dkms build problem

[Andreas Philipp <philipp.andreas@gmail.com>]

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Hi,

I tried to follow this howto
https://btrfs.wiki.kernel.org/index.php/Btrfs_source_repositories#Building_latest_btrfs_against_a_recent_kernel_with_DKMS
from the btrfs wiki to build my own btrfs module using dkms  on my
gentoo running kernel version 2.6.35.7.
But when trying to build the dkms module I have run into the following
compile error; see my make.log below. If you have any suggestions on
what I should try to fix this, i.e., other kernel version(s), patches
to kernel/btrfs-unstable, other compiler version(s), and so on, I am
willing to try out everything in order to help fix this. If this is a
known error, and the decision is to not fix it, as btrfs compiles well
within the regular kernel sources from kernel.org, then I would add a
comment about that in the corresponding section of the btrfs wiki.

Kind regards,
Andreas Philipp

make.log:
DKMS make.log for btrfs-git for kernel 2.6.35.7 (x86_64)
Sun Oct 17 16:35:28 CEST 2010
make: Entering directory `/usr/src/linux-2.6.35.7'
  LD      /var/lib/dkms/btrfs/git/build/built-in.o
  CC [M]  /var/lib/dkms/btrfs/git/build/super.o
/var/lib/dkms/btrfs/git/build/super.c: In function ?btrfs_fill_super?:
/var/lib/dkms/btrfs/git/build/super.c:448: warning: assignment from
incompatible pointer type
  CC [M]  /var/lib/dkms/btrfs/git/build/ctree.o
  CC [M]  /var/lib/dkms/btrfs/git/build/extent-tree.o
/var/lib/dkms/btrfs/git/build/extent-tree.c: In function
?btrfs_issue_discard?:
/var/lib/dkms/btrfs/git/build/extent-tree.c:1699: error:
?DISCARD_FL_BARRIER? undeclared (first use in this function)
/var/lib/dkms/btrfs/git/build/extent-tree.c:1699: error: (Each
undeclared identifier is reported only once
/var/lib/dkms/btrfs/git/build/extent-tree.c:1699: error: for each
function it appears in.)
make[1]: *** [/var/lib/dkms/btrfs/git/build/extent-tree.o] Error 1
make: *** [_module_/var/lib/dkms/btrfs/git/build] Error 2
make: Leaving directory `/usr/src/linux-2.6.35.7'
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