#ifndef __PERF_SVGHELPER_H #define __PERF_SVGHELPER_H #include void open_svg(const char *filename, int cpus, int rows, u64 start, u64 end); void svg_ubox(int Yslot, u64 start, u64 end, double height, const char *type, int fd, int err, int merges); void svg_lbox(int Yslot, u64 start, u64 end, double height, const char *type, int fd, int err, int merges); void svg_fbox(int Yslot, u64 start, u64 end, double height, const char *type, int fd, int err, int merges); void svg_box(int Yslot, u64 start, u64 end, const char *type); void svg_blocked(int Yslot, int cpu, u64 start, u64 end, const char *backtrace); void svg_running(int Yslot, int cpu, u64 start, u64 end, const char *backtrace); void svg_waiting(int Yslot, int cpu, u64 start, u64 end, const char *backtrace); void svg_cpu_box(int cpu, u64 max_frequency, u64 turbo_frequency); void svg_process(int cpu, u64 start, u64 end, int pid, const char *name, const char *backtrace); void svg_cstate(int cpu, u64 start, u64 end, int type); void svg_pstate(int cpu, u64 start, u64 end, u64 freq); void svg_time_grid(double min_thickness); void svg_io_legenda(void); void svg_legenda(void); void svg_wakeline(u64 start, int row1, int row2, const char *backtrace); void svg_partial_wakeline(u64 start, int row1, char *desc1, int row2, char *desc2, const char *backtrace); void svg_interrupt(u64 start, int row, const char *backtrace); void svg_text(int Yslot, u64 start, const char *text); void svg_close(void); int svg_build_topology_map(char *sib_core, int sib_core_nr, char *sib_thr, int sib_thr_nr); extern int svg_page_width; extern u64 svg_highlight; extern const char *svg_highlight_name; #endif /* __PERF_SVGHELPER_H */ 66d2b04e070bc040319aaebfec09e0144dc3341'>refslogtreecommitdiff
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authorDouglas Miller <dougmill@linux.vnet.ibm.com>2017-01-28 06:42:20 -0600
committerTejun Heo <tj@kernel.org>2017-01-28 07:49:42 -0500
commit966d2b04e070bc040319aaebfec09e0144dc3341 (patch)
tree4b96156e3d1dd4dfd6039b7c219c9dc4616da52d /net/irda/ircomm
parent1b1bc42c1692e9b62756323c675a44cb1a1f9dbd (diff)
percpu-refcount: fix reference leak during percpu-atomic transition
percpu_ref_tryget() and percpu_ref_tryget_live() should return "true" IFF they acquire a reference. But the return value from atomic_long_inc_not_zero() is a long and may have high bits set, e.g. PERCPU_COUNT_BIAS, and the return value of the tryget routines is bool so the reference may actually be acquired but the routines return "false" which results in a reference leak since the caller 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 'net/irda/ircomm')