linux-kernel - Re: [PATCH v9 01/17] h8300: Assembly headers.

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Date:	Mon, 27 Apr 2015 09:48:39 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Tobias Klauser <tklauser@...tanz.ch>
Cc:	Yoshinori Sato <ysato@...rs.sourceforge.jp>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH v9 01/17] h8300: Assembly headers.

On Monday 27 April 2015 09:42:41 Tobias Klauser wrote:
> > diff --git a/arch/h8300/include/asm/elf.h b/arch/h8300/include/asm/elf.h
> > new file mode 100644
> > index 0000000..09031d0
> > --- /dev/null
> > +++ b/arch/h8300/include/asm/elf.h
> > @@ -0,0 +1,101 @@
> > +#ifndef __ASM_H8300_ELF_H
> > +#define __ASM_H8300_ELF_H
> > +
> > +/*
> > + * ELF register definitions..
> > + */
> > +
> > +#include <asm/ptrace.h>
> > +#include <asm/user.h>
> > +
> > +typedef unsigned long elf_greg_t;
> > +
> > +#define ELF_NGREG (sizeof(struct user_regs_struct) / sizeof(elf_greg_t))
> > +typedef elf_greg_t elf_gregset_t[ELF_NGREG];
> > +typedef unsigned long elf_fpregset_t;
> > +
> > +/*
> > + * This is used to ensure we don't load something for the wrong architecture.
> > + */
> > +#define elf_check_arch(x) ((x)->e_machine == EM_H8_300)
> 
> EM_H8_300 is still used before it is introduced in patch 15/17, please
> change the patch order. Otherwise you break bisectability.

While that is true in principle, I really wouldn't care about that
when introducing a new architecture: There is no way to use this
code unless you introduce all code first.

For any later add-ons, bisectability should of course be maintained.

	Arnd
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