[CentOS] C7 Kernel module compilation

Il 07/08/19 20:15, Akemi Yagi ha scritto:
> On Wed, Aug 7, 2019 at 9:00 AM Alessandro Baggi
> <alessandro.baggi at gmail.com> wrote:
>>
>> Il 07/08/19 01:02, Phil Perry ha scritto:
>>> On 06/08/2019 14:45, Alessandro Baggi wrote:
> 
>>> Please post the actual error message in dmesg or /var/log/messages.
>>>
>>> It's likely that the kernel is just grumbling that the module is not
>>> signed (missing key), but it's just noise unless you're using
>>> SecureBoot. Posting the actual message in full will help determine if
>>> that is the case.
>>>
>>> Thanks
>>>
>>> Phil
>>
>> Hi, thank you for your reply,
>> I solve adding in "General Setup" values of current kernel on
>> localversion option and adding Module.symver from
>> /boot/symver-version.gz to module directory.
>>
>> Now I get another problem compiling the third party module (i2c-nct6775):
>>
>> "CONFIG_RETPOLINE=y but not supported by the compiler. Compiler update
>> recomended. Stop."
>>
>> I tried using scl gcc7 and 8 but get the same issue.
>>
>> I checked that retpoline is related to Spectre but checking on centos with:
>>
>> cat /sys/devices/system/cpu/vulnerabilities/spectre_v2
>>
>> I get:
>>
>> Mitigation: IBRS (kernel), IBPB
>>
>> and RETPOLINE seems disabled (I'm wrong?).
>>
>> I ridden in a blog post that I can disable this check commenting out
>> some lines starting from N. 166 of arch/Makefile but I don't think this
>> is the best approach.
>>
>> At this point I can't understand what means the previous error and why I
>> get this error when compiling i2c-nct6775.
>>
>> Can someone point me in the right direction?
> 
> Please post the output from:
> 
> rpm -qa kernel\* | sort
> 
> and
> 
> uname -r
> 
> Akemi
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> 

kernel-3.10.0-957.12.1.el7.x86_64
kernel-3.10.0-957.12.2.el7.x86_64
kernel-3.10.0-957.21.3.el7.x86_64
kernel-3.10.0-957.27.2.el7.x86_64
kernel-3.10.0-957.el7.x86_64
kernel-devel-3.10.0-957.21.3.el7.x86_64
kernel-devel-3.10.0-957.27.2.el7.x86_64
kernel-headers-3.10.0-957.27.2.el7.x86_64
kernel-ml-5.1.0-1.el7.elrepo.x86_64
kernel-ml-devel-5.1.0-1.el7.elrepo.x86_64
kernel-tools-3.10.0-957.27.2.el7.x86_64
kernel-tools-libs-3.10.0-957.27.2.el7.x86_64
kernel-tools-libs-devel-3.10.0-957.27.2.el7.x86_64


3.10.0-957.27.2.el7.x86_64