linux-kernel - Re: [PATCH net-next v2 2/2] net: airoha: Use u64_stats_t with u64_stats

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Message-ID: <20260125163510.4c5ea4df@kernel.org>
Date: Sun, 25 Jan 2026 16:35:10 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: David Yang <mmyangfl@...il.com>
Cc: netdev@...r.kernel.org, Lorenzo Bianconi <lorenzo@...nel.org>, Andrew
 Lunn <andrew+netdev@...n.ch>, "David S. Miller" <davem@...emloft.net>, Eric
 Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v2 2/2] net: airoha: Use u64_stats_t with
 u64_stats_sync properly

On Mon, 26 Jan 2026 06:07:50 +0800 David Yang wrote:
> On 64bit arches, struct u64_stats_sync is empty and provides no help
> against load/store tearing. Convert to u64_stats_t to ensure atomic
> operations.

The driver takes a spin lock over the very expensive series
of register reads and then drops out to copy the just read
values? Just move the readers under the spinlock?