linux-kernel - Re: [PATCH v3 0/4] tty: TX helpers

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Date:   Fri, 9 Sep 2022 14:23:10 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc:     Jiri Slaby <jirislaby@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-serial <linux-serial@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Tobias Klauser <tklauser@...tanz.ch>,
        Richard Genoud <richard.genoud@...il.com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        Vladimir Zapolskiy <vz@...ia.com>,
        Liviu Dudau <liviu.dudau@....com>,
        Sudeep Holla <sudeep.holla@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Andreas Färber <afaerber@...e.de>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Florian Fainelli <f.fainelli@...il.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Pali Rohár <pali@...nel.org>,
        Kevin Cernekee <cernekee@...il.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang7@...il.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        Patrice Chotard <patrice.chotard@...s.st.com>,
        linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v3 0/4] tty: TX helpers

On Wed, Sep 07, 2022 at 01:16:23PM +0300, Ilpo Järvinen wrote:

> Also, I don't understand why you see it unreadable when the actual code is 
> out in the open in that macro. It's formatted much better than e.g. 
> read_poll_timeout() if you want an example of something that is hardly 
> readable ;-). I agree though there's a learning-curve, albeit small, that 
> it actually creates a function but that doesn't seem to me as big of an 
> obstacle you seem to think.

There's a huge difference between the proposed macro with its
I-lost-count-of-how-many arguments and levels of indirection and
something like wait_event() which take one condition and has a
descriptive name:

	wait_event(device->misc_wait, atomic_read(&device->ap_pending_cnt) == 0);

vs

	static DEFINE_UART_PORT_TX_HELPER_LIMITED(altera_jtaguart_do_tx_chars,
		true,
		writel(ch, port->membase + ALTERA_JTAGUART_DATA_REG),
		({}));

In the former case, you just need to look at the code to understand what
is going on, very much unlike in the latter case.

Johan