linux-kernel - Re: [PATCH 2/2] LoongArch: Add support for relocating the kernel with RELR relocation

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Message-ID: <CAAhV-H4CQMmrLRv=vi8N63p2NXbdozpDakJLia8soFvVohCbqQ@mail.gmail.com>
Date: Sat, 6 Jul 2024 21:49:40 +0800
From: Huacai Chen <chenhuacai@...nel.org>
To: Xi Ruoyao <xry111@...111.site>
Cc: WANG Xuerui <kernel@...0n.name>, Jinyang He <hejinyang@...ngson.cn>, 
	Youling Tang <tangyouling@...inos.cn>, Tiezhu Yang <yangtiezhu@...ngson.cn>, 
	Fangrui Song <maskray@...gle.com>, Nathan Chancellor <nathan@...nel.org>, 
	Nick Desaulniers <ndesaulniers@...gle.com>, loongarch@...ts.linux.dev, 
	linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH 2/2] LoongArch: Add support for relocating the kernel with
 RELR relocation

On Sat, Jul 6, 2024 at 6:34 PM Xi Ruoyao <xry111@...111.site> wrote:
>
> On Sat, 2024-07-06 at 18:29 +0800, Huacai Chen wrote:
>
> /* snip */
>
> > > diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
> > > index ddc042895d01..03b3ef5edd24 100644
> > > --- a/arch/loongarch/Kconfig
> > > +++ b/arch/loongarch/Kconfig
> > > @@ -607,6 +607,7 @@ config ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
> > >
> > >  config RELOCATABLE
> > >         bool "Relocatable kernel"
> > > +       select ARCH_HAS_RELR
> > Why is this selection under RELOCATABLE? I know ARM64 is the same, but
> > why?
>
> Because if we just select it in CONFIG_LOONGARCH instead of
> CONFIG_RELOCATABLE, the users who have disabled CONFIG_RELOCATABLE will
> still see the entry for RELR in their configuration interface.  And
> they'll ask "hey what's this for?  Why my kernel needs relocation?"
RELR is not a similar conception to RELA, it is only used for
relocatable kernel?

Huacai

>
> --
> Xi Ruoyao <xry111@...111.site>
> School of Aerospace Science and Technology, Xidian University