linux-kernel - Re: [PATCH] kbuild: modules_install: Warn if System.map file is not found

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Date:   Wed, 5 Sep 2018 09:15:54 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     linux-kbuild <linux-kbuild@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kbuild: modules_install: Warn if System.map file is not
 found

On 09/05/2018 12:17 AM, Masahiro Yamada wrote:
> Hi Randy,
> 
> 2018-09-01 7:33 GMT+09:00 Randy Dunlap <rdunlap@...radead.org>:
>> From: Randy Dunlap <rdunlap@...radead.org>
>>
>> If there is no System.map file for "make modules_install",
>> scripts/depmod.sh will silently exit with success, having done
>> nothing.  Since this is an unexpected situation, change it to
>> report a Warning for the missing file.  The behavior is not
>> changed except for the Warning message.
>>
>> The (previous) silent success and new Warning can be reproduced
>> by:
>> $ make mrproper; make defconfig
>> $ make modules; make modules_install
>>
>> and since System.map is produced by "make vmlinux", the steps
>> above omit producing the System.map file.
>>
>> Reported-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
>> Cc: Masahiro Yamada <yamada.masahiro@...ionext.com>
>> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
>> ---
>>  scripts/depmod.sh |    1 +
>>  1 file changed, 1 insertion(+)
>>
>> --- lnx-419-rc1.orig/scripts/depmod.sh
>> +++ lnx-419-rc1/scripts/depmod.sh
>> @@ -11,6 +11,7 @@ DEPMOD=$1
>>  KERNELRELEASE=$2
>>
>>  if ! test -r System.map ; then
>> +       echo "Warning: modules_install: missing 'System.map' file"
>>         exit 0
>>  fi
> 
> Thanks for the patch.
> 
> 
> For consistency, I'd like to suggest '>&2' for this warning too.
> 
> 
> Also, could you add a little more info
> about what happened (or what did not happen) then ?
> 
> 
> 
> For example,
> 
> 
> Warning: modules_install: missing 'System.map' file.  Skipping depmod.

Sure, will do.

thanks,
-- 
~Randy