Re: [PATCH bpf-next 2/4] bpf: define bpf_jit_alloc_exec_limit for arm64 JIT
From: Will Deacon <will@kernel.org>
Date: 2021-09-29 16:18:17
Also in:
linux-arm-kernel, lkml, netdev
On Fri, Sep 24, 2021 at 10:55:40AM +0100, Lorenz Bauer wrote:
quoted hunk ↗ jump to hunk
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; +}
Looks like this won't result in a functional change, as we happen to return SZ_128M anyway thanks to the way in which the modules area is constructed. But making this explicit is definitely better, so: Acked-by: Will Deacon <will@kernel.org> (I'm assuming this will go via the bpf tree, but please shout if I should take it via arm64 instead) Will