Re: [PATCH 0000/2297] [ANNOUNCE, RFC] "Fast Kernel Headers" Tree -v1: Eliminate the Linux kernel's "Dependency Hell"

[Andy Shevchenko]

On Sun, Jan 02, 2022 at 10:57:35PM +0100, Ingo Molnar wrote:
> 
> I'm pleased to announce the first public version of my new "Fast Kernel 
> Headers" project that I've been working on since late 2020, which is a 
> comprehensive rework of the Linux kernel's header hierarchy & header 
> dependencies, with the dual goals of:
> 
>  - speeding up the kernel build (both absolute and incremental build times)
> 
>  - decoupling subsystem type & API definitions from each other
> 
> The fast-headers tree consists of over 25 sub-trees internally, spanning 
> over 2,200 commits, which can be found here:
> 
>    git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git master
> 
> As most kernel developers know, there's around ~10,000 main .h headers in 
> the Linux kernel, in the include/ and arch/*/include/ hierarchies. Over the 
> last 30+ years they have grown into a complicated & painful set of 
> cross-dependencies we are affectionately calling 'Dependency Hell'.

In the 64e013748e61 ("headers/deps: Optimize <linux/kernel.h>")
the linux/container_of.h and linux/stdarg.h are moved around (in the
linux/kernel.h) without any explanation in the commit message. Is it
necessary? If so, can you add a background note.

-- 
With Best Regards,
Andy Shevchenko