linux-kernel - Re: [PATCH v3] modules_install: make missing $DEPMOD a warning instead of an error

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Date:   Wed, 29 Aug 2018 10:06:34 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     linux-kbuild <linux-kbuild@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable <stable@...r.kernel.org>,
        Lucas De Marchi <lucas.demarchi@...fusion.mobi>,
        Lucas De Marchi <lucas.de.marchi@...il.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Jessica Yu <jeyu@...nel.org>,
        Chih-Wei Huang <cwhuang@...ux.org.tw>,
        "H. Nikolaus Schaller" <hns@...delico.com>
Subject: Re: [PATCH v3] modules_install: make missing $DEPMOD a warning
 instead of an error

Hi Randy

2018-08-29 4:55 GMT+09:00 Randy Dunlap <rdunlap@...radead.org>:
> On 08/23/2018 09:20 PM, Masahiro Yamada wrote:
>> Hi Randy,
>>
>>
>> 2018-08-24 3:13 GMT+09:00 Randy Dunlap <rdunlap@...radead.org>:
>>> From: Randy Dunlap <rdunlap@...radead.org>
>>>
>>> When $DEPMOD is not found, only print a warning instead of exiting
>>> with an error message and error status.
>>
>>
>> Could you add the motivation of this change
>> (as Nikolaus reported) ?
>>
>> Without the reason recorded in git-log,
>> somebody may wonder why this commit is useful.
>>
>
> Added for v4.

Thanks.




>> BTW, if System.map is missing, depmod is silently skipped.
>>
>>
>> I think if System.map is missing, a user is doing something wrong,
>> but you could do like this:
>>
>> $ make mrproper
>>    [snip]
>> $ make defconfig
>>    [snip]
>> $ make modules
>>    [snip]
>> $ make modules_install
>>   INSTALL drivers/thermal/x86_pkg_temp_thermal.ko
>>   INSTALL fs/efivarfs/efivarfs.ko
>>   INSTALL net/ipv4/netfilter/ipt_MASQUERADE.ko
>>   INSTALL net/ipv4/netfilter/iptable_nat.ko
>>   INSTALL net/ipv4/netfilter/nf_log_arp.ko
>>   INSTALL net/ipv4/netfilter/nf_log_ipv4.ko
>>   INSTALL net/ipv4/netfilter/nf_nat_ipv4.ko
>>   INSTALL net/ipv6/netfilter/nf_log_ipv6.ko
>>   INSTALL net/netfilter/nf_log_common.ko
>>   INSTALL net/netfilter/nf_nat.ko
>>   INSTALL net/netfilter/nf_nat_ftp.ko
>>   INSTALL net/netfilter/nf_nat_irc.ko
>>   INSTALL net/netfilter/nf_nat_sip.ko
>>   INSTALL net/netfilter/xt_LOG.ko
>>   INSTALL net/netfilter/xt_addrtype.ko
>>   INSTALL net/netfilter/xt_mark.ko
>>   INSTALL net/netfilter/xt_nat.ko
>>   DEPMOD  4.18.0+
>>
>>
>> The log looks like all the process went well,
>> but depmod is actually skipped because System.map is
>> generated by "make vmlinux"
>>
>>
>> What do you think we should do about this case?
>>
>> Skip depmod silently?
>> Make it fail?
>> Print noisy warning like missing depmod case?
>
> Since this shouldn't be happening, I prefer the noisy warning message
> like the missing depmod case.
>
> Do you want a separate patch for that?


Yes.  Could you send a patch?



-- 
Best Regards
Masahiro Yamada