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author | Tejun Heo <tj@kernel.org> | 2014-09-24 13:31:50 -0400 |
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committer | Tejun Heo <tj@kernel.org> | 2014-09-24 13:31:50 -0400 |
commit | 1cae13e75b7a7848c03138636d4eb8d8a5054dd5 (patch) | |
tree | 309eaf4b79e7a8e41e17175f3475d46bef57c2a6 /block/blk-mq-sysfs.c | |
parent | 2aad2a86f6685c10360ec8a5a55eb9ab7059cb72 (diff) | |
download | linux-1cae13e75b7a7848c03138636d4eb8d8a5054dd5.tar.bz2 |
percpu_ref: make INIT_ATOMIC and switch_to_atomic() sticky
Currently, a percpu_ref which is initialized with
PERPCU_REF_INIT_ATOMIC or switched to atomic mode via
switch_to_atomic() automatically reverts to percpu mode on the first
percpu_ref_reinit(). This makes the atomic mode difficult to use for
cases where a percpu_ref is used as a persistent on/off switch which
may be cycled multiple times.
This patch makes such atomic state sticky so that it survives through
kill/reinit cycles. After this patch, atomic state is cleared only by
an explicit percpu_ref_switch_to_percpu() call.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Kent Overstreet <kmo@daterainc.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Diffstat (limited to 'block/blk-mq-sysfs.c')
0 files changed, 0 insertions, 0 deletions