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Add kpreempt_disable/enable around CPU_SEQID uses

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In zfs/dmu_object and icp/core/kcf_sched, the CPU_SEQID macro
should be surrounded by `kpreempt_disable` and `kpreempt_enable`
calls to avoid a Linux kernel BUG warning.  These code paths use
the cpuid to minimize lock contention and is is safe to reschedule
the process to a different processor at any time.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Morgan Jones <me@numin.it>
Closes #6239
This commit is contained in:
Morgan Jones
2017-06-19 16:43:16 +00:00
committed by Brian Behlendorf
parent 0241e491a0
commit d9ad3fea3b
2 changed files with 11 additions and 4 deletions
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module/zfs/dmu_object.c
+6 -2
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@@ -59,10 +59,14 @@ dmu_object_alloc_dnsize(objset_t *os, dmu_object_type_t ot, int blocksize,
dnode_t *dn = NULL;
int dn_slots = dnodesize >> DNODE_SHIFT;
boolean_t restarted = B_FALSE;
uint64_t *cpuobj = &os->os_obj_next_percpu[CPU_SEQID %
os->os_obj_next_percpu_len];
uint64_t *cpuobj = NULL;
int dnodes_per_chunk = 1 << dmu_object_alloc_chunk_shift;
kpreempt_disable();
cpuobj = &os->os_obj_next_percpu[CPU_SEQID %
os->os_obj_next_percpu_len];
kpreempt_enable();
if (dn_slots == 0) {
dn_slots = DNODE_MIN_SLOTS;
} else {