riscv, bpf: Remove BPF JIT for nommu builds

The BPF JIT fails to build for kernels configured to !MMU. Without an
MMU, the BPF JIT does not make much sense, therefore this patch
disables the JIT for nommu builds.

This was reported by the kbuild test robot:

   All errors (new ones prefixed by >>):

      arch/riscv/net/bpf_jit_comp64.c: In function 'bpf_jit_alloc_exec':
   >> arch/riscv/net/bpf_jit_comp64.c:1094:47: error: 'BPF_JIT_REGION_START' undeclared (first use in this function)
       1094 |  return __vmalloc_node_range(size, PAGE_SIZE, BPF_JIT_REGION_START,
            |                                               ^~~~~~~~~~~~~~~~~~~~
      arch/riscv/net/bpf_jit_comp64.c:1094:47: note: each undeclared identifier is reported only once for each function it appears in
   >> arch/riscv/net/bpf_jit_comp64.c:1095:9: error: 'BPF_JIT_REGION_END' undeclared (first use in this function)
       1095 |         BPF_JIT_REGION_END, GFP_KERNEL,
            |         ^~~~~~~~~~~~~~~~~~
      arch/riscv/net/bpf_jit_comp64.c:1098:1: warning: control reaches end of non-void function [-Wreturn-type]
       1098 | }
            | ^

Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Björn Töpel <bjorn.topel@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Luke Nelson <luke.r.nels@gmail.com>
Link: https://lore.kernel.org/bpf/20200331101046.23252-1-bjorn.topel@gmail.com

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 8672e77..bd35ac7 100644 (file)
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -55,7 +55,7 @@ config RISCV
        select ARCH_HAS_PTE_SPECIAL
        select ARCH_HAS_MMIOWB
        select ARCH_HAS_DEBUG_VIRTUAL
-       select HAVE_EBPF_JIT
+       select HAVE_EBPF_JIT if MMU
        select EDAC_SUPPORT
        select ARCH_HAS_GIGANTIC_PAGE
        select ARCH_WANT_HUGE_PMD_SHARE if 64BIT