linux/kernel/bpf
Daniel Borkmann 3ba67dabaa ebpf: bpf_map_*: fix linker error on avr32 and openrisc arch
Fengguang reported, that on openrisc and avr32 architectures, we
get the following linker errors on *_defconfig builds that have
no bpf syscall support:

  net/built-in.o:(.rodata+0x1cd0): undefined reference to `bpf_map_lookup_elem_proto'
  net/built-in.o:(.rodata+0x1cd4): undefined reference to `bpf_map_update_elem_proto'
  net/built-in.o:(.rodata+0x1cd8): undefined reference to `bpf_map_delete_elem_proto'

Fix it up by providing built-in weak definitions of the symbols,
so they can be overridden when the syscall is enabled. I think
the issue might be that gcc is not able to optimize all that away.
This patch fixes the linker errors for me, tested with Fengguang's
make.cross [1] script.

  [1] https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Fixes: d4052c4aea ("ebpf: remove CONFIG_BPF_SYSCALL ifdefs in socket filter code")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-03-06 21:50:55 -05:00
..
arraymap.c ebpf: constify various function pointer structs 2015-03-01 14:05:18 -05:00
core.c ebpf: bpf_map_*: fix linker error on avr32 and openrisc arch 2015-03-06 21:50:55 -05:00
hashtab.c ebpf: constify various function pointer structs 2015-03-01 14:05:18 -05:00
helpers.c ebpf: constify various function pointer structs 2015-03-01 14:05:18 -05:00
Makefile ebpf: remove kernel test stubs 2015-03-01 14:05:18 -05:00
syscall.c cls_bpf: add initial eBPF support for programmable classifiers 2015-03-01 14:05:19 -05:00
verifier.c ebpf: move read-only fields to bpf_prog and shrink bpf_prog_aux 2015-03-01 14:05:19 -05:00