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authorTobias Klauser <tklauser@distanz.ch>2017-01-17 14:11:31 +0100
committerTobias Klauser <tklauser@distanz.ch>2017-01-17 14:27:06 +0100
commita1351738ba11c8e2d38f6df5276cc59f7acb2d2f (patch)
treefdcc605e39a4ddec3d42921241f6d03ec461cf59 /netsniff-ng/Makefile
parent80e70fdcf8861ab757b6bfc8f0fbaec31cde57bf (diff)
list: Remove cds_list_* wrappers
Use the cds_list_* types and macros directly instead of redefining them. This makes it clear that we're not using the Linux kernel implementation of list_head but the one from urcu. Also make sure _LGPL_SOURCE is defined everywhere the urcu functionality is used, such that we get the statically linkable version with reduced overhead. Reference: https://lwn.net/Articles/573424/#qq2answer Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Diffstat (limited to 'netsniff-ng/Makefile')
0 files changed, 0 insertions, 0 deletions
er assumes it does not need to do a corresponding percpu_ref_put(). This was seen when performing CPU hotplug during I/O, as hangs in blk_mq_freeze_queue_wait where percpu_ref_kill (blk_mq_freeze_queue_start) raced with percpu_ref_tryget (blk_mq_timeout_work). Sample stack trace: __switch_to+0x2c0/0x450 __schedule+0x2f8/0x970 schedule+0x48/0xc0 blk_mq_freeze_queue_wait+0x94/0x120 blk_mq_queue_reinit_work+0xb8/0x180 blk_mq_queue_reinit_prepare+0x84/0xa0 cpuhp_invoke_callback+0x17c/0x600 cpuhp_up_callbacks+0x58/0x150 _cpu_up+0xf0/0x1c0 do_cpu_up+0x120/0x150 cpu_subsys_online+0x64/0xe0 device_online+0xb4/0x120 online_store+0xb4/0xc0 dev_attr_store+0x68/0xa0 sysfs_kf_write+0x80/0xb0 kernfs_fop_write+0x17c/0x250 __vfs_write+0x6c/0x1e0 vfs_write+0xd0/0x270 SyS_write+0x6c/0x110 system_call+0x38/0xe0 Examination of the queue showed a single reference (no PERCPU_COUNT_BIAS, and __PERCPU_REF_DEAD, __PERCPU_REF_ATOMIC set) and no requests. However, conditions at the time of the race are count of PERCPU_COUNT_BIAS + 0 and __PERCPU_REF_DEAD and __PERCPU_REF_ATOMIC set. The fix is to make the tryget routines use an actual boolean internally instead of the atomic long result truncated to a int. Fixes: e625305b3907 percpu-refcount: make percpu_ref based on longs instead of ints Link: https://bugzilla.kernel.org/show_bug.cgi?id=190751 Signed-off-by: Douglas Miller <dougmill@linux.vnet.ibm.com> Reviewed-by: Jens Axboe <axboe@fb.com> Signed-off-by: Tejun Heo <tj@kernel.org> Fixes: e625305b3907 ("percpu-refcount: make percpu_ref based on longs instead of ints") Cc: stable@vger.kernel.org # v3.18+
Diffstat (limited to 'include/net/sctp/tsnmap.h')