Re: [PATCH nf] nft_set_pipapo_avx2: Add irq_fpu_usable() check, fallback to non-AVX2 version

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On Mon, May 10, 2021 at 07:58:22AM +0200, Stefano Brivio wrote:
> Arturo reported this backtrace:
> 
> [709732.358791] WARNING: CPU: 3 PID: 456 at arch/x86/kernel/fpu/core.c:128 kernel_fpu_begin_mask+0xae/0xe0
[...]
> 
> that is, nft_pipapo_avx2_lookup() uses the FPU running from a softirq
> that interrupted a kthread, also using the FPU.
> 
> That's exactly the reason why irq_fpu_usable() is there: use it, and
> if we can't use the FPU, fall back to the non-AVX2 version of the
> lookup operation, i.e. nft_pipapo_lookup().

Applied to nf, thanks.



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