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[00/14] cpumask: cleanup cpumask_next_wrap() implementation and usage

Message ID 20241228184949.31582-1-yury.norov@gmail.com (mailing list archive)
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Series cpumask: cleanup cpumask_next_wrap() implementation and usage | expand

Message

Yury Norov (NVIDIA) Dec. 28, 2024, 6:49 p.m. UTC 
cpumask_next_wrap() is overly complicated, comparing to it's generic
version find_next_bit_wrap(), not mentioning it duplicates the above.
It roots to the times when the function was used in the implementation
of for_each_cpu_wrap() iterator. The function has 2 additional parameters
that were used to catch loop termination condition for the iterator.
(Although, only one is needed.)

Since 4fe49b3b97c262 ("lib/bitmap: introduce for_each_set_bit_wrap()
macro"), for_each_cpu_wrap() is wired to corresponding generic
wrapping bitmap iterator, and additional complexity of
cpumask_next_wrap() is not needed anymore.

All existing users call cpumask_next_wrap() in a manner that makes
it possible to turn it to a straight and simple alias to
find_next_bit_wrap().

This series replaces historical 4-parameter cpumask_next_wrap() with a
thin 2-parameter wrapper around find_next_bit_wrap().

Where it's possible to use for_each_cpu_wrap() iterator, the code is
switched to use it because it's always preferable to use iterators over
open loops.

This series touches various scattered subsystems and To-list for the
whole series is quite a long. To minimize noise, I send cover-letter and
key patches #5 and 6 to every person involved. All other patches are sent
individually to those pointed by scripts/get_maintainers.pl.

I'd like to move the series with my bitmap-for-next branch as a whole.

Yury Norov (14):
  objpool: rework objpool_pop()
  virtio_net: simplify virtnet_set_affinity()
  ibmvnic: simplify ibmvnic_set_queue_affinity()
  powerpc/xmon: simplify xmon_batch_next_cpu()
  cpumask: deprecate cpumask_next_wrap()
  cpumask: re-introduce cpumask_next_wrap()
  cpumask: use cpumask_next_wrap() where appropriate
  padata: switch padata_find_next() to using cpumask_next_wrap()
  s390: switch stop_machine_yield() to using cpumask_next_wrap()
  nvme-tcp: switch nvme_tcp_set_queue_io_cpu() to using
    cpumask_next_wrap()
  scsi: lpfc: switch lpfc_irq_rebalance() to using cpumask_next_wrap()
  scsi: lpfc: rework lpfc_next_{online,present}_cpu()
  PCI: hv: switch hv_compose_multi_msi_req_get_cpu() to using
    cpumask_next_wrap()
  cpumask: drop cpumask_next_wrap_old()

 arch/powerpc/xmon/xmon.c            |  6 +---
 arch/s390/kernel/processor.c        |  2 +-
 drivers/net/ethernet/ibm/ibmvnic.c  | 17 +++++-----
 drivers/net/virtio_net.c            | 12 +++++---
 drivers/nvme/host/tcp.c             |  2 +-
 drivers/pci/controller/pci-hyperv.c |  3 +-
 drivers/scsi/lpfc/lpfc.h            | 23 +++-----------
 drivers/scsi/lpfc/lpfc_init.c       |  2 +-
 include/linux/cpumask.h             | 48 ++++++++++++++++-------------
 include/linux/objpool.h             |  7 ++---
 kernel/padata.c                     |  2 +-
 lib/cpumask.c                       | 37 ++--------------------
 12 files changed, 60 insertions(+), 101 deletions(-)

Comments

Christoph Hellwig Jan. 3, 2025, 7:02 a.m. UTC | #1 
You've sent me less than a handfull of 14 patches, there's no way
to properly review this.
Yury Norov (NVIDIA) Jan. 3, 2025, 3:21 p.m. UTC | #2 
On Fri, Jan 03, 2025 at 08:02:29AM +0100, Christoph Hellwig wrote:
> You've sent me less than a handfull of 14 patches, there's no way
> to properly review this.

Hi Christoph,

You can find the whole series here:

https://lore.kernel.org/linux-scsi/CABPRKS-uqfJmDp5pS+hSnvzggdMv0bNawpsVNpY4aU4V+UdR7Q@mail.gmail.com/T/

Or you can download it by message ID like this:

b4 mbox 20241228184949.31582-1-yury.norov@gmail.com

Sorry for not CC-ing you to the whole series. Some people prefer to
receive minimal noise, and you never know who is who. If it comes to
v2, you'll be in CC for every patch.

Thanks,
Yury