linux-kernel - Re: [PATCH net-next 08/30] net: dsa: mt7530: change p{5,6}_interface to p{5,6}

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Date: Wed, 10 Jan 2024 20:05:25 +0200
From: Vladimir Oltean <olteanv@...il.com>
To: Arınç ÜNAL <arinc.unal@...nc9.com>
Cc: "Russell King (Oracle)" <linux@...linux.org.uk>,
	Sean Wang <sean.wang@...iatek.com>,
	Landen Chao <Landen.Chao@...iatek.com>,
	DENG Qingfang <dqfext@...il.com>,
	Daniel Golle <daniel@...rotopia.org>, Andrew Lunn <andrew@...n.ch>,
	Florian Fainelli <f.fainelli@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Richard van Schagen <richard@...terhints.com>,
	Richard van Schagen <vschagen@...com>,
	Frank Wunderlich <frank-w@...lic-files.de>,
	Bartel Eerdekens <bartel.eerdekens@...stell8.be>,
	erkin.bozoglu@...ont.com, mithat.guner@...ont.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH net-next 08/30] net: dsa: mt7530: change p{5,6}_interface
 to p{5,6}_configured

On Wed, Jan 10, 2024 at 08:15:20PM +0300, Arınç ÜNAL wrote:
> __builtin_return_address(1) doesn't seem to work. I'm running this on arm64.

I can't tell you why either, I'm sorry. I can just point to the
documentation, which does specify that "On some machines it may be
impossible to determine the return address of any function other than
the current one". If somebody knows what this depends on, feel free to
interject.
https://gcc.gnu.org/onlinedocs/gcc/Return-Address.html

On my NXP LS1028A (also arm64) plus clang-16 compiler, __builtin_return_address()
does work with multiple nesting levels.

> This is very helpful, thank you very much. This is what I deduct I should
> do:
> 
> First patch: Get rid of cpu_port_config().
> 
> Second patch: Collect port link control register operations from
> port_enable/port_disable and phylink_mac_config to
> phylink_mac_link_up/phylink_mac_link_down.

I guess. Sounds good.