linux-kernel - Re: [PATCH v3 1/2] kasan/hw-tags: introduce kasan.write

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Message-ID: <aKLT2QobergBhExD@e129823.arm.com>
Date: Mon, 18 Aug 2025 08:18:49 +0100
From: Yeoreum Yun <yeoreum.yun@....com>
To: kernel test robot <lkp@...el.com>
Cc: ryabinin.a.a@...il.com, glider@...gle.com, andreyknvl@...il.com,
	dvyukov@...gle.com, vincenzo.frascino@....com, corbet@....net,
	catalin.marinas@....com, will@...nel.org, akpm@...ux-foundation.org,
	scott@...amperecomputing.com, jhubbard@...dia.com,
	pankaj.gupta@....com, leitao@...ian.org, kaleshsingh@...gle.com,
	maz@...nel.org, broonie@...nel.org, oliver.upton@...ux.dev,
	james.morse@....com, ardb@...nel.org,
	hardevsinh.palaniya@...iconsignals.io, david@...hat.com,
	yang@...amperecomputing.com, oe-kbuild-all@...ts.linux.dev,
	kasan-dev@...glegroups.com, workflows@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-mm@...ck.org
Subject: Re: [PATCH v3 1/2] kasan/hw-tags: introduce kasan.write_only option

Hi.
> Hi Yeoreum,
>
> kernel test robot noticed the following build warnings:
>
> [auto build test WARNING on 8f5ae30d69d7543eee0d70083daf4de8fe15d585]
>
> url:    https://github.com/intel-lab-lkp/linux/commits/Yeoreum-Yun/kasan-hw-tags-introduce-kasan-write_only-option/20250816-190300
> base:   8f5ae30d69d7543eee0d70083daf4de8fe15d585
> patch link:    https://lore.kernel.org/r/20250816110018.4055617-2-yeoreum.yun%40arm.com
> patch subject: [PATCH v3 1/2] kasan/hw-tags: introduce kasan.write_only option
> config: arm64-randconfig-r053-20250818 (https://download.01.org/0day-ci/archive/20250818/202508180747.PxkbPnyA-lkp@intel.com/config)
> compiler: aarch64-linux-gcc (GCC) 10.5.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250818/202508180747.PxkbPnyA-lkp@intel.com/reproduce)
>
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202508180747.PxkbPnyA-lkp@intel.com/
>
> All warnings (new ones prefixed by >>):
>
>    mm/kasan/hw_tags.c: In function 'kasan_enable_hw_tags':
> >> mm/kasan/hw_tags.c:433:21: warning: comparison between 'enum kasan_arg_mode' and 'enum kasan_arg_write_only' [-Wenum-compare]
>      433 |  if (kasan_arg_mode == KASAN_ARG_WRITE_ONLY_ON &&
>          |                     ^~
>    mm/kasan/hw_tags.c:435:18: warning: comparison between 'enum kasan_arg_mode' and 'enum kasan_arg_write_only' [-Wenum-compare]
>      435 |   kasan_arg_mode == KASAN_ARG_WRITE_ONLY_OFF;
>          |                  ^~
> >> mm/kasan/hw_tags.c:435:18: warning: statement with no effect [-Wunused-value]
>      435 |   kasan_arg_mode == KASAN_ARG_WRITE_ONLY_OFF;
>          |   ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

Grr. Sorry I think I've sent the wrong version.
I'll fix it.

Sorry to make a noise.

--
Sincerely,
Yeoreum Yun