linux-kernel - Re: [PATCH v12 1/5] x86/boot: Add get_acpi_rsdp() to parse RSDP in cmdline from KEXEC

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Date:   Fri, 30 Nov 2018 10:43:47 +0800
From:   Chao Fan <fanc.fnst@...fujitsu.com>
To:     Masayoshi Mizuma <msys.mizuma@...il.com>
CC:     <linux-kernel@...r.kernel.org>, <x86@...nel.org>, <bp@...en8.de>,
        <tglx@...utronix.de>, <mingo@...hat.com>, <hpa@...or.com>,
        <keescook@...omium.org>, <bhe@...hat.com>,
        <indou.takao@...fujitsu.com>, <caoj.fnst@...fujitsu.com>
Subject: Re: [PATCH v12 1/5] x86/boot: Add get_acpi_rsdp() to parse RSDP in
 cmdline from KEXEC

>> +
>> +/* acpitb.c */
>> +#define BOOT_STRING
>> +extern int kstrtoull(const char *s, unsigned int base, unsigned long long *res);
>> diff --git a/lib/kstrtox.c b/lib/kstrtox.c
>> index 1006bf70bf74..a0ac1b2257b8 100644
>> --- a/lib/kstrtox.c
>> +++ b/lib/kstrtox.c
>> @@ -126,6 +126,9 @@ int kstrtoull(const char *s, unsigned int base, unsigned long long *res)
>>  }
>>  EXPORT_SYMBOL(kstrtoull);
>>  
>> +/* Make compressed period code be able to use kstrtoull(). */
>> +#ifndef BOOT_STRING
>
>I got the following build error.
>
>]$ make arch/x86/boot/compressed/misc.o
>  CALL    scripts/checksyscalls.sh
>  DESCEND  objtool
>  CC      arch/x86/boot/compressed/misc.o
>ld: -r and -pie may not be used together
>make[1]: *** [scripts/Makefile.build:294: arch/x86/boot/compressed/misc.o] Error 1
>make: *** [Makefile:1715: arch/x86/boot/compressed/misc.o] Error 2
>]$

Hi Masa,

So many thanks for your test.

Could you give me more details about this error? More error message.
Just on the first commit or the whole PATCHSET?
Cause I didn't get error both on this commit and on the whole PATCHSET.

Thanks,
Chao Fan

>
>I think this error gets fixed by changing the BOOT_STRING ifndef
>order before the EXPORT_SYMBOL, like this:
>
>#ifndef BOOT_STRING
>EXPORT_SYMBOL(kstrtoull);
>
>I'm not sure this change is a good way...
>
>Thanks,
>Masa
>
>