linux-kernel - [PATCH net 4/4] ARM: axm55xx_defconfig: Disable PHY time stamping by default.

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Date:   Wed, 20 Jan 2021 20:06:03 -0800
From:   Richard Cochran <richardcochran@...il.com>
To:     netdev@...r.kernel.org
Cc:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, Andrew Lunn <andrew@...n.ch>,
        Brandon Streiff <brandon.streiff@...com>,
        Dinh Nguyen <dinguyen@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Marc Zyngier <maz@...nel.org>, Olof Johansson <olof@...om.net>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH net 4/4] ARM: axm55xx_defconfig: Disable PHY time stamping by default.

The NETWORK_PHY_TIMESTAMPING configuration option adds overhead into
the networking stack.  When enabled, all transmitted and received
frames are subjected to extra tests to determine whether they just
might be PTP frames to be presented to esoteric PHY time stamping
drivers.

However, no System on Chip, least ways not the axm55xx SoC, includes
such a PHY time stamping device.  Disable the unneeded option by
default.

Signed-off-by: Richard Cochran <richardcochran@...il.com>
---
 arch/arm/configs/axm55xx_defconfig | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/arm/configs/axm55xx_defconfig b/arch/arm/configs/axm55xx_defconfig
index 46075216ee6d..2d1a45066649 100644
--- a/arch/arm/configs/axm55xx_defconfig
+++ b/arch/arm/configs/axm55xx_defconfig
@@ -73,7 +73,6 @@ CONFIG_INET_AH=y
 CONFIG_INET_ESP=y
 CONFIG_INET_IPCOMP=y
 # CONFIG_IPV6 is not set
-CONFIG_NETWORK_PHY_TIMESTAMPING=y
 CONFIG_BRIDGE=y
 # CONFIG_WIRELESS is not set
 CONFIG_DEVTMPFS=y
-- 
2.20.1