linux-kernel - Re: [PATCH v3 3/6] android: binder: Move buffer out of area shared with user space

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Date:   Wed, 30 Aug 2017 23:20:51 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Arve Hjønnevåg <arve@...roid.com>
Cc:     Sherry Yang <sherryy@...roid.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "open list:ANDROID DRIVERS" <devel@...verdev.osuosl.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Riley Andrews <riandrews@...roid.com>,
        Martijn Coenen <maco@...gle.com>, Todd Kjos <tkjos@...gle.com>
Subject: Re: [PATCH v3 3/6] android: binder: Move buffer out of area shared
 with user space

On Wed, Aug 30, 2017 at 01:04:31PM -0700, Arve Hjønnevåg wrote:
> On Wed, Aug 30, 2017 at 2:29 AM, Dan Carpenter <dan.carpenter@...cle.com> wrote:
> > On Tue, Aug 29, 2017 at 05:46:59PM -0700, Sherry Yang wrote:
> >> Binder driver allocates buffer meta data in a region that is mapped
> >> in user space. These meta data contain pointers in the kernel.
> >>
> >> This patch allocates buffer meta data on the kernel heap that is
> >> not mapped in user space, and uses a pointer to refer to the data mapped.
> >>
> >> Also move alloc->buffers initialization from mmap to init since it's
> >> now used even when mmap failed or was not called.
> >>
> >> Signed-off-by: Sherry Yang <sherryy@...roid.com>
> >> ---
> >
> > The difference between v2 and v3 is that we've shifted some
> > initialization around to fix the crashing bug that kbuild found.  You
> > should not that difference here under the --- cut off.
> >
> >>  drivers/android/binder_alloc.c          | 146 +++++++++++++++++++-------------
> >>  drivers/android/binder_alloc.h          |   2 +-
> >>  drivers/android/binder_alloc_selftest.c |  11 ++-
> >>  3 files changed, 91 insertions(+), 68 deletions(-)
> >
> > But really we still need to have some answers or discussion about the
> > questions that Greg and I raised.  Greg asked if the other Android devs
> > had Acked this.  Please ping Arve to Ack this.
> >
> tkjos@...gle.com replied and ack'ed v2. The changes have been reviewed
> on android-review.googlesource.com. Do you want and ack or review tag
> included in the patchset or do you want separate ack emails on each
> patchset (or on each patch)?

Just acking it once is fine.  I don't see that email from Todd in my
inbox and can't find it on the web archive either...  Something must
have gone wrong but I don't know what.

regards,
dan carpenter