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

- Subsystems: ARM64 PORT (AARCH64 ARCHITECTURE), BPF JIT for ARM64, BPF \[GENERAL\] (Safe Dynamic Programs and Tools), THE REST
- Maintainers: Catalin Marinas, Will Deacon, Daniel Borkmann, Alexei Starovoitov, Puranjay Mohan, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Linus Torvalds
- Status: LANDED (5d63ae908242 · 2021-10-23 00:23)
- Landed in mainline as 5d63ae908242 on 2021-10-23.
- Revision v3 (3 revisions archived).
- List: linux-arm-kernel
- 1 message, 1 author
- Page: https://ratatoskr.run/linux-arm-kernel/2021/10/1541966/t

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

- From: Lorenz Bauer \<hidden\>
- Date: 2021-10-14 14:26:12 
- Message: https://ratatoskr.run/linux-arm-kernel/2021/10/1541966.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


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```