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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <aXLN4iUVMczH042p@rli9-mobl>
Date: Fri, 23 Jan 2026 09:24:50 +0800
From: Philip Li <philip.li@...el.com>
To: David Laight <david.laight.linux@...il.com>
CC: kernel test robot <lkp@...el.com>, 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, Jan 22, 2026 at 10:33:37AM +0000, David Laight wrote:
> 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) ?

Got it, we will avoid the direct report this 'sparse: Variable length array is used' warning.

> 
> 	David
>