* [PATCH bpf] riscv: remove BPF JIT for nommu builds
@ 2020-03-31 10:10 Björn Töpel
2020-03-31 14:57 ` Luke Nelson
2020-04-02 22:51 ` Daniel Borkmann
0 siblings, 2 replies; 3+ messages in thread
From: Björn Töpel @ 2020-03-31 10:10 UTC (permalink / raw)
To: netdev, bpf, ast, daniel
Cc: Björn Töpel, linux-riscv, Damien.LeMoal, hch,
kbuild test robot
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>
---
arch/riscv/Kconfig | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 8672e77a5b7a..bd35ac72fe24 100644
--- 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
--
2.20.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH bpf] riscv: remove BPF JIT for nommu builds
2020-03-31 10:10 [PATCH bpf] riscv: remove BPF JIT for nommu builds Björn Töpel
@ 2020-03-31 14:57 ` Luke Nelson
2020-04-02 22:51 ` Daniel Borkmann
1 sibling, 0 replies; 3+ messages in thread
From: Luke Nelson @ 2020-03-31 14:57 UTC (permalink / raw)
To: Björn Töpel
Cc: Netdev, bpf, Alexei Starovoitov, Daniel Borkmann, linux-riscv,
Damien.LeMoal, hch, kbuild test robot
Thanks for looking into this!
Acked-by: Luke Nelson <luke.r.nels@gmail.com>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH bpf] riscv: remove BPF JIT for nommu builds
2020-03-31 10:10 [PATCH bpf] riscv: remove BPF JIT for nommu builds Björn Töpel
2020-03-31 14:57 ` Luke Nelson
@ 2020-04-02 22:51 ` Daniel Borkmann
1 sibling, 0 replies; 3+ messages in thread
From: Daniel Borkmann @ 2020-04-02 22:51 UTC (permalink / raw)
To: Björn Töpel, netdev, bpf, ast
Cc: linux-riscv, Damien.LeMoal, hch, kbuild test robot
On 3/31/20 12:10 PM, Björn Töpel wrote:
> 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>
Applied, thanks!
^ permalink raw reply [flat|nested] 3+ messages in thread
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2020-03-31 14:57 ` Luke Nelson
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