Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Pull arm64 fix from Will Deacon:
- Fix event counting regression in Arm CMN PMU driver due to broken
optimisation
* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
Partially revert "perf/arm-cmn: Optimise DTC counter accesses"
+6
-1
+6
-1
drivers/perf/arm-cmn.c
+6
-1
drivers/perf/arm-cmn.c
···
1576
1576
hw->dn++;
1577
1577
continue;
1578
1578
}
1579
-
hw->dtcs_used |= arm_cmn_node_to_xp(cmn, dn)->dtc;
1580
1579
hw->num_dns++;
1581
1580
if (bynodeid)
1582
1581
break;
···
1588
1589
nodeid, nid.x, nid.y, nid.port, nid.dev, type);
1589
1590
return -EINVAL;
1590
1591
}
1592
+
/*
1593
+
* Keep assuming non-cycles events count in all DTC domains; turns out
1594
+
* it's hard to make a worthwhile optimisation around this, short of
1595
+
* going all-in with domain-local counter allocation as well.
1596
+
*/
1597
+
hw->dtcs_used = (1U << cmn->num_dtcs) - 1;
1591
1598
1592
1599
return arm_cmn_validate_group(cmn, event);
1593
1600
}