[PATCH tip v5 0/5] Simple wait queue support

[Daniel Wagner]

Hi,

New week, new version!

v5 fixes the wrong API usage in ("rcu: Do not call
rcu_nocb_gp_cleanup() while holding rnp->lock") as reported by Boqun.

The compile time assertion in previous version (patch #2) didn't hold
at all. So I tried to macrofying most of the swait/wait API which
looks really ugly and therefore isn't really an option[1]. Instead
'-Werror=incompatible-pointer-types' is introduced in patch 2. I
compiled s390, arm, powerpc, mips and alpha with allyesconfig, and all
is fine. It doesn't look like that this will trigger a lot of new
errors.

The rest has not changed. Happy reviewing. I wouldn't mind acks,
reviewed or even sobs :)

These patches are against

  tip/sched/core e73e85f0593832aa583b252f9a16cf90ed6d30fa

also available as git tree:

  git://git.kernel.org/pub/scm/linux/kernel/git/wagi/linux.git tip-swait

cheers,
daniel

[1] https://www.mail-archive.com/linux-kernel@xxxxxxxxxxxxxxx/msg1029072.html

changes since v4:
 - replaced patch #2 which tried to force to compiler to
   exit with an error by using compile time assertion type
   check macros. Instead use -Werror=incompatible-pointer-types
   to tell the compiler to barf loudly.
 - fixed wrong API usage in patch 4 as reported by Boqun.

changes since v3
 - rebased it on tip/sched/core (KVM bits have changed slightly)
 - added compile time type check assertion
 - added non lazy version of swake_up_locked()

changes since v2
 - rebased again on tip/master. The patches apply
   cleanly on v4.3-rc6 too.
 - fixed up mips
 - reordered patches to avoid lockdep warning when doing bissect.
 - remove unnecessary initialization of rsp->rda in rcu_init_one().

changes since v1 (PATCH v0)
 - rebased and fixed some typos found by cross building
   for S390, ARM and powerpc. For some unknown reason didn't catch
   them last time.
 - dropped completion patches because it is not clear yet
   how to handle complete_all() calls hard-irq/atomic contexts
   and swake_up_all.

changes since v0 (RFC v0)
 - promoted the series to PATCH state instead of RFC
 - fixed a few fallouts with build all and some cross compilers
   such ARM, PowerPC, S390.
 - Added the simple waitqueue transformation for KVM from -rt
   including some numbers requested by Paolo.
 - Added a commit message to PeterZ's patch. Hope he likes it.

[I got the numbering wrong in v1, so instead 'PATCH v1' you find it
 as 'PATCH v0' series]

v4: https://lwn.net/Articles/665655/
v3: https://lwn.net/Articles/661415/
v2: https://lwn.net/Articles/660628/
v1: https://lwn.net/Articles/656942/
v0: https://lwn.net/Articles/653586/

Daniel Wagner (2):
  kbuild: Add option to turn incompatible pointer check into error
  rcu: Do not call rcu_nocb_gp_cleanup() while holding rnp->lock

Marcelo Tosatti (1):
  KVM: use simple waitqueue for vcpu->wq

Paul Gortmaker (1):
  rcu: use simple wait queues where possible in rcutree

Peter Zijlstra (Intel) (1):
  wait.[ch]: Introduce the simple waitqueue (swait) implementation

 Makefile                            |   4 +
 arch/arm/kvm/arm.c                  |   4 +-
 arch/arm/kvm/psci.c                 |   4 +-
 arch/mips/kvm/mips.c                |   8 +-
 arch/powerpc/include/asm/kvm_host.h |   4 +-
 arch/powerpc/kvm/book3s_hv.c        |  23 +++--
 arch/s390/include/asm/kvm_host.h    |   2 +-
 arch/s390/kvm/interrupt.c           |   8 +-
 arch/x86/kvm/lapic.c                |   6 +-
 include/linux/kvm_host.h            |   5 +-
 include/linux/swait.h               | 172 ++++++++++++++++++++++++++++++++++++
 kernel/rcu/tree.c                   |  24 ++---
 kernel/rcu/tree.h                   |  12 +--
 kernel/rcu/tree_plugin.h            |  32 ++++---
 kernel/sched/Makefile               |   2 +-
 kernel/sched/swait.c                | 123 ++++++++++++++++++++++++++
 lib/Kconfig.debug                   |   7 ++
 virt/kvm/async_pf.c                 |   4 +-
 virt/kvm/kvm_main.c                 |  17 ++--
 19 files changed, 390 insertions(+), 71 deletions(-)
 create mode 100644 include/linux/swait.h
 create mode 100644 kernel/sched/swait.c

-- 
2.4.3

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