linux-kernel - Re: [PATCH 0/4] Handle memmap and mem kernel options in boot stage kaslr

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Date:   Mon, 24 Apr 2017 10:46:17 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     linux-kernel@...r.kernel.org, keescook@...omium.org,
        dave.jiang@...el.com, dan.j.williams@...el.com, hpa@...or.com,
        tglx@...utronix.de, dyoung@...hat.com
Subject: Re: [PATCH 0/4] Handle memmap and mem kernel options in boot stage
 kaslr

On 04/18/17 at 02:51pm, Ingo Molnar wrote:
> 
> * Baoquan He <bhe@...hat.com> wrote:
> 
> > On 04/18/17 at 11:47am, Ingo Molnar wrote:
> > > I ported this series to tip:x86/boot (please post future versions against that), 
> > > and beyond a trivial conflict with e820entry => e820_entry, it fails to build on 
> > > 32-bit allmodconfig:
> > > 
> > >   ld: -r and -shared may not be used together
> > >   scripts/Makefile.build:294: recipe for target 'arch/x86/boot/compressed/kaslr.o' failed
> > > 
> > > ... which could be due to bad relocations, but I've not dug any further.
> > 
> > Thanks, Ingo!
> > 
> > I will find a x86_32 system to try allmodconfig.
> 
> No need, on a 64-bit system just do:
> 
> 	make ARCH=i386 allmodconfig

Those EXPORT_SYMBOL(sym) in lib/ctype.c|cmdline.c caused this build
failure. I added below code to skip linux/export.h including, it works.
However I haven't found out why EXPORT_SYMBOL in boot stage caused the
failure.

#define _LINUX_EXPORT_H
#define EXPORT_SYMBOL(sym)

> 
> and build the kernel the regular way.
> 
> Thanks,
> 
> 	Ingo