On Tue, 2 Feb 2021 at 00:27, Alexei Starovoitov
wrote:
>
> On Mon, Feb 1, 2021 at 7:00 AM Brendan Jackman wrote:
> > +
> > +SEC("fentry/bpf_fentry_test1")
> > +int BPF_PROG(sub, int x)
> > +{
> > + int a = 0;
> > + int b = __sync_fetch_and_add(, 1);
>
> It probably needs
On Mon, Feb 1, 2021 at 7:00 AM Brendan Jackman wrote:
> +
> +SEC("fentry/bpf_fentry_test1")
> +int BPF_PROG(sub, int x)
> +{
> + int a = 0;
> + int b = __sync_fetch_and_add(, 1);
It probably needs ENABLE_ATOMICS_TESTS ?
Otherwise clang without -mcpu=v3 will complain:
"fatal error:
When BPF_FETCH is set, atomic instructions load a value from memory
into a register. The current verifier code first checks via
check_mem_access whether we can access the memory, and then checks
via check_reg_arg whether we can write into the register.
For loads, check_reg_arg has the side-effect
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