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path: root/tools/perf/arch/sparc/include/dwarf-regs-table.h
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#ifdef DEFINE_DWARF_REGSTR_TABLE
/* This is included in perf/util/dwarf-regs.c */

static const char * const sparc_regstr_tbl[] = {
	"%g0", "%g1", "%g2", "%g3", "%g4", "%g5", "%g6", "%g7",
	"%o0", "%o1", "%o2", "%o3", "%o4", "%o5", "%sp", "%o7",
	"%l0", "%l1", "%l2", "%l3", "%l4", "%l5", "%l6", "%l7",
	"%i0", "%i1", "%i2", "%i3", "%i4", "%i5", "%fp", "%i7",
	"%f0", "%f1", "%f2", "%f3", "%f4", "%f5", "%f6", "%f7",
	"%f8", "%f9", "%f10", "%f11", "%f12", "%f13", "%f14", "%f15",
	"%f16", "%f17", "%f18", "%f19", "%f20", "%f21", "%f22", "%f23",
	"%f24", "%f25", "%f26", "%f27", "%f28", "%f29", "%f30", "%f31",
	"%f32", "%f33", "%f34", "%f35", "%f36", "%f37", "%f38", "%f39",
	"%f40", "%f41", "%f42", "%f43", "%f44", "%f45", "%f46", "%f47",
	"%f48", "%f49", "%f50", "%f51", "%f52", "%f53", "%f54", "%f55",
	"%f56", "%f57", "%f58", "%f59", "%f60", "%f61", "%f62", "%f63",
};
#endif
fs_trans_bmap.c?id=966d2b04e070bc040319aaebfec09e0144dc3341&id2=1b1bc42c1692e9b62756323c675a44cb1a1f9dbd'>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 'fs/xfs/xfs_trans_bmap.c')