Re: [PATCH v2 bpf-next 13/20] libbpf: Allow specifying 64-bit integers in map BTF.

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On Thu, 2024-02-08 at 20:06 -0800, Alexei Starovoitov wrote:
> From: Alexei Starovoitov <ast@xxxxxxxxxx>
> 
> __uint() macro that is used to specify map attributes like:
>   __uint(type, BPF_MAP_TYPE_ARRAY);
>   __uint(map_flags, BPF_F_MMAPABLE);
> is limited to 32-bit, since BTF_KIND_ARRAY has u32 "number of elements" field.
> 
> Introduce __ulong() macro that allows specifying values bigger than 32-bit.
> In map definition "map_extra" is the only u64 field.
> 
> Signed-off-by: Alexei Starovoitov <ast@xxxxxxxxxx>
> ---

Acked-by: Eduard Zingerman <eddyz87@xxxxxxxxx>

Another option would be something like:

    #define __ulong(name, val) int (*name)[val >> 32][(val << 32) >> 32]

thus avoiding generation of __unique_value_123 literals,
but these literals probably should not be an issue.






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