On Thu, Sep 02, 2021 at 09:57:05AM -0700, Song Liu wrote:
> +BPF_CALL_3(bpf_get_branch_snapshot, void *, buf, u32, size, u64, flags)
> +{
> +#ifndef CONFIG_X86
> + return -ENOENT;
> +#else
> + static const u32 br_entry_size = sizeof(struct perf_branch_entry);
> + u32 entry_cnt = size / br_entry_size;
> +
> + if (unlikely(flags))
> + return -EINVAL;
> +
> + if (!buf || (size % br_entry_size != 0))
> + return -EINVAL;
> +
> + entry_cnt = static_call(perf_snapshot_branch_stack)(buf, entry_cnt);
> +
> + if (!entry_cnt)
> + return -ENOENT;
> +
> + return entry_cnt * br_entry_size;
> +#endif
> +}
Do we really need that CONFIG_X86 thing? Seems rather bad practise.
