netdev - drivers/net/ethernet/mediatek/mtk_ppe_offload.c

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Date:   Sun, 18 Apr 2021 21:02:12 -0400
From:   "Valdis Klētnieks" <valdis.kletnieks@...edu>
To:     Felix Fietkau <nbd@....name>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        "David S. Miller" <davem@...emloft.net>
Cc:     Christoph Hellwig <hch@...radead.org>, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: drivers/net/ethernet/mediatek/mtk_ppe_offload.c - suspicious code?

While doing some code auditing for -Woverride_init, I spotted some questionable code

commit 502e84e2382d92654a2ecbc52cdbdb5a11cdcec7
Author: Felix Fietkau <nbd@....name>
Date:   Wed Mar 24 02:30:54 2021 +0100

    net: ethernet: mtk_eth_soc: add flow offloading support

In drivers/net/ethernet/mediatek/mtk_ppe_offload.c:

+static const struct rhashtable_params mtk_flow_ht_params = {
+       .head_offset = offsetof(struct mtk_flow_entry, node),
+       .head_offset = offsetof(struct mtk_flow_entry, cookie),
+       .key_len = sizeof(unsigned long),
+       .automatic_shrinking = true,
+};

What's intended for head_offset here?

Christoph:  This was the only actual questionable code caught by override-init
across allmodconfig builds of arm, arm64, and x86_64. The other 218 warnings
not already silenced by Makefile twiddling of CFLAGS are all legitimate. I
admit not being sure what that means for its use in W=1 builds in general.


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