linux-kernel - Re: [PATCH v2 2/3] counter: 104-quad-8: Refactor to buffer states for CMR, IOR, and IDR

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Date:   Mon, 27 Mar 2023 12:55:04 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     William Breathitt Gray <william.gray@...aro.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Johannes Berg <johannes.berg@...el.com>,
        Al Viro <viro@...iv.linux.org.uk>, linux-iio@...r.kernel.org,
        Jonathan Cameron <jic23@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] counter: 104-quad-8: Refactor to buffer states
 for CMR, IOR, and IDR

+Cc clang (for the ideas you might have, while the issue seems related to GCC[?] )

On Sun, Mar 26, 2023 at 08:01:23PM -0400, William Breathitt Gray wrote:
> On Fri, Mar 24, 2023 at 11:35:02AM -0400, William Breathitt Gray wrote:
> > There are eight calls to quad8_control_register_update() in 104-quad-8:
> > 
> >         quad8_control_register_update(priv, priv->idr, id, DISABLE_INDEX_MODE, INDEX_MODE);
> >         quad8_control_register_update(priv, priv->cmr, id, mode_cfg, QUADRATURE_MODE);
> >         quad8_control_register_update(priv, priv->ior, event_node->channel, flg_pins, FLG_PINS);
> >         quad8_control_register_update(priv, priv->idr, channel_id, index_polarity, INDEX_POLARITY);
> >         quad8_control_register_update(priv, priv->idr, channel_id, synchronous_mode, INDEX_MODE);
> >         quad8_control_register_update(priv, priv->cmr, count->id, count_mode, COUNT_MODE);
> >         quad8_control_register_update(priv, priv->ior, count->id, enable, AB_GATE);
> >         quad8_control_register_update(priv, priv->ior, count->id, !preset_enable, LOAD_PIN);
> 
> I attempted the cross-compiling using an x86-64 system and I was able to
> recreate the build error. I tried to isolate the problem line by
> commenting out quad8_control_register_update() calls and discover that
> this appears to be an inline issue after all: if there are more than six
> calls to quad8_control_register_update() are in the code, then the
> '__bad_mask' build error occurs.
> 
> The build error doesn't occur if I force the inline via __always_inline,
> so I'll add that to quad8_control_register_update() to resolve this
> issue and submit a v3 patchset later this week.

Doe it mean it's a compiler error? Or is it a code error?

I'm wondering if clang also fails here.

-- 
With Best Regards,
Andy Shevchenko