Messages in this thread | | | Date | Wed, 29 Sep 2021 17:18:04 +0100 | From | Will Deacon <> | Subject | Re: [PATCH bpf-next 2/4] bpf: define bpf_jit_alloc_exec_limit for arm64 JIT |
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On Fri, Sep 24, 2021 at 10:55:40AM +0100, Lorenz Bauer wrote: > Expose the maximum amount of useable memory from the arm64 JIT. > > Signed-off-by: Lorenz Bauer <lmb@cloudflare.com> > --- > 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
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