linux-kernel - Re: arch/sh/kernel/relocate_kernel.S:38: Error: invalid operands for opcode

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Message-ID: <20231220060030.GV1674809@ZenIV>
Date: Wed, 20 Dec 2023 06:00:30 +0000
From: Al Viro <viro@...iv.linux.org.uk>
To: Baoquan He <bhe@...hat.com>
Cc: kernel test robot <lkp@...el.com>, oe-kbuild-all@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: arch/sh/kernel/relocate_kernel.S:38: Error: invalid operands for
 opcode

On Wed, Dec 20, 2023 at 01:44:19PM +0800, Baoquan He wrote:

> >    arch/sh/kernel/relocate_kernel.S: Assembler messages:
> > >> arch/sh/kernel/relocate_kernel.S:38: Error: invalid operands for opcode
> >    arch/sh/kernel/relocate_kernel.S:41: Error: invalid operands for opcode
> >    arch/sh/kernel/relocate_kernel.S:126: Error: invalid operands for opcode
> >    arch/sh/kernel/relocate_kernel.S:129: Error: invalid operands for opcode
> 
> I reproduced this error, haven't got why and a way to fix it, will come
> back later if I have fix.

At a guess - after that commit ARCH_SUPPORTS_CRASH_DUMP is enough to enable CRASH_DUMP,
which selects KEXEC_CORE regardless of ARCH_SUPPORTS_KEXEC.  And on sh you have
the former selected on any UP build, while the latter - only on MMU ones (i.e.
not SH2).