linux-kernel - Re: [PATCH v3 05/15] bus: ts-nbus: use bitmap_get

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Message-ID: <CAHp75Vch7QKyT8Fbya3u=YrPR8z-2-mbWXjHyOwZ-fqcBjjm0A@mail.gmail.com>
Date: Thu, 20 Feb 2025 14:06:53 +0200
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Simon Horman <horms@...nel.org>
Cc: David Lechner <dlechner@...libre.com>, Linus Walleij <linus.walleij@...aro.org>, 
	Bartosz Golaszewski <brgl@...ev.pl>, Andy Shevchenko <andy@...nel.org>, 
	Geert Uytterhoeven <geert@...ux-m68k.org>, Lars-Peter Clausen <lars@...afoo.de>, 
	Michael Hennerich <Michael.Hennerich@...log.com>, Jonathan Cameron <jic23@...nel.org>, 
	Ulf Hansson <ulf.hansson@...aro.org>, Peter Rosin <peda@...ntia.se>, Andrew Lunn <andrew@...n.ch>, 
	Heiner Kallweit <hkallweit1@...il.com>, Russell King <linux@...linux.org.uk>, 
	"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Vinod Koul <vkoul@...nel.org>, 
	Kishon Vijay Abraham I <kishon@...nel.org>, Nuno Sá <nuno.sa@...log.com>, 
	Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>, 
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>, linux-gpio@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org, 
	linux-mmc@...r.kernel.org, netdev@...r.kernel.org, 
	linux-phy@...ts.infradead.org, linux-sound@...r.kernel.org
Subject: Re: [PATCH v3 05/15] bus: ts-nbus: use bitmap_get_value8()

On Thu, Feb 20, 2025 at 12:17 PM Simon Horman <horms@...nel.org> wrote:
> On Mon, Feb 10, 2025 at 04:33:31PM -0600, David Lechner wrote:

...

> But when compiling with GCC 14.2.0 I see warnings that values
> is used uninitialised - bitmap_set_value8() appears to rely on
> it being so.

> In file included from drivers/bus/ts-nbus.c:13:
> In function ‘bitmap_write’,
>     inlined from ‘ts_nbus_reset_bus’ at drivers/bus/ts-nbus.c:111:2:
> ./include/linux/bitmap.h:818:12: error: ‘values’ is used uninitialized [-Werror=uninitialized]
>   818 |         map[index] &= (fit ? (~(mask << offset)) : ~BITMAP_FIRST_WORD_MASK(start));
>       |         ~~~^~~~~~~

Heh, the compiler is dumb. Even if it's not initialised we do not care.

...

Wondering if the bitmap_write() will work better...

-- 
With Best Regards,
Andy Shevchenko