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  1. 21 2月, 2018 1 次提交
  3. 07 2月, 2018 8 次提交
  5. 06 2月, 2018 1 次提交
    • M
      powerpc, membarrier: Skip memory barrier in switch_mm() · 3ccfebed
      由 Mathieu Desnoyers 提交于 
      Allow PowerPC to skip the full memory barrier in switch_mm(), and
only issue the barrier when scheduling into a task belonging to a
process that has registered to use expedited private.

Threads targeting the same VM but which belong to different thread
groups is a tricky case. It has a few consequences:

It turns out that we cannot rely on get_nr_threads(p) to count the
number of threads using a VM. We can use
(atomic_read(&mm->mm_users) == 1 && get_nr_threads(p) == 1)
instead to skip the synchronize_sched() for cases where the VM only has
a single user, and that user only has a single thread.

It also turns out that we cannot use for_each_thread() to set
thread flags in all threads using a VM, as it only iterates on the
thread group.

Therefore, test the membarrier state variable directly rather than
relying on thread flags. This means
membarrier_register_private_expedited() needs to set the
MEMBARRIER_STATE_PRIVATE_EXPEDITED flag, issue synchronize_sched(), and
only then set MEMBARRIER_STATE_PRIVATE_EXPEDITED_READY which allows
private expedited membarrier commands to succeed.
membarrier_arch_switch_mm() now tests for the
MEMBARRIER_STATE_PRIVATE_EXPEDITED flag.
Signed-off-by: NMathieu Desnoyers <mathieu.desnoyers@efficios.com>
Acked-by: NThomas Gleixner <tglx@linutronix.de>
Acked-by: NPeter Zijlstra (Intel) <peterz@infradead.org>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Andrea Parri <parri.andrea@gmail.com>
Cc: Andrew Hunter <ahh@google.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Avi Kivity <avi@scylladb.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Dave Watson <davejwatson@fb.com>
Cc: David Sehr <sehr@google.com>
Cc: Greg Hackmann <ghackmann@google.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Maged Michael <maged.michael@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Will Deacon <will.deacon@arm.com>
Cc: linux-api@vger.kernel.org
Cc: linux-arch@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Link: http://lkml.kernel.org/r/20180129202020.8515-3-mathieu.desnoyers@efficios.comSigned-off-by: NIngo Molnar <mingo@kernel.org>
      3ccfebed
  7. 05 2月, 2018 2 次提交
  9. 02 2月, 2018 1 次提交
  11. 01 2月, 2018 1 次提交
  13. 31 1月, 2018 5 次提交
  15. 29 1月, 2018 1 次提交
  17. 27 1月, 2018 4 次提交
  19. 26 1月, 2018 1 次提交
  21. 25 1月, 2018 7 次提交
  23. 23 1月, 2018 1 次提交
    • M
      MIPS: ranchu: Add Ranchu as a new generic-based board · f2d0b0d5
      由 Miodrag Dinic 提交于 
      Provide amendments to the MIPS generic platform framework so that
the new generic-based board Ranchu can be chosen to be built.

The Ranchu board is intended to be used by Android emulator. The name
"Ranchu" originates from Android development community. "Goldfish" and
"Ranchu" are terms used for two generations of virtual boards used by
Android emulator. The name "Ranchu" is a newer one among the two, and
this patch deals with Ranchu. However, for historical reasons, some
devices/drivers still contain the name "Goldfish".

MIPS Ranchu machine includes a number of Goldfish devices. The support
for Virtio devices is also included. Ranchu board supports up to 16
Virtio devices which can be attached using Virtio MMIO Bus. This is
summarized in the following picture:

       ABUS
        ||----MIPS CPU
        ||       |                    IRQs
        ||----Goldfish PIC------------(32)--------
        ||                     | | | | | | | | |
        ||----Goldfish TTY------ | | | | | | | |
        ||                       | | | | | | | |
        ||----Goldfish RTC-------- | | | | | | |
        ||                         | | | | | | |
        ||----Goldfish FB----------- | | | | | |
        ||                           | | | | | |
        ||----Goldfish Events--------- | | | | |
        ||                             | | | | |
        ||----Goldfish Audio------------ | | | |
        ||                               | | | |
        ||----Goldfish Battery------------ | | |
        ||                                 | | |
        ||----Android PIPE------------------ | |
        ||                                   | |
        ||----Virtio MMIO Bus                | |
        ||    |    |    |                    | |
        ||    |    |   (virtio-block)--------- |
        ||   (16)  |                           |
        ||    |   (virtio-net)------------------

Device Tree is created on the QEMU side based on the information about
devices IO map and IRQ numbers. Kernel will load this DTB using UHI
boot protocol DTB handover mode.
Signed-off-by: NMiodrag Dinic <miodrag.dinic@mips.com>
Signed-off-by: NGoran Ferenc <goran.ferenc@mips.com>
Signed-off-by: NAleksandar Markovic <aleksandar.markovic@mips.com>
Reviewed-by: NJames Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paul Burton <paul.burton@mips.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/18138/Signed-off-by: NJames Hogan <jhogan@kernel.org>
      f2d0b0d5
  25. 22 1月, 2018 1 次提交
  27. 19 1月, 2018 1 次提交
  29. 18 1月, 2018 1 次提交
  31. 16 1月, 2018 3 次提交
    • F
      MAINTAINERS: Add NuBus subsystem entry · 2334b1ac
      由 Finn Thain 提交于 
      This is legacy code but it might as well have an official maintainer.

Cc: linux-m68k@lists.linux-m68k.org
Signed-off-by: NFinn Thain <fthain@telegraphics.com.au>
Signed-off-by: NGeert Uytterhoeven <geert@linux-m68k.org>
      2334b1ac
    • R
      MAINTAINERS: Remove from module & paravirt maintenance · ed875ea1
      由 Rusty Russell 提交于 
      It's been 20 years since I became a kernel maintainer, so despite how
much I'm loving my new career, this patch elicits deep feelings[0].

I went to 1997 USENIX, my first conference.  I remember[1] standing
around with Alan Cox, Linus, Ted Ts'o and David Miller as they wrote
the code for the BKL on a napkin.  I listened in awe as this
homeless-looking guy described porting Linux to the Ultrasparc, and
then described how he then proceeded to beat Solaris on *every single*
lmbench microbenchmark.[2]

A lot of it I didn't understand, but I got home knowing that I had to
work with this random bunch of hackers.  I had some firewalling hacks
which I turned into ipchains, and sent it to DaveM with a config
option to switch between the old ipfwadm code and my new code.  He
liked it so much he replaced ipfwadm entirely, and I woke up one day
as kernel firewall maintainer[3].

I found someone to fund my work the next year, and suddenly I was
doing my dream job full time.  I flew myself around Australia visiting
every LUG to convince them to come to the first Australian Linux
conference.  And of course, DaveM was top of my list for speakers.

There was so much work to do on the kernel; everywhere you'd look
there was code which could be simplified, improved.  I read the module
code and was so horrified at its complexity that I rewrote it, not
realizing how epic that would be.  Of course I broke lots of things;
halfway through the patch series I broke SCSI, so Linus applied up to
that point and we had half a module subsystem for a while; I was
literally in the airport in Tokyo on my way to Spain when he applied
it, too.  Every arch maintainer woke up to find they had to implement
a whack of complex relocation code, and I got a lot of grumbling.[5]

But one person disagreed with my approach so much and so continuously
that I developed a dread of reading my mail every morning: eventually
I wrote a filter to send their mail to a separate mbox, which I've
still never read and don't intend to.

But mainly, it was a huge amount of fun.  I got to hack, and geek out
with hackers all around the world.  When I flew into San Jose for the
first time, DaveM offered to pick me up: turns out he had a two seater
so I rode squashed under the rear glass on the overside parcel shelf
to see the sights (Sun campus, Berkeley).  Back home, I moved to
Canberra to join the legendary group of hackers at OzLabs.

The mailing list changed: I gradually learned not to be an asshole
(unless, y'know, it was *really* funny, and eventually not even then).
Most of my peers trended the same way.  The kernel itself became more
formal, more complex, and giant overarching changes became far, far
fewer.  There are still horrible APIs (the return value of
copy_to/from_user, using the same type for list heads and elements, to
name two[7]), but the modern calculus of disruptive changes means
sometimes we simply step over the broken paving stones instead of
repairing them.

I built a team around netfilter, then handed maintenence off to Harald
Welte and ceased contributing: I wanted him to own it entirely.  I was
more nervous handing module maintenance over to someone I've never
even met or spoken to, but it's clear now that with Jessica Yu I have
scored 2 for 2.  I'm as proud of choosing them as of any individual
piece of kernel code[8].

To my fellow maintainers: stay harsh on code and don't be afraid to
say "No" or "Why?"; there really are more bad ideas than good ones,
and complexity is such a bright candle for us hacker-moths.  But be
gentle, kind and forgiving of your peers: respect from people you
respect is really the only reward that sticks[9].

Farewell all, and I look forward to crossing your paths again!
Rusty.

[0] Which means I'm now going maudle for NINE paragraphs! And no TLDR, bwahaha!
[1] OK, I remember this.  Reality may differ.
[2] There's no recording of this talk, but it was the best technical
    talk anyone has ever given on anything[1].
[3] On the internet, nobody knows you barely passed Computer Networking![4]
[4] OTOH I topped COBOL/Database programming, so I have no idea what happened.
[5] Except DaveM.  I'd written test reloc code for sparc/spac64, but
    he didn't know that so he just cheerfully reimplemented it.[6]
[6] Those reading this post closely may suspect that I have a massive
    hackercrush on David S. Miller.  Those reading the code closely, of course,
    already feel that way themselves.
[7] But set_bit finally takes a long!  Seriously...
[8] Though the ARRAY_SIZE macro and the poetry in lguest are a close second.
[9] Actually, bitcoin is a nice reward too; it's like crystalized machine
    sweat!
Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
Signed-off-by: NJessica Yu <jeyu@kernel.org>
      ed875ea1
    • L
      net: ethernet: Add a driver for Gemini gigabit ethernet · 4d5ae32f
      由 Linus Walleij 提交于 
      The Gemini ethernet has been around for years as an out-of-tree
patch used with the NAS boxen and routers built on StorLink
SL3512 and SL3516, later Storm Semiconductor, later Cortina
Systems. These ASICs are still being deployed and brand new
off-the-shelf systems using it can easily be acquired.

The full name of the IP block is "Net Engine and Gigabit
Ethernet MAC" commonly just called "GMAC".

The hardware block contains a common TCP Offload Enginer (TOE)
that can be used by both MACs. The current driver does not use
it.

Cc: Tobias Waldvogel <tobias.waldvogel@gmail.com>
Signed-off-by: NMichał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      4d5ae32f
  33. 15 1月, 2018 1 次提交