linux fan wrote:
> On 2/18/10, Bruce Dubbs <bruce.du...@gmail.com> wrote:
>> My understanding is that klogd reads the symbols to translate kernel
>> oops to symbols. I think I saw that the kernel is now doing that
>> internally. In that case, there is no need for klogd to read System.map
>> at all.
>
> That is what Linus said in reply to an email:
>
> On Sat, 7 Nov 2009, linux fan wrote:
>> "[PATCH] init/version.c: Define version_string only if"
>> causes sysklogd to report "Cannot find map"
>
> But isn't that what we _want_.
>
> If we have CONFIG_KALLSYMS, then we do _not_ want sysklogd to try to
> interpret kernel addresses, because the kernel will do that itself.
>
> So the sysklogd "Cannot find map" warning is a feature, not a bug.
>
> I think.
>
> Linus
I saw that when I was researching last night. I don't think it is a
feature. It implies something is wrong. When something is right in
Linux/Unix, the application should stay silent.
One thing I was thinking about was modifying /etc/rc.d/init.d/sysklog to
check for "Version_" in the System.map and change the parameters passed
to klogd accordingly. Something like below.
-- Bruce
kversion=$(uname -r)
major=$(echo $kversion | cut -d. -f1)
minor=$(echo $kversion | cut -d. -f2)
patch=$(echo $kversion | cut -d. -f3)
kversiond=$(( $major * 65536 + $minor * 256 + $patch ))
for map in /boot/System.map-$kversion /boot/System.map
do
version=$(grep Version_ $map | cut -d_ -f2)
if [ x$version == x$kversiond ] ; then
MAP=$map
break
fi
done
if [ x$MAP == x ] ; then
KLOGD_OPTION=-x
else
KLOGD_OPTION="-k $MAP"
fi
boot_mesg "Starting kernel log daemon..."
loadproc klogd $KLOGD_OPTION
--
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