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DateMon, 10 Nov 2003 15:30:06 -0800
FromJeff Bowden <>
Subjectpercpu_counter_mod not getting into SMP kernel image when ext2/3 compiled as modules
In 2.6.9-test9 (also tried with bk15) I have ext2 and ext3 both 
configured as modules. When I do "modprobe ext3" it says:

FATAL: Error inserting ext3
(/lib/modules/2.6.0-test9-bug-t1/kernel/fs/ext3/ext3.ko): Unknown symbol
in module, or unknown parameter (see dmesg)

and dmesg says:

ext3: Unknown symbol percpu_counter_mod

I found one message in the archive
(http://www.ussg.iu.edu/hypermail/linux/kernel/0310.2/0311.html) which
mentions this problem and includes a proposed fix. The lines from the
this proposal made it into lib/percpu_counter.c but somehow it seems
that they are not causing the symbol to end up in the main kernel
image. In fact the string "percpu_counter_mod" does not occur in
vmlinux or in any of the modules other than ext2.ko and ext3.ko.

The kernel in question was compiled with gcc 3.3.1 on an up-to-date
debian/unstable. A copy of the exact .config I used can be had from
http://jlb.changelog.com/config-2.6.0-test9-bug-t1

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