# \[PATCH v3 2/3\] bpf: define bpf\_jit\_alloc\_exec\_limit for arm64 JIT

- From: Lorenz Bauer \<hidden\>
- Date: 2021-10-14 14:26:12 
- List: netdev
- Page: https://ratatoskr.run/netdev/2021/10/1541966
- Thread: https://ratatoskr.run/netdev/2021/10/7782493/t.md

```text
Expose the maximum amount of useable memory from the arm64 JIT.

Signed-off-by: Lorenz Bauer <redacted>
---
 arch/arm64/net/bpf_jit_comp.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm64/net/bpf_jit_comp.c b/arch/arm64/net/bpf_jit_comp.c
index 41c23f474ea6..803e7773fa86 100644
--- a/arch/arm64/net/bpf_jit_comp.c
+++ b/arch/arm64/net/bpf_jit_comp.c
@@ -1136,6 +1136,11 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)
 	return prog;
 }
 
+u64 bpf_jit_alloc_exec_limit(void)
+{
+	return BPF_JIT_REGION_SIZE;
+}
+
 void *bpf_jit_alloc_exec(unsigned long size)
 {
 	return __vmalloc_node_range(size, PAGE_SIZE, BPF_JIT_REGION_START,
-- 
2.30.2

```