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

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Message-ID: <aXMtJ_JurQjvN4tU@smile.fi.intel.com>
Date: Fri, 23 Jan 2026 10:11:19 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Vincent Mailhol <mailhol@...nel.org>
Cc: Philip Li <philip.li@...el.com>, Chris Li <sparse@...isli.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	David Laight <david.laight.linux@...il.com>,
	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>,
	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 Fri, Jan 23, 2026 at 09:01:04AM +0100, Vincent Mailhol wrote:
> Adding the relevant parties to the discussion:
> 
> +To: Al Viro
> +To: Chris Li
> 
> On 23/01/2026 at 02:25, Philip Li wrote:
> > On Thu, Jan 22, 2026 at 04:26:44PM +0200, Andy Shevchenko wrote:
> >> 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.
> > 
> > Thanks Andy, i will switch to the repo from Al Viro for sparse.
> 
> Al Viro's fork just adds 8 commit on top of the upstream sparse repo.
> Wouldn't it be possible to just merge those?

Ideally yes, but you also should kick the distro's asses to update it, and
the sparse should bump its version...

> That would be much less confusing.

Seems Al become a sparse maintainer de facto :-)

-- 
With Best Regards,
Andy Shevchenko