linux-kernel - Re: [PATCH] x86/tools/relocs: Add _etext and __end_of_kernel_reserve to S

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Message-ID: <20200110205028.GA2012059@rani.riverdale.lan>
Date:   Fri, 10 Jan 2020 15:50:29 -0500
From:   Arvind Sankar <nivedita@...m.mit.edu>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Arvind Sankar <nivedita@...m.mit.edu>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org>,
        Thomas Lendacky <Thomas.Lendacky@....com>
Subject: Re: [PATCH] x86/tools/relocs: Add _etext and __end_of_kernel_reserve
 to S_REL

On Fri, Jan 10, 2020 at 09:38:28PM +0100, Borislav Petkov wrote:
> On Fri, Jan 10, 2020 at 03:23:49PM -0500, Arvind Sankar wrote:
> > Pre-2.23 binutils makes symbols defined outside sections absolute, so
> > these two symbols break the build on old linkers.
> 
> -ENOTENOUGHINFO
> 
> Which old linkers, how exactly do they break the build, etc etc?
> 
> Please give exact reproduction steps.
> 
> Thx.
> 

binutils-2.21 and -2.22. An x86-64 defconfig will fail with
	Invalid absolute R_X86_64_32S relocation: _etext
and after fixing that one, with
	Invalid absolute R_X86_64_32S relocation: __end_of_kernel_reserve

Similar errors with 32-bit defconfig.

Should I resend with that added to the commit message?