linux-kernel - Re: /bin/bash: line 1: 45878 Segmentation fault sparse -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise -Wno-return-void -Wno-unknown-attribute -fdiagnostic-prefix -D__CHECK_ENDIAN__ -D__NDS32_EL__ --arch=nds32 -mlittle-endian -m32 -Wp,-MMD,ker...

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Date:   Tue, 7 Jun 2022 14:42:09 +0200
From:   Luc Van Oostenryck <luc.vanoostenryck@...il.com>
To:     Yafang Shao <laoar.shao@...il.com>
Cc:     kernel test robot <lkp@...el.com>, kbuild-all@...ts.01.org,
        LKML <linux-kernel@...r.kernel.org>, yujie.liu@...el.com,
        linux-sparse@...r.kernel.org
Subject: Re: /bin/bash: line 1: 45878 Segmentation fault sparse -D__linux__
 -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise -Wno-return-void
 -Wno-unknown-attribute -fdiagnostic-prefix -D__CHECK_ENDIAN__ -D__NDS32_EL__
 --arch=nds32 -mlittle-endian -m32 -Wp,-MMD,ker...

On Sat, Nov 13, 2021 at 10:46:04PM +0800, Yafang Shao wrote:
> On Sat, Nov 13, 2021 at 12:25 PM kernel test robot <lkp@...el.com> wrote:
> >
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > head:   66f4beaa6c1d28161f534471484b2daa2de1dce0
> > commit: 60f2415e19d3948641149ac6aca137a7be1d1952 sched: Make schedstats helpers independent of fair sched class
> > date:   6 weeks ago
> > config: nds32-randconfig-s031-20211015 (attached as .config)
> > compiler: nds32le-linux-gcc (GCC) 11.2.0

...

> > All errors (new ones prefixed by >>):
> >
> >    include/linux/rtmutex.h:68:58: sparse: sparse: got $

Hi,

Apologies for this late reply.

The error was caused by the line:
	#define tsk $r25
in arch/nds32/include/asm/current.h

I suppose it was only meant for assembly files but was also included in
(most) C files and the '$' character made sparse crash in some weird
circumstances. Patch is on the way.

-- Luc