Subject: Re: linux-next: build failure after merge of the bfp-next tree

From: Alan Maguire <[email-masked]>
Date: Mon, 27 Apr 2026 14:45:43 +0100

On 27/04/2026 14:26, Thierry Reding wrote:
> Hi all,
> 
> After merging the bfp-next tree, today's linux-next build (x86_64
> allmodconfig ) failed like this:
> 
>     ERROR: modpost: "cnum64_umin" [drivers/net/ethernet/netronome/nfp/nfp.ko] undefined!
>     ERROR: modpost: "cnum64_umax" [drivers/net/ethernet/netronome/nfp/nfp.ko] undefined!
> 
> Caused by commit
> 
>     b93f7180f0bc ("bpf: use accessor functions for bpf_reg_state min/max fields")
> 
> It looks like the issue here is that these new accessor functions are not
> exported symbols and therefore can't be used by a driver that is built as
> a module.
>

See [1] for a proposed fix; thanks for reporting this!

[1] https://lore.kernel.org/bpf/[email-masked]/
 
> I've used the previous tree for today's linux-next.
> 
> Thanks,
> Thierry
>