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Date:   Tue, 12 May 2020 10:03:06 -0700
From:   Yonghong Song <>
To:     Lorenzo Bianconi <>, <>,
CC:     <>, <>, <>,
        <>, <>
Subject: Re: [PATCH bpf-next v2] samples/bpf: xdp_redirect_cpu: set MAX_CPUS
 according to NR_CPUS

On 5/12/20 9:30 AM, Lorenzo Bianconi wrote:
> xdp_redirect_cpu is currently failing in bpf_prog_load_xattr()
> allocating cpu_map map if CONFIG_NR_CPUS is less than 64 since
> cpu_map_alloc() requires max_entries to be less than NR_CPUS.
> Set cpu_map max_entries according to NR_CPUS in xdp_redirect_cpu_kern.c
> and get currently running cpus in xdp_redirect_cpu_user.c
> Signed-off-by: Lorenzo Bianconi <>

Acked-by: Yonghong Song <>

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