linux-kernel - Re: checkpatch.pl getting stuck on a macro in mm/kmsan/kmsan

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Date: Thu, 07 Mar 2024 09:13:32 -0800
From: Joe Perches <joe@...ches.com>
To: Lukas Bulwahn <lukas.bulwahn@...il.com>, Dan Carpenter
	 <dan.carpenter@...aro.org>
Cc: kernel-janitors <kernel-janitors@...r.kernel.org>, Linux Kernel
	Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: checkpatch.pl getting stuck on a macro in mm/kmsan/kmsan_test.c

On Wed, 2024-03-06 at 10:33 +0100, Lukas Bulwahn wrote:
> Dear Joe,
> 
> while running checkpatch.pl -f on all files in the kernel repository
> (v6.8-rc1) for some experiment, I noticed that checkpatch.pl got stuck
> on mm/kmsan/kmsan_test.c, i.e., ./scripts/checkpatch.pl -f
> mm/kmsan/kmsan_test.c never terminates.
> 
> I could already boil it down to checkpatch getting stuck on the macro
> #define DEFINE_TEST_MEMSETXX(size), see lines 541 to 554 in
> mm/kmsan/kmsan_test.c on v6.8-rc1.
> 
> I do not know if it is worth fixing, but certainly I was surprised
> that reasonable code can put checkpatch into some stuck state.
> 

I know why it hangs.  I'll give it a think for a bit.
I rather doubt Dan's suggestion is the appropriate one.

Code is:

		volatile uint##size##_t
uninit;			\

and in checkpatch line 2304:

			$possible =~ s/\s*$Type\s*//g;

where uint is a $Type it removes.