linux-kernel - Re: (subset) [PATCH v7 00/16] Add audio support for the MediaTek Genio 350-evk board

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Message-ID: <20240906192323.GA3160860@thelio-3990X>
Date: Fri, 6 Sep 2024 12:23:23 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: Mark Brown <broonie@...nel.org>
Cc: Alexandre Mergnat <amergnat@...libre.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Lee Jones <lee@...nel.org>, Flora Fu <flora.fu@...iatek.com>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Christian König <christian.koenig@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	linux-sound@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org, linux-media@...r.kernel.org,
	dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
	Nicolas Belin <nbelin@...libre.com>
Subject: Re: (subset) [PATCH v7 00/16] Add audio support for the MediaTek
 Genio 350-evk board

On Fri, Sep 06, 2024 at 07:27:01PM +0100, Mark Brown wrote:
> Are these just warnings introduced by recent versions of the toolchains?
> These commits passed an x86 allmodconfig with GCC 12 at each step (I did
> catch one warning there with another patch in the series that didn't get
> applied) and 0day didn't say anything at any point.

Not sure, I did not look too hard. At cursory glance, I am not sure x86
allmodconfig would catch these, as this code depends on ARCH_MEDIATEK
(not COMPILE_TEST), which only exists for arm and arm64.

> > Clang 19:
> 
> That's relatively modern, though some of the warnings don't look
> particularly new and exciting.

Fair although I still see some of them on old versions too:

https://github.com/ClangBuiltLinux/continuous-integration2/actions/runs/10738441894

> >   sound/soc/mediatek/mt8365/mt8365-dai-adda.c:93:8: error: implicit conversion from 'unsigned long' to 'unsigned int' changes value from 18446744073709551614 to 4294967294 [-Werror,-Wconstant-conversion]
> >      91 |                 regmap_update_bits(afe->regmap, AFE_ADDA_UL_DL_CON0,
> >         |                 ~~~~~~~~~~~~~~~~~~
> >      92 |                                    AFE_ADDA_UL_DL_ADDA_AFE_ON,
> >      93 |                                    ~AFE_ADDA_UL_DL_ADDA_AFE_ON);
> >         |                                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~
> >   1 error generated.
> 
> That's a bit surprising, regmap_update_bits() takes an unsigned long?  I
> suspect the constants need to be defined as unsigned.

Does it? I see it taking 'unsigned int' for all of its parameters.

$ sed -n '1242,1250p' include/linux/regmap.h
int regmap_update_bits_base(struct regmap *map, unsigned int reg,
                            unsigned int mask, unsigned int val,
                            bool *change, bool async, bool force);

static inline int regmap_update_bits(struct regmap *map, unsigned int reg,
                                     unsigned int mask, unsigned int val)
{
        return regmap_update_bits_base(map, reg, mask, val, NULL, false, false);
}

Cheers,
Nathan