/sys/devices/system/cpu/cpu*/smt-snooze-delay was converted into a NOP
in commit 3fa8cad82b94d0bed002571bd246f2299ffc876b, and now does
nothing. Add a pr_warn() to convince any users that they should stop
using it.
The commit message from the removing commit notes that this
functionality should move into the cpuidle driver, essentially by
adjusting target_residency to the specified value. At the moment,
target_residency is not exposed by cpuidle's sysfs, so there isn't a
drop in replacement for this.
Signed-off-by: Cody P Schafer <c...@linux.vnet.ibm.com>
---
arch/powerpc/kernel/sysfs.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/arch/powerpc/kernel/sysfs.c b/arch/powerpc/kernel/sysfs.c
index 97e1dc9..84097b4 100644
--- a/arch/powerpc/kernel/sysfs.c
+++ b/arch/powerpc/kernel/sysfs.c
@@ -50,6 +50,9 @@ static ssize_t store_smt_snooze_delay(struct device *dev,
if (ret != 1)
return -EINVAL;
+ pr_warn_ratelimited("%s (%d):
/sys/devices/system/cpu/cpu%d/smt-snooze-delay is deprecated and is a NOP\n",
+ current->comm, task_pid_nr(current), cpu->dev.id);
+
per_cpu(smt_snooze_delay, cpu->dev.id) = snooze;
return count;
}
@@ -60,6 +63,9 @@ static ssize_t show_smt_snooze_delay(struct device *dev,
{
struct cpu *cpu = container_of(dev, struct cpu, dev);
+ pr_warn_ratelimited("%s (%d):
/sys/devices/system/cpu/cpu%d/smt-snooze-delay is deprecated and is a NOP\n",
+ current->comm, task_pid_nr(current), cpu->dev.id);
+
return sprintf(buf, "%ld\n", per_cpu(smt_snooze_delay, cpu->dev.id));
}
--
1.9.0
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