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

[Johan Hovold <johan@kernel.org>]

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