linux-kernel - RE: [PATCH] arm: Silence gcc warnings about arch ABI drift

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Message-ID: <c479e2727e4e49739d86b8e2b0b0a221@AcuMS.aculab.com>
Date: Mon, 19 Feb 2024 22:04:20 +0000
From: David Laight <David.Laight@...LAB.COM>
To: 'Kent Overstreet' <kent.overstreet@...ux.dev>
CC: "Russell King (Oracle)" <linux@...linux.org.uk>, Arnd Bergmann
	<arnd@...db.de>, Calvin Owens <jcalvinowens@...il.com>, Dave Martin
	<Dave.Martin@....com>, "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "linux-bcachefs@...r.kernel.org"
	<linux-bcachefs@...r.kernel.org>
Subject: RE: [PATCH] arm: Silence gcc warnings about arch ABI drift

From: Kent Overstreet
> Sent: 19 February 2024 21:38
> 
> On Mon, Feb 19, 2024 at 07:53:15PM +0000, David Laight wrote:
> > ...
> > > I'm not always trying to write code that will generate the fastest
> > > assembly possible; there aro other considerations. As long a the
> > > compiler is doing something /reasonable/, the code is fine.
> >
> > Speaks the man who was writing horrid 'jit' code ...
> >
> > This also begs the question of why that data is so compressed
> > in the first place?
> > It is quite likely that a few accesses generate far more code
> > than the data you are attempting to save.
> 
> It's easy to understand if you understand profiling, benchmarking and
> cache effects.

And how arguments get passed to functions :-)

	David

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