Re: System.map versus /proc/kallsyms

["Robert P. J. Day" <rpjday@xxxxxxxxxxxxxx>]

On Tue, 3 Jul 2007, Guennadi Liakhovetski wrote:

> On Mon, 2 Jul 2007, Robert P. J. Day wrote:
>
> >   i just *know* i'm going to embarrass myself with this question, but
> > what is the difference between the addresses for a given symbol in
> > those two locations?
>
> Symbols, that are present in both must match. E.g.,
>
> $ grep jiffies_64 /proc/kallsyms
> c0122e00 T get_jiffies_64
> $ grep get_jiffies_64 /boot/System.map-2.6.16
> c0122e00 T get_jiffies_64
>
> >   specifically, i'm looking at a fedora 7 system running the latest
> > "yum updated" kernel 2.6.21-1.3228.fc7.  if i look at the System.map
> > file that came with it that's sitting in the /boot directory, that
> > tells me this:
> >
> > c130bc00 D jiffies
> >
> >   OTOH, if i check /proc/kallsyms, i'm told this:
> >
> > c070bc00 D jiffies
> >
> >   so how am i supposed to interpret that?
>
> Either you're looking at a wrong System.map or fedora guys have messed
> things up a bit...

i verified the above twice before posting, just because it looked so
strange.  the authoritative source would be, of course,
/proc/kallsyms.  i'll ask on the fedora list to see if someone has an
explanation.

rday
-- 
========================================================================
Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry
Waterloo, Ontario, CANADA

http://fsdev.net/wiki/index.php?title=Main_Page
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