linux-kernel - Re: [PATCH next 11/14] bit: Strengthen compile-time tests in GENMASK() and BIT()

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Message-ID: <20260122103337.26473d1c@pumpkin>
Date: Thu, 22 Jan 2026 10:33:37 +0000
From: David Laight <david.laight.linux@...il.com>
To: kernel test robot <lkp@...el.com>
Cc: Nathan Chancellor <nathan@...nel.org>, Greg Kroah-Hartman
 <gregkh@...uxfoundation.org>, Thomas Gleixner <tglx@...utronix.de>, Peter
 Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...nel.org>, Mathieu
 Desnoyers <mathieu.desnoyers@...icios.com>, Arnd Bergmann <arnd@...db.de>,
 linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org, Yury Norov
 <yury.norov@...il.com>, Jani Nikula <jani.nikula@...el.com>, Vincent
 Mailhol <mailhol.vincent@...adoo.fr>, Andy Shevchenko
 <andriy.shevchenko@...ux.intel.com>, Kees Cook <keescook@...omium.org>,
 Andrew Morton <akpm@...ux-foundation.org>, oe-kbuild-all@...ts.linux.dev,
 Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: [PATCH next 11/14] bit: Strengthen compile-time tests in
 GENMASK() and BIT()

On Thu, 22 Jan 2026 12:41:22 +0800
kernel test robot <lkp@...el.com> wrote:

> Hi,
> 
> kernel test robot noticed the following build warnings:
> 
> [auto build test WARNING on next-20260120]
> 
> url:    https://github.com/intel-lab-lkp/linux/commits/david-laight-linux-gmail-com/overflow-Reduce-expansion-of-__type_max/20260122-013456
> base:   next-20260120
> patch link:    https://lore.kernel.org/r/20260121145731.3623-12-david.laight.linux%40gmail.com
> patch subject: [PATCH next 11/14] bit: Strengthen compile-time tests in GENMASK() and BIT()
> config: mips-randconfig-r132-20260122 (https://download.01.org/0day-ci/archive/20260122/202601221237.soiAkwkN-lkp@intel.com/config)
> compiler: mips64-linux-gcc (GCC) 10.5.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260122/202601221237.soiAkwkN-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/202601221237.soiAkwkN-lkp@intel.com/
> 
> sparse warnings: (new ones prefixed by >>)
>    kernel/kthread.c: note: in included file (through include/linux/bitmap.h, include/linux/cpumask.h, arch/mips/include/asm/processor.h, ...):
> >> include/linux/find.h:209:45: sparse: sparse: Variable length array is used.  

Can we stop sparse complaining about sizeof(VLA) ?

	David