After patching from 2.4.3 to 2.4.4-pre1 my reiserfs volumes failed to mount.
I checked that reiserfs was included and tried to load the module manualy. This gave this result:
lib/modules/2.4.4-pre1/kernel/fs/reiserfs/reiserfs.o: unresolved symbol strstr
/lib/modules/2.4.4-pre1/kernel/fs/reiserfs/reiserfs.o: insmod /lib/modules/2.4.4-pre1/kernel/fs/reiserfs/reiserfs.o failed
/lib/modules/2.4.4-pre1/kernel/fs/reiserfs/reiserfs.o: insmod reiserfs failed