linux-kernel - Re: [RFC PATCH 0/7] x86/entry: Create a home for the x86 entry code in arch/x86/entry/

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Date:	Wed, 3 Jun 2015 19:29:10 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Brian Gerst <brgerst@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Borislav Petkov <bp@...en8.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC PATCH 0/7] x86/entry: Create a home for the x86 entry code
 in arch/x86/entry/


* Andy Lutomirski <luto@...capital.net> wrote:

> On Wed, Jun 3, 2015 at 10:21 AM, Ingo Molnar <mingo@...nel.org> wrote:
> >
> > * Ingo Molnar <mingo@...nel.org> wrote:
> >
> >>
> >> * Andy Lutomirski <luto@...capital.net> wrote:
> >>
> >> > On Wed, Jun 3, 2015 at 10:11 AM, Ingo Molnar <mingo@...nel.org> wrote:
> >> > >
> >> > > * H. Peter Anvin <hpa@...or.com> wrote:
> >> > >
> >> > >> I like the patch set (and you can add my Acked-by:) *except* 7/7, and the reason
> >> > >> for that is that it really isn't entry code, it is user space code.
> >> > >
> >> > > Well, I think arch/x86/entry/ should be a broader category for all things entry
> >> > > code: and the vsyscall code is closely related to the syscall entry/exit code so
> >> > > it's in a better place there than just being in the generic arch/x86/kernel/
> >> > > directory.
> >> > >
> >> > > I kept it separate in arch/x86/entry/vsyscall/ so it doesn't mix with other entry
> >> > > code.
> >> >
> >> > ...and my reading comprehension is way off this morning.  You already called it
> >> > arch/x86/entry, so there was no reason for me to suggest that :)
> >> >
> >> > Anyway, arch/x86/entry/vdso isn't so bad.  It's just a bit odd sounding to me.
> >>
> >> We could make it arch/x86/sys/? Sounds a bit too generic though.
> >>
> >> Didn't want to limit it to system calls only, because there's various other
> >> entry methods (irqs, traps, NMI, etc.) that we want to handle in a coherent
> >> fashion. [ Which you are intimately aware of ;-) ]
> >
> > Another tweak would be to move the kernel side entry code into
> > arch/x86/entry/system/ or so, to create the following organization:
> >
> >     arch/x86/entry:            all things entry methods
> >
> >     arch/x86/entry/system/:    system/kernel mode entry code
> >     arch/x86/entry/vdso/:      user mode entry code
> >     arch/x86/entry/vsyscall/:  [legacy vsyscall entry code]
> >
> >     arch/x86/entry/syscalls/:  build-time syscall table generation code
> >
> > My primary goal is to have them all close to each other, so that we can have
> > better structure, more coherency and easier overview. The names are negotiable,
> > the concept is not ;-)
> 
> I think I like the approach in the patches you sent better.

Ok.

> Once this is in, I'll rebase my code movement change and send it,

Sounds good to me!

> although I probably won't call the result arch/x86/entry/entry.c :)

A few naming suggestions:

   arch/x86/entry/core.c
   arch/x86/entry/sys.c
   arch/x86/entry/kernel.c

;-)

Note ... I'd love to split up the various entry methods into separate files - but 
will do that only on top of your C based bits.

And once that is done, the names of those files will be obvious and clean:

   arch/x86/entry/syscall.c
   arch/x86/entry/irq.c
   arch/x86/entry/traps.c
   arch/x86/entry/nmi.c
   arch/x86/entry/et.c

> And then it'll be back to grumbling at context tracking.

Uh oh ...

Thanks,

	Ingo
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