linux-kernel - Re: [PATCH 5.15 154/779] netfilter: nf_tables: add rescheduling points during loop detection walks

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Date:   Mon, 15 Aug 2022 20:58:22 +0200
From:   Florian Westphal <fw@...len.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Florian Westphal <fw@...len.de>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 5.15 154/779] netfilter: nf_tables: add rescheduling
 points during loop detection walks

Greg Kroah-Hartman <gregkh@...uxfoundation.org> wrote:
> From: Florian Westphal <fw@...len.de>
> 
> [ Upstream commit 81ea010667417ef3f218dfd99b69769fe66c2b67 ]
> 
> Add explicit rescheduling points during ruleset walk.

NAK.  There is a partial revert pending.

> @@ -9225,9 +9227,13 @@ static int nf_tables_check_loops(const struct nft_ctx *ctx,
>  				break;
>  			}
>  		}
> +
> +		cond_resched();
>  	}
>  
>  	list_for_each_entry(set, &ctx->table->sets, list) {
> +		cond_resched();

Can't be used here, this can be called from atomic context.