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* [PATCH] 2.6.24: restore missing sysfs max_cstate attr
@ 2007-11-30 19:06 Mark Lord
  0 siblings, 0 replies; only message in thread
From: Mark Lord @ 2007-11-30 19:06 UTC (permalink / raw)
  To: Linux Kernel, Linux Kernel, len.brown, Andrew Morton

Len, is there any good reason why max_cstate was made invisible in 2.6.24,
breaking my userspace scripts that access it?

Here's a patch to fix the regression from 2.6.23:

Restore visibility of /sys/module/processor/parameters/max_cstate 
for compatibility with kernels prior to 2.6.24.

I have scripts here that rely upon it.

Signed-off-by: Mark Lord <>

Patch is against 2.6.24-rc3-git5.

--- linux/drivers/acpi/processor_idle.c.orig	2007-11-30 13:35:20.000000000 -0500
+++ linux/drivers/acpi/processor_idle.c	2007-11-30 13:35:31.000000000 -0500
@@ -76,7 +76,7 @@
 #define PM_TIMER_TICKS_TO_US(p)		(((p) * 1000)/(PM_TIMER_FREQUENCY/1000))
 static unsigned int max_cstate __read_mostly = ACPI_PROCESSOR_MAX_POWER;
-module_param(max_cstate, uint, 0000);
+module_param(max_cstate, uint, 0644);
 static unsigned int nocst __read_mostly;
 module_param(nocst, uint, 0000);

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