netdev - Re: [PATCH net-next v2] net: bpf: only build bpf_jit_binary

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Date:	Wed, 10 Sep 2014 10:48:54 -0700
From:	Cong Wang <cwang@...pensource.com>
To:	Daniel Borkmann <dborkman@...hat.com>
Cc:	David Miller <davem@...emloft.net>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Alexei Starovoitov <ast@...mgrid.com>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next v2] net: bpf: only build bpf_jit_binary_{alloc,free}()
 when jit selected

On Wed, Sep 10, 2014 at 6:01 AM, Daniel Borkmann <dborkman@...hat.com> wrote:
> Since BPF JIT depends on the availability of module_alloc() and
> module_free() helpers (HAVE_BPF_JIT and MODULES), we better build
> that code only in case we have BPF_JIT in our config enabled, just
> like with other JIT code. Fixes builds for arm/marzen_defconfig
> and sh/rsk7269_defconfig.

It is quite useful to include the build failure in changelog:

kernel/built-in.o: In function `bpf_jit_binary_alloc':
/home/cwang/linux/kernel/bpf/core.c:144: undefined reference to `module_alloc'
kernel/built-in.o: In function `bpf_jit_binary_free':
/home/cwang/linux/kernel/bpf/core.c:164: undefined reference to `module_free'
make: *** [vmlinux] Error 1
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