From: Dave Jones <davej@redhat.com>
To: linux-acpi@vger.kernel.org
Subject: systemd, fpdt and /dev/mem
Date: Mon, 10 Nov 2014 16:21:42 -0500 [thread overview]
Message-ID: <20141110212142.GA2337@redhat.com> (raw)
I just noticed systemd has started doing this:
[ 3228.978745] Program systemd tried to access /dev/mem between 30a48000->30a48008.
After some investigation, it seems that it's reading
/sys/firmware/acpi/tables/FPDT to get a pointer, and then trying to read
that address using /dev/mem. Asides from the grossness of grovelling around in
memory, given it's too late to stop exporting pointers in sysfs objects,
should there perhaps be a better way to export the data the FPDT is
pointing at ?
Or should some part of acpi be reserving the memory range it points to,
so that the /dev/mem driver doesn't freak out ?
Curiously, the address it points to is in this range..
302b5000-3129dfff : Kernel bss
Which makes me wonder what exactly it's reading.
Dave
reply other threads:[~2014-11-10 21:21 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20141110212142.GA2337@redhat.com \
--to=davej@redhat.com \
--cc=linux-acpi@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.