linux-kernel - Re: [PATCH 2/3] kbuild: generate asm-generic wrappers if mandatory headers are missing

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Date:   Tue, 11 Dec 2018 21:59:26 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Sam Ravnborg <sam@...nborg.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Jonathan Corbet <corbet@....net>,
        Michal Marek <michal.lkml@...kovi.net>
Subject: Re: [PATCH 2/3] kbuild: generate asm-generic wrappers if mandatory
 headers are missing

Hi Christoph,


On Fri, Dec 7, 2018 at 12:04 AM Christoph Hellwig <hch@...radead.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