linux-kernel - RE: [PATCH 2/3] x86:add missing CONFIG_STRICT_KERNEL_RWX for mark_rodata

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Date:   Wed, 30 May 2018 06:51:19 +0000
From:   Nixiaoming <nixiaoming@...wei.com>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Ingo Molnar <mingo@...nel.org>
CC:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Marc Zyngier <marc.zyngier@....com>,
        James Morse <james.morse@....com>,
        Kristina Martsenko <kristina.martsenko@....com>,
        "Steve Capper" <steve.capper@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Ingo Molnar" <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Michal Hocko <mhocko@...e.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        "zhang.jia@...ux.alibaba.com" <zhang.jia@...ux.alibaba.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        linux-s390 <linux-s390@...r.kernel.org>
Subject: RE: [PATCH 2/3] x86:add missing CONFIG_STRICT_KERNEL_RWX for
 mark_rodata_ro

On 30 May 2018 at 2:07PM Ard Biesheuvel [mailto:ard.biesheuvel@...aro.org] wrote:

>On 30 May 2018 at 07:58, Ingo Molnar <mingo@...nel.org> wrote:
>>
>> * nixiaoming <nixiaoming@...wei.com> wrote:
>>
>>> mark_rodata_ro is only called by the function mark_readonly
>>> when CONFIG_STRICT_KERNEL_RWX=y
>>>
>>> if CONFIG_STRICT_KERNEL_RWX is not set
>>> a compile warning may be triggered: unused function
>....
>>
>> NAK, this is very ugly and the changelog doesn't appear to be true: the build
>> warning does not trigger in the default build, correct?
>>
>
>I don't see how the build warning could trigger at all, given that
>mark_rodata_ro() has external linkage.
>

Unable to set CONFIG_STRICT_KERNEL_RWX=n by make menuconfig ARCH=x86_64
the build warning does not trigger in the default build, 
but it should be more appropriate to add CONFIG control to the code.