linux-kernel - Re: [PATCH v2 0/4] Intel MPX support

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Message-ID: <20140122123059.GA8973@gmail.com>
Date:	Wed, 22 Jan 2014 13:30:59 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	"Ren, Qiaowei" <qiaowei.ren@...el.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH v2 0/4] Intel MPX support


* Ren, Qiaowei <qiaowei.ren@...el.com> wrote:

> 
> 
> > -----Original Message-----
> > From: Ingo Molnar [mailto:mingo.kernel.org@...il.com] On Behalf Of Ingo
> > Molnar
> > Sent: Wednesday, January 22, 2014 7:53 PM
> > To: Ren, Qiaowei
> > Cc: H. Peter Anvin; Thomas Gleixner; Ingo Molnar; x86@...nel.org;
> > linux-kernel@...r.kernel.org; Peter Zijlstra
> > Subject: Re: [PATCH v2 0/4] Intel MPX support
> > 
> > 
> > * Qiaowei Ren <qiaowei.ren@...el.com> wrote:
> > 
> > > Changes since v1:
> > >   * check to see if #BR occurred in userspace or kernel space.
> > >   * use generic structure and macro as much as possible when
> > >     decode mpx instructions.
> > >
> > > Qiaowei Ren (4):
> > >   x86, mpx: add documentation on Intel MPX
> > >   x86, mpx: hook #BR exception handler to allocate bound tables
> > >   x86, mpx: add prctl commands PR_MPX_INIT, PR_MPX_RELEASE
> > >   x86, mpx: extend siginfo structure to include bound violation
> > >     information
> > >
> > >  Documentation/x86/intel_mpx.txt    |   76 +++++++
> > >  arch/x86/Kconfig                   |    4 +
> > >  arch/x86/include/asm/mpx.h         |   63 ++++++
> > >  arch/x86/include/asm/processor.h   |   16 ++
> > >  arch/x86/kernel/Makefile           |    1 +
> > >  arch/x86/kernel/mpx.c              |  417
> > ++++++++++++++++++++++++++++++++++++
> > >  arch/x86/kernel/traps.c            |   61 +++++-
> > >  include/uapi/asm-generic/siginfo.h |    9 +-
> > >  include/uapi/linux/prctl.h         |    6 +
> > >  kernel/signal.c                    |    4 +
> > >  kernel/sys.c                       |   12 +
> > >  11 files changed, 667 insertions(+), 2 deletions(-)  create mode
> > > 100644 Documentation/x86/intel_mpx.txt  create mode 100644
> > > arch/x86/include/asm/mpx.h  create mode 100644 arch/x86/kernel/mpx.c
> > 
> > Such a patch submission is absolutely inadequate!
> > 
> > Please outline:
> > 
> >   - a short summary of what the feature does
> > 
> >   - a short description of what hardware supports it today or will
> >     support it in the future
> > 
> >   - a short description of whether the feature needs any
> >     configuration from the user or it's entirely auto-enabled on
> >     hardware that supports it.
> > 
> >   - a cost/benefit description to unrelated code: is this slowing down
> >     anything else?
> > 
> >   - how does user-space compiler support stand, what's the expected
> >     status there, etc.
> > 
> > Only a small fraction of that information can be found in
> > Documentation/x86/intel_mpx.txt. in
> > 
> > I'm absolutely sick of these semi-anonymous patch submissions from Intel, so
> > I'm NAK-ing it until it's communicated properly.
> > 
> Ok. I will add related content into this documentation.

More importantly, put it into the 0/X mail! That's how people can 
review such a patch set effectively.

Thanks,

	Ingo
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