linux-kernel - Re: [PATCH v4 6/6] Add Propeller configuration for kernel build.

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Message-ID: <CAF1bQ=Rc_0xwq+7njaTf1EdsO0fyyKhcvMkC9AqcMf0mFsOt8Q@mail.gmail.com>
Date: Wed, 23 Oct 2024 09:23:14 -0700
From: Rong Xu <xur@...gle.com>
To: Masahiro Yamada <masahiroy@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>, Alice Ryhl <aliceryhl@...gle.com>, 
	Andrew Morton <akpm@...ux-foundation.org>, Bill Wendling <morbo@...gle.com>, 
	Borislav Petkov <bp@...en8.de>, Breno Leitao <leitao@...ian.org>, Brian Gerst <brgerst@...il.com>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, David Li <davidxl@...gle.com>, 
	Han Shen <shenhan@...gle.com>, Heiko Carstens <hca@...ux.ibm.com>, "H. Peter Anvin" <hpa@...or.com>, 
	Ingo Molnar <mingo@...hat.com>, Jann Horn <jannh@...gle.com>, Jonathan Corbet <corbet@....net>, 
	Josh Poimboeuf <jpoimboe@...nel.org>, Juergen Gross <jgross@...e.com>, 
	Justin Stitt <justinstitt@...gle.com>, Kees Cook <kees@...nel.org>, 
	Mike Rapoport <rppt@...nel.org>, Nathan Chancellor <nathan@...nel.org>, 
	Nick Desaulniers <ndesaulniers@...gle.com>, Nicolas Schier <nicolas@...sle.eu>, 
	"Paul E. McKenney" <paulmck@...nel.org>, Peter Zijlstra <peterz@...radead.org>, 
	Sami Tolvanen <samitolvanen@...gle.com>, Thomas Gleixner <tglx@...utronix.de>, 
	Wei Yang <richard.weiyang@...il.com>, workflows@...r.kernel.org, 
	Miguel Ojeda <miguel.ojeda.sandonis@...il.com>, Maksim Panchenko <max4bolt@...il.com>, x86@...nel.org, 
	Linux-Arch <linux-arch@...r.kernel.org>, linux-doc@...r.kernel.org, 
	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org, 
	llvm@...ts.linux.dev, Sriraman Tallam <tmsriram@...gle.com>, 
	Krzysztof Pszeniczny <kpszeniczny@...gle.com>, Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v4 6/6] Add Propeller configuration for kernel build.

While Propeller often works best with AutoFDO (or the instrumentation
based FDO), it's not required. One can use Propeller (or similar
post-link-optimizer, like Bolt) on plain kernel builds.

So I will remove "depends on AUTOFDO_CLANG". I will not use "imply" --
simpler is better here.

-Rong

On Wed, Oct 23, 2024 at 12:29 AM Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> On Wed, Oct 23, 2024 at 4:25 PM Arnd Bergmann <arnd@...db.de> wrote:
> >
> > On Wed, Oct 23, 2024, at 07:06, Masahiro Yamada wrote:
> > > On Tue, Oct 22, 2024 at 9:00 AM Rong Xu <xur@...gle.com> wrote:
> > >
> > >> > > +===========
> > >> > > +
> > >> > > +Configure the kernel with::
> > >> > > +
> > >> > > +   CONFIG_AUTOFDO_CLANG=y
> > >> >
> > >> >
> > >> > This is automatically met due to "depends on AUTOFDO_CLANG".
> > >>
> > >> Agreed. But we will remove the dependency from PROPELlER_CLANG to AUTOFDO_CLANG.
> > >> So we will keep the part.
> > >
> > >
> > > You can replace "depends on AUTOFDO_CLANG" with
> > > "imply AUTOFDO_CLANG" if it is sensible.
> > >
> > > Up to you.
> >
> > I don't think we should ever encourage the use of 'imply'
> > because it is almost always used incorrectly.
>
> If we are able to delete the 'imply' keyword, Kconfig would be a bit cleaner.
>
> In most cases, it can be replaced with 'default'.
>
>
>
> --
> Best Regards
> Masahiro Yamada