Cleanup HPET related boot options in x86-64 and deprecate 'nohpet'.
Signed-off-by: Venkatesh Pallipadi <[email protected]>
Index: linux-2.6.21-rc-mm/arch/x86_64/kernel/hpet.c
===================================================================
--- linux-2.6.21-rc-mm.orig/arch/x86_64/kernel/hpet.c
+++ linux-2.6.21-rc-mm/arch/x86_64/kernel/hpet.c
@@ -19,6 +19,7 @@
#include <asm/idle.h>
int nohpet __initdata;
+static int nohpetforce __initdata;
unsigned long hpet_address;
unsigned long hpet_period; /* fsecs / HPET clock */
@@ -217,6 +218,19 @@ static int __init nohpet_setup(char *s)
__setup("nohpet", nohpet_setup);
+static int __init hpet_setup(char *str)
+{
+ if (str) {
+ if (!strncmp("disable", str, 7))
+ nohpet = 1;
+ if (!strncmp("noforce", str, 7))
+ nohpetforce = 1;
+ }
+ return 1;
+}
+
+__setup("hpet=", hpet_setup);
+
/* Clocksource */
#define HPET_MASK 0xFFFFFFFF
#define HPET_SHIFT 22
@@ -722,7 +736,7 @@ static int __init init_hpet_generic_time
if (nohpet)
return -ENODEV;
- if (!hpet_address) {
+ if (!hpet_address && !nohpetforce) {
hpet_address = force_hpet_address;
} else {
hpet_timer_stop();
Index: linux-2.6.21-rc-mm/Documentation/kernel-parameters.txt
===================================================================
--- linux-2.6.21-rc-mm.orig/Documentation/kernel-parameters.txt
+++ linux-2.6.21-rc-mm/Documentation/kernel-parameters.txt
@@ -371,8 +371,12 @@ and is between 256 and 4096 characters.
over the 8254 in addition to over the IO-APIC. The
kernel tries to set a sensible default.
- hpet= [IA-32,HPET] option to disable HPET and use PIT.
- Format: disable
+ hpet= [IA-32/X86_64,HPET] option to disable HPET and use PIT.
+ Format: disable|noforce
+ disable - disables HPET timer detection and usage
+ noforce - disables HPET timer detection and usage when
+ it is not explicitly enabled in BIOS. i.e,
+ HPET is not enabled based on quirks.
cm206= [HW,CD]
Format: { auto | [<io>,][<irq>] }
Index: linux-2.6.21-rc-mm/Documentation/feature-removal-schedule.txt
===================================================================
--- linux-2.6.21-rc-mm.orig/Documentation/feature-removal-schedule.txt
+++ linux-2.6.21-rc-mm/Documentation/feature-removal-schedule.txt
@@ -316,3 +316,12 @@ Why: Unmaintained for years, superceded
Who: Jeff Garzik <[email protected]>
---------------------------
+
+What: X86-64 "nohpet" boot option
+When: May 2007
+Why: nohpet is not documented boot option in x86-64. There is a documented
+ boot option in i386 for similar purpose (hpet=), which is now in
+ x86-64 as well.
+Who: Venkatesh Pallipadi <[email protected]>
+
+---------------------------
-
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