linux-kernel - [PATCH 0/2] Use sbitmap instead of percpu

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Date:   Tue, 15 May 2018 09:00:41 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
        target-devel@...r.kernel.org,
        linux1394-devel@...ts.sourceforge.net, linux-usb@...r.kernel.org,
        kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, Juergen Gross <jgross@...e.com>,
        qla2xxx-upstream@...gic.com,
        Kent Overstreet <kent.overstreet@...il.com>,
        Jens Axboe <axboe@...nel.dk>
Cc:     Matthew Wilcox <mawilcox@...rosoft.com>
Subject: [PATCH 0/2] Use sbitmap instead of percpu_ida

From: Matthew Wilcox <mawilcox@...rosoft.com>

This is a pretty rough-and-ready conversion of the target drivers
from using percpu_ida to sbitmap.  It compiles; I don't have a target
setup, so it's completely untested.  I haven't tried to do anything
particularly clever here, so it's possible that, for example, the wait
queue in iscsi_target_util could be more clever, like the block layer
uses multiple wait queues to avoid pingpongs.  Or maybe we could figure
out a way to not store the CPU that the ID was allocated on, or perhaps
the options I specified to sbitmap_queue_init() are suboptimal.

Patch 2 isn't interesting; it just deletes the implementation.  Patch 1
will be where all the action is.

Matthew Wilcox (2):
  Convert target drivers to use sbitmap
  Remove percpu_ida

 drivers/scsi/qla2xxx/qla_target.c        |  16 +-
 drivers/target/iscsi/iscsi_target_util.c |  34 +-
 drivers/target/sbp/sbp_target.c          |   8 +-
 drivers/target/target_core_transport.c   |   5 +-
 drivers/target/tcm_fc/tfc_cmd.c          |  11 +-
 drivers/usb/gadget/function/f_tcm.c      |   8 +-
 drivers/vhost/scsi.c                     |   9 +-
 drivers/xen/xen-scsiback.c               |   8 +-
 include/linux/percpu_ida.h               |  83 -----
 include/target/iscsi/iscsi_target_core.h |   1 +
 include/target/target_core_base.h        |   5 +-
 lib/Makefile                             |   2 +-
 lib/percpu_ida.c                         | 391 -----------------------
 13 files changed, 74 insertions(+), 507 deletions(-)
 delete mode 100644 include/linux/percpu_ida.h
 delete mode 100644 lib/percpu_ida.c

-- 
2.17.0