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Commit b530ce7a authored by Christian Borntraeger's avatar Christian Borntraeger Committed by Martin Schwidefsky
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[S390] s390: enforce HW limits for the initial sampling rate 



On specific configurations with hwsampler opcontrol --start returns an
error on "echo 1 >/dev/oprofile/enable". Turns out that the hw sampling
interval is not checked against the hardware limits.

Signed-off-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 80629b0b

arch/s390/oprofile/init.c

+6 −0
Original line number Diff line number Diff line
@@ -151,6 +151,12 @@ static int oprofile_hwsampler_init(struct oprofile_operations *ops) 
	if (oprofile_max_interval == 0)

		return -ENODEV;



	/* The initial value should be sane */

	if (oprofile_hw_interval < oprofile_min_interval)

		oprofile_hw_interval = oprofile_min_interval;

	if (oprofile_hw_interval > oprofile_max_interval)

		oprofile_hw_interval = oprofile_max_interval;



	if (oprofile_timer_init(ops))

		return -ENODEV;