> > > +++ b/drivers/dax/super.c
>> > > @@ -385,10 +385,7 @@ EXPORT_SYMBOL_GPL(dax_flush);
>> > >
>> > >   void dax_write_cache(struct dax_device *dax_dev, bool wc)
>> > >   {
>> > > -       if (wc)
>> > > -               set_bit(DAXDEV_WRITE_CACHE, &dax_dev->flags);
>> > > -       else
>> > > -               clear_bit(DAXDEV_WRITE_CACHE, &dax_dev->flags);
>> > > +       assign_bit(DAXDEV_WRITE_CACHE, &dax_dev->flags, wc);
>> > >   }
>> > >   EXPORT_SYMBOL_GPL(dax_write_cache);
>> > >
>> > > --
>> > > 2.51.0
>> > >
>> > >  
>> > 
>> 
>