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Date: Fri, 18 Jan 2008 18:27:21 +0100 (CET)
From: Andi Kleen <ak@...e.de>
To: mingo@...e.hu, hpa@...or.com, tglx@...utronix.de,
linux-kernel@...r.kernel.org
Subject: [PATCH] [5/7] Remove CONFIG_X86_TSC for 32bit
The config option protects so little code that it is fairly pointless.
Also a lot of its code was related to itself only (as in panicing without
TSC). And TSC less CPUs are completely handled at runtime anyways.
This makes 32bit behaviour match x86-64.
I also removed an #if defined(CONFIG_X86_GENERIC) in get_cycles. Not sure
what that was good for, it didn't make any sense.
Signed-off-by: Andi Kleen <ak@...e.de>
---
arch/x86/Kconfig.cpu | 4 ----
arch/x86/kernel/cpu/bugs.c | 8 --------
arch/x86/kernel/tsc_32.c | 10 ----------
drivers/acpi/processor_idle.c | 10 +++++-----
include/asm-x86/tsc.h | 6 ------
5 files changed, 5 insertions(+), 33 deletions(-)
Index: linux/arch/x86/kernel/cpu/bugs.c
===================================================================
--- linux.orig/arch/x86/kernel/cpu/bugs.c
+++ linux/arch/x86/kernel/cpu/bugs.c
@@ -151,14 +151,6 @@ static void __init check_config(void)
#endif
/*
- * If we configured ourselves for a TSC, we'd better have one!
- */
-#ifdef CONFIG_X86_TSC
- if (!cpu_has_tsc)
- panic("Kernel compiled for Pentium+, requires TSC feature!");
-#endif
-
-/*
* If we were told we had a good local APIC, check for buggy Pentia,
* i.e. all B steppings and the C2 stepping of P54C when using their
* integrated APIC (see 11AP erratum in "Pentium Processor
Index: linux/arch/x86/kernel/tsc_32.c
===================================================================
--- linux.orig/arch/x86/kernel/tsc_32.c
+++ linux/arch/x86/kernel/tsc_32.c
@@ -24,14 +24,6 @@ static int tsc_enabled;
unsigned int tsc_khz;
EXPORT_SYMBOL_GPL(tsc_khz);
-#ifdef CONFIG_X86_TSC
-static int __init tsc_setup(char *str)
-{
- printk(KERN_WARNING "notsc: Kernel compiled with CONFIG_X86_TSC, "
- "cannot disable TSC.\n");
- return 1;
-}
-#else
/*
* disable flag for tsc. Takes effect by clearing the TSC cpu flag
* in cpu/common.c
@@ -41,8 +33,6 @@ static int __init tsc_setup(char *str)
setup_clear_cpu_cap(X86_FEATURE_TSC);
return 1;
}
-#endif
-
__setup("notsc", tsc_setup);
/*
Index: linux/drivers/acpi/processor_idle.c
===================================================================
--- linux.orig/drivers/acpi/processor_idle.c
+++ linux/drivers/acpi/processor_idle.c
@@ -357,7 +357,7 @@ int acpi_processor_resume(struct acpi_de
return 0;
}
-#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86_TSC)
+#if defined (CONFIG_GENERIC_TIME)
static int tsc_halts_in_c(int state)
{
switch (boot_cpu_data.x86_vendor) {
@@ -534,7 +534,7 @@ static void acpi_processor_idle(void)
/* Get end time (ticks) */
t2 = inl(acpi_gbl_FADT.xpm_timer_block.address);
-#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86_TSC)
+#if defined (CONFIG_GENERIC_TIME)
/* TSC halts in C2, so notify users */
if (tsc_halts_in_c(ACPI_STATE_C2))
mark_tsc_unstable("possible TSC halt in C2");
@@ -599,7 +599,7 @@ static void acpi_processor_idle(void)
acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0);
}
-#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86_TSC)
+#if defined (CONFIG_GENERIC_TIME)
/* TSC halts in C3, so notify users */
if (tsc_halts_in_c(ACPI_STATE_C3))
mark_tsc_unstable("TSC halts in C3");
@@ -1465,7 +1465,7 @@ static int acpi_idle_enter_simple(struct
acpi_idle_do_entry(cx);
t2 = inl(acpi_gbl_FADT.xpm_timer_block.address);
-#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86_TSC)
+#if defined (CONFIG_GENERIC_TIME)
/* TSC could halt in idle, so notify users */
if (tsc_halts_in_c(cx->type))
mark_tsc_unstable("TSC halts in idle");;
@@ -1577,7 +1577,7 @@ static int acpi_idle_enter_bm(struct cpu
spin_unlock(&c3_lock);
}
-#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86_TSC)
+#if defined (CONFIG_GENERIC_TIME)
/* TSC could halt in idle, so notify users */
if (tsc_halts_in_c(ACPI_STATE_C3))
mark_tsc_unstable("TSC halts in idle");
Index: linux/include/asm-x86/tsc.h
===================================================================
--- linux.orig/include/asm-x86/tsc.h
+++ linux/include/asm-x86/tsc.h
@@ -23,14 +23,10 @@ static inline cycles_t get_cycles(void)
{
unsigned long long ret = 0;
-#ifndef CONFIG_X86_TSC
if (!cpu_has_tsc)
return 0;
-#endif
-#if defined(CONFIG_X86_GENERIC) || defined(CONFIG_X86_TSC)
rdtscll(ret);
-#endif
return ret;
}
@@ -40,10 +36,8 @@ static inline cycles_t vget_cycles(void)
* We only do VDSOs on TSC capable CPUs, so this shouldnt
* access boot_cpu_data (which is not VDSO-safe):
*/
-#ifndef CONFIG_X86_TSC
if (!cpu_has_tsc)
return 0;
-#endif
return (cycles_t) __native_read_tsc();
}
Index: linux/arch/x86/Kconfig.cpu
===================================================================
--- linux.orig/arch/x86/Kconfig.cpu
+++ linux/arch/x86/Kconfig.cpu
@@ -377,10 +377,6 @@ config X86_OOSTORE
def_bool y
depends on (MWINCHIP3D || MWINCHIP2 || MWINCHIPC6) && MTRR
-config X86_TSC
- def_bool y
- depends on ((MWINCHIP3D || MWINCHIP2 || MCRUSOE || MEFFICEON || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || MK8 || MVIAC3_2 || MVIAC7 || MGEODEGX1 || MGEODE_LX || MCORE2) && !X86_NUMAQ) || X86_64
-
# this should be set for all -march=.. options where the compiler
# generates cmov.
config X86_CMOV
--
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