linux-kernel - Difference in values of addresses in System.map and /proc/kallsyms

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Date:   Sat, 22 Jun 2019 20:58:29 +0530
From:   Ajay Garg <ajaygargnsit@...il.com>
To:     linux-kernel@...r.kernel.org
Subject: Difference in values of addresses in System.map and /proc/kallsyms

Hi All.

My system is

ajay@...itude-3480:~$ uname -a
Linux latitude-3480 4.13.0-38-generic #43~16.04.1-Ubuntu SMP Wed Mar
14 17:48:43 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux


When I see the address for a symbol, say linux_banner, in
/boot/System.map-4.13.0-38-generic, it shows
ffffffff81e00120 R linux_banner

However, when I see it in /proc/kallsyms, it shows
ffffffffa7000120 R linux_banner


Also, I note that /proc/kallsyms addresses vary upon reboots, so I am
a little confused as to what the entries in /proc/kallsyms really
mean.
So, will be grateful for some pointers from the experts :)


Thanks and Regards,
Ajay