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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Message-ID: <CALCETrUY80kQ3yiBYn29jZyeZx=P9ZsA+eiq-5kgqLOMiSZJ9g@mail.gmail.com>
Date:	Wed, 3 Jun 2015 10:22:01 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Ingo Molnar <mingo@...nel.org>
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/

On Wed, Jun 3, 2015 at 10:16 AM, 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 ;-) ]
>

I'm convinced.  If "entry" means entry into code provided by the
kernel as opposed to entry via hardware-provided entry mechanism, then
the vdso is indeed a pile of entries into the kernel.

--Andy

> Thanks,
>
>         Ingo



-- 
Andy Lutomirski
AMA Capital Management, LLC
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