linux-kernel - Re: [PATCH 02/10] compiler.h: add is_const() as a replacement of __is

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Message-ID: <429e7c6713ecc94494d9107e5f5a1f0c8e854f23.camel@gwdg.de>
Date: Sat, 7 Dec 2024 14:18:51 +0100
From: Martin Uecker <muecker@...g.de>
To: Vincent Mailhol <vincent.mailhol@...il.com>
CC: David Laight <David.Laight@...lab.com>, Linus Torvalds
	<torvalds@...ux-foundation.org>, Luc Van Oostenryck
	<luc.vanoostenryck@...il.com>, Nathan Chancellor <nathan@...nel.org>, "Nick
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Subject: Re: [PATCH 02/10] compiler.h: add is_const() as a replacement of
 __is_constexpr()

Am Samstag, dem 07.12.2024 um 21:45 +0900 schrieb Vincent Mailhol:
> On Sat. 7 Dec. 2024 at 17:39, Martin Uecker <muecker@...g.de> wrote:
> > Am Freitag, dem 06.12.2024 um 16:26 +0900 schrieb Vincent Mailhol:

...

> > I find it amazing how much time the Linux kernel community spends
> > revising code to make it work perfectly.
> > 
> > Still, I am wondering whether some of this time and effort should not
> > be targeted at C compilers and language work to make these macro
> > hacks unnecessary?
> 
> It seems to me that the long term solution to this problem are the
> constexpr functions.

How would constexpr functions help here?  (I am a bit sceptical about
constexpr functions.)

> 
> But the core issue is that before getting this support in Linux, we
> have to wait for this to be added to the C2Y draft, then implemented
> in the compilers (probably just reusing the C++ constexpr functions)
> and finally wait maybe one more decade for the C2Y support to reach
> the kernel. For reference the kernel supports C11 only from 2022… So
> maybe we will see those in the kernel around 2037? Meanwhile, we have
> to deal with those hacks.

If we do not collaborate on proper solutions, then you might have 
to wait much longer.

Martin


> 
> 
> Yours sincerely,
> Vincent Mailhol