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[S390] s390: enforce HW limits for the initial sampling rate

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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: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Christian Borntraeger 2011-06-22 16:24:08 +02:00 committed by Martin Schwidefsky
parent 80629b0b0f
commit b530ce7a1a
1 changed files with 6 additions and 0 deletions
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6
arch/s390/oprofile/init.c
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@ -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;