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pmc: don't add pmc owner to list until setup is complete

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Once a pmc owner is added to the pmc_ss_owners list it is
visible for all to see. We don't want this to happen until
setup is complete.

Reported by:	mjg
Approved by:	sbruno
This commit is contained in:
Matt Macy 2018-05-14 01:08:47 +00:00
parent eae1b7dfa1
commit 8fa7df3668
1 changed files with 6 additions and 7 deletions
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13
sys/dev/hwpmc/hwpmc_mod.c
View file

@ -2733,13 +2733,6 @@ pmc_start(struct pmc *pm)
*/
if (mode == PMC_MODE_SS) {
if (po->po_sscount == 0) {
CK_LIST_INSERT_HEAD(&pmc_ss_owners, po, po_ssnext);
atomic_add_rel_int(&pmc_ss_count, 1);
PMCDBG1(PMC,OPS,1, "po=%p in global list", po);
}
po->po_sscount++;
/*
* Log mapping information for all existing processes in the
* system. Subsequent mappings are logged as they happen;
@ -2749,6 +2742,12 @@ pmc_start(struct pmc *pm)
pmc_log_all_process_mappings(po);
po->po_logprocmaps = 1;
}
po->po_sscount++;
if (po->po_sscount == 1) {
atomic_add_rel_int(&pmc_ss_count, 1);
CK_LIST_INSERT_HEAD(&pmc_ss_owners, po, po_ssnext);
PMCDBG1(PMC,OPS,1, "po=%p in global list", po);
}
}
/*