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

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Message-ID: <aXIzpC6wpdv47cSH@smile.fi.intel.com>
Date: Thu, 22 Jan 2026 16:26:44 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.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>,
	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:

> > 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) ?

First of all, the LKP should install the fork of sparse by Al Viro. That will
fix tons of warnings that are related to modules and speed up the process
itself.

-- 
With Best Regards,
Andy Shevchenko