linux-kernel - [PATCH 5.14 078/849] bpf: Define bpf_jit_alloc_exec

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Date:   Mon, 15 Nov 2021 17:52:41 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Lorenz Bauer <lmb@...udflare.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Luke Nelson <luke.r.nels@...il.com>,
        Björn Töpel <bjorn@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.14 078/849] bpf: Define bpf_jit_alloc_exec_limit for riscv JIT

From: Lorenz Bauer <lmb@...udflare.com>

[ Upstream commit 8f04db78e4e36a5d4858ce841a3e9cc3d69bde36 ]

Expose the maximum amount of useable memory from the riscv JIT.

Signed-off-by: Lorenz Bauer <lmb@...udflare.com>
Signed-off-by: Alexei Starovoitov <ast@...nel.org>
Acked-by: Luke Nelson <luke.r.nels@...il.com>
Acked-by: Björn Töpel <bjorn@...nel.org>
Link: https://lore.kernel.org/bpf/20211014142554.53120-2-lmb@cloudflare.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/riscv/net/bpf_jit_core.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/riscv/net/bpf_jit_core.c b/arch/riscv/net/bpf_jit_core.c
index 5d247198c30d3..753d85bdfad07 100644
--- a/arch/riscv/net/bpf_jit_core.c
+++ b/arch/riscv/net/bpf_jit_core.c
@@ -167,6 +167,11 @@ out:
 	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,
-- 
2.33.0