From: Masahiro Yamada <yamada.masahiro@socionext.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
Sam Ravnborg <sam@ravnborg.org>,
"open list:DOCUMENTATION" <linux-doc@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Jonathan Corbet <corbet@lwn.net>,
Michal Marek <michal.lkml@markovi.net>
Subject: Re: [PATCH 2/3] kbuild: generate asm-generic wrappers if mandatory headers are missing
Date: Tue, 11 Dec 2018 21:59:26 +0900 [thread overview]
Message-ID: <CAK7LNAS7hh4f8mYoZc7RUWStnchhftUN0nU5MJ_trjyNJx50Lw@mail.gmail.com> (raw)
In-Reply-To: <20181206150325.GA2726@infradead.org>
Hi Christoph,
On Fri, Dec 7, 2018 at 12:04 AM Christoph Hellwig <hch@infradead.org> wrote:
>
> On Wed, Dec 05, 2018 at 08:28:05PM +0900, Masahiro Yamada wrote:
> > Some time ago, Sam pointed out a certain degree of overwrap between
> > generic-y and mandatory-y. (https://lkml.org/lkml/2017/7/10/121)
> >
> > I a bit tweaked the meaning of mandatory-y; now it defines the minimum
> > set of ASM headers that all architectures must have.
> >
> > If arch does not have specific implementation of a mandatory header,
> > Kbuild will let it fallback to the asm-generic one by automatically
> > generating a wrapper. This will allow to drop lots of redundant
> > generic-y defines.
> >
> > Previously, "mandatory" was used in the context of UAPI, but I guess
> > this can be extended to kernel space ASM headers.
>
> How useful is it to keep the generic-y behavior around at all vs making
> everything useful mandatory?
What I can tell is not all architectures
support kvm_para.h, ucontext.h
I guess they will stay as arch-specific generic-y,
but I am not an expert in this area.
kvm_para.h is missing csky, nds32, riscv.
ucontext.h is missing in alpha, arm, m68k, parisc, sparc, xtensa
bpf_perf_event.h could be promoted to mandatory-y ?
All architectures have it.
--
Best Regards
Masahiro Yamada
next prev parent reply other threads:[~2018-12-11 13:00 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-05 11:28 [PATCH 1/3] kbuild: refactor Makefile.asm-generic Masahiro Yamada
2018-12-05 11:28 ` [PATCH 2/3] kbuild: generate asm-generic wrappers if mandatory headers are missing Masahiro Yamada
2018-12-06 15:03 ` Christoph Hellwig
2018-12-11 12:59 ` Masahiro Yamada [this message]
2018-12-11 16:29 ` Palmer Dabbelt
2018-12-06 18:04 ` Sam Ravnborg
2018-12-11 13:01 ` Masahiro Yamada
2018-12-16 15:24 ` [PATCH 1/3] kbuild: refactor Makefile.asm-generic Masahiro Yamada
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