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

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Message-ID: <b49c9993-7676-4d33-a2d6-9f6b77b0fd34@kernel.org>
Date: Fri, 23 Jan 2026 09:01:04 +0100
From: Vincent Mailhol <mailhol@...nel.org>
To: Philip Li <philip.li@...el.com>,
 Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
 Chris Li <sparse@...isli.org>, Al Viro <viro@...iv.linux.org.uk>
Cc: 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()

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?

That would be much less confusing.


Yours sincerely,
Vincent Mailhol