[GIT pull] timers/cleanups for v7.3-rc1
From: Thomas Gleixner
Date: Mon Aug 17 2026 - 07:25:58 EST
Linus,
please pull the latest timers/cleanups branch from:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git timers-cleanups-2026-08-17
up to: dfc256dac54c: calibrate: Rework delay timer calibration
Treewide timer related cleanups:
- Remove the leftover CLOCK_TICK_RATE which has been scheduled for
removal more than a decade ago along with some now empty asm/timex.h
files.
- Consolidate delay timer calibration
The construct of having a define in a header requires that
architectures provided asm/timex.h for no reason. Also the function
name for reading the delay timer is confusing at best.
Use a config switch to enable that functionality and rename the
function to delay_read_timer() to make the purpose clear.
This removes some more now empty asm/timex.h files as well.
Thanks,
tglx
------------------>
Thomas Gleixner (3):
x86: Use PIT_TICK_RATE instead of CLOCK_TICK_RATE
treewide: Remove CLOCK_TICK_RATE
calibrate: Rework delay timer calibration
arch/Kconfig | 3 +++
arch/alpha/include/asm/timex.h | 4 ----
arch/arc/include/asm/timex.h | 15 ---------------
arch/arm/Kconfig | 1 +
arch/arm/include/asm/delay.h | 1 -
arch/arm/include/asm/timex.h | 5 ++++-
arch/arm/lib/delay.c | 10 ++++------
arch/arm/mach-omap1/Kconfig | 2 +-
arch/hexagon/Kconfig | 1 +
arch/hexagon/include/asm/timex.h | 23 -----------------------
arch/hexagon/kernel/time.c | 8 +++++++-
arch/m68k/include/asm/timex.h | 15 ---------------
arch/microblaze/include/asm/timex.h | 13 -------------
arch/mips/include/asm/timex.h | 8 --------
arch/openrisc/Kconfig | 1 +
arch/openrisc/include/asm/timex.h | 5 -----
arch/openrisc/lib/delay.c | 9 ++++-----
arch/parisc/include/asm/timex.h | 2 --
arch/powerpc/include/asm/timex.h | 2 --
arch/riscv/Kconfig | 1 +
arch/riscv/include/asm/timex.h | 8 --------
arch/riscv/lib/delay.c | 7 ++++++-
arch/s390/include/asm/timex.h | 2 --
arch/sh/include/asm/timex.h | 24 ------------------------
arch/sparc/Kconfig | 1 +
arch/sparc/include/asm/timex.h | 2 +-
arch/sparc/include/asm/timex_32.h | 14 --------------
arch/sparc/include/asm/timex_64.h | 4 ----
arch/sparc/kernel/time_64.c | 4 ++--
arch/um/include/asm/timex.h | 9 ---------
arch/x86/Kconfig | 1 +
arch/x86/include/asm/timex.h | 5 -----
arch/x86/kernel/setup.c | 2 +-
arch/x86/lib/delay.c | 8 +++-----
include/asm-generic/timex.h | 7 -------
include/linux/delay.h | 2 ++
include/linux/timex.h | 2 --
init/calibrate.c | 19 +++++++++----------
38 files changed, 53 insertions(+), 197 deletions(-)
delete mode 100644 arch/arc/include/asm/timex.h
delete mode 100644 arch/hexagon/include/asm/timex.h
delete mode 100644 arch/microblaze/include/asm/timex.h
delete mode 100644 arch/sh/include/asm/timex.h
delete mode 100644 arch/sparc/include/asm/timex_32.h
delete mode 100644 arch/um/include/asm/timex.h
diff --git a/arch/Kconfig b/arch/Kconfig
index fa7507ac8e13..3d8550b12312 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -363,6 +363,9 @@ config ARCH_HAS_DMA_CLEAR_UNCACHED
config ARCH_HAS_CPU_FINALIZE_INIT
bool
+config ARCH_HAS_DELAY_TIMER
+ bool
+
# The architecture has a per-task state that includes the mm's PASID
config ARCH_HAS_CPU_PASID
bool
diff --git a/arch/alpha/include/asm/timex.h b/arch/alpha/include/asm/timex.h
index f89798da8a14..5a71ba6136b9 100644
--- a/arch/alpha/include/asm/timex.h
+++ b/arch/alpha/include/asm/timex.h
@@ -7,10 +7,6 @@
#ifndef _ASMALPHA_TIMEX_H
#define _ASMALPHA_TIMEX_H
-/* With only one or two oddballs, we use the RTC as the ticker, selecting
- the 32.768kHz reference clock, which nicely divides down to our HZ. */
-#define CLOCK_TICK_RATE 32768
-
/*
* Standard way to access the cycle counter.
* Currently only used on SMP for scheduling.
diff --git a/arch/arc/include/asm/timex.h b/arch/arc/include/asm/timex.h
deleted file mode 100644
index 48b3482bc97f..000000000000
--- a/arch/arc/include/asm/timex.h
+++ /dev/null
@@ -1,15 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
- */
-
-#ifndef _ASM_ARC_TIMEX_H
-#define _ASM_ARC_TIMEX_H
-
-#define CLOCK_TICK_RATE 80000000 /* slated to be removed */
-
-#include <asm-generic/timex.h>
-
-/* XXX: get_cycles() to be implemented with RTSC insn */
-
-#endif /* _ASM_ARC_TIMEX_H */
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 9187240a02db..7788949992f4 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -11,6 +11,7 @@ config ARM
select ARCH_HAS_CPU_FINALIZE_INIT if MMU
select ARCH_HAS_CURRENT_STACK_POINTER
select ARCH_HAS_DEBUG_VIRTUAL if MMU
+ select ARCH_HAS_DELAY_TIMER
select ARCH_HAS_DMA_ALLOC if MMU
select ARCH_HAS_DMA_OPS
select ARCH_HAS_DMA_WRITE_COMBINE if !ARM_DMA_MEM_BUFFERABLE
diff --git a/arch/arm/include/asm/delay.h b/arch/arm/include/asm/delay.h
index 1d069e558d8d..d2231deb90fa 100644
--- a/arch/arm/include/asm/delay.h
+++ b/arch/arm/include/asm/delay.h
@@ -91,7 +91,6 @@ extern void __loop_udelay(unsigned long usecs);
extern void __loop_const_udelay(unsigned long);
/* Delay-loop timer registration. */
-#define ARCH_HAS_READ_CURRENT_TIMER
extern void register_current_timer_delay(const struct delay_timer *timer);
#endif /* __ASSEMBLY__ */
diff --git a/arch/arm/include/asm/timex.h b/arch/arm/include/asm/timex.h
index 6d1337c169cd..94e40c19cfc5 100644
--- a/arch/arm/include/asm/timex.h
+++ b/arch/arm/include/asm/timex.h
@@ -10,7 +10,10 @@
#define _ASMARM_TIMEX_H
typedef unsigned long cycles_t;
-#define get_cycles() ({ cycles_t c; read_current_timer(&c) ? 0 : c; })
+// Temporary workaround until timex.h is cleaned up
+bool delay_read_timer(unsigned long *t);
+
+#define get_cycles() ({ cycles_t c; delay_read_timer(&c) ? 0 : c; })
#define random_get_entropy() (((unsigned long)get_cycles()) ?: random_get_entropy_fallback())
#endif
diff --git a/arch/arm/lib/delay.c b/arch/arm/lib/delay.c
index b7fe84f68bf1..7e9304012a68 100644
--- a/arch/arm/lib/delay.c
+++ b/arch/arm/lib/delay.c
@@ -12,7 +12,6 @@
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
-#include <linux/timex.h>
/*
* Default to the loop-based delay implementation.
@@ -27,15 +26,14 @@ static const struct delay_timer *delay_timer;
static bool delay_calibrated;
static u64 delay_res;
-int read_current_timer(unsigned long *timer_val)
+bool delay_read_timer(unsigned long *timer_val)
{
if (!delay_timer)
- return -ENXIO;
-
+ return false;
*timer_val = delay_timer->read_current_timer();
- return 0;
+ return true;
}
-EXPORT_SYMBOL_GPL(read_current_timer);
+EXPORT_SYMBOL_GPL(delay_read_timer);
static inline u64 cyc_to_ns(u64 cyc, u32 mult, u32 shift)
{
diff --git a/arch/arm/mach-omap1/Kconfig b/arch/arm/mach-omap1/Kconfig
index b114f7ca2173..2a724aa6674c 100644
--- a/arch/arm/mach-omap1/Kconfig
+++ b/arch/arm/mach-omap1/Kconfig
@@ -74,7 +74,7 @@ config OMAP_32K_TIMER
currently only available for OMAP16XX, 24XX, 34XX, OMAP4/5 and DRA7XX.
On OMAP2PLUS this value is only used for CONFIG_HZ and
- CLOCK_TICK_RATE compile time calculation.
+ timer frequency compile time calculation.
The actual timer selection is done in the board file
through the (DT_)MACHINE_START structure.
diff --git a/arch/hexagon/Kconfig b/arch/hexagon/Kconfig
index d987ba368ed6..b48491140013 100644
--- a/arch/hexagon/Kconfig
+++ b/arch/hexagon/Kconfig
@@ -5,6 +5,7 @@ comment "Linux Kernel Configuration for Hexagon"
config HEXAGON
def_bool y
select ARCH_32BIT_OFF_T
+ select ARCH_HAS_DELAY_TIMER
select ARCH_HAS_SYNC_DMA_FOR_DEVICE
select ARCH_NO_PREEMPT
select ARCH_WANT_FRAME_POINTERS
diff --git a/arch/hexagon/include/asm/timex.h b/arch/hexagon/include/asm/timex.h
deleted file mode 100644
index dfe69e118b2b..000000000000
--- a/arch/hexagon/include/asm/timex.h
+++ /dev/null
@@ -1,23 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
- */
-
-#ifndef _ASM_TIMEX_H
-#define _ASM_TIMEX_H
-
-#include <asm-generic/timex.h>
-#include <asm/hexagon_vm.h>
-
-/* Using TCX0 as our clock. CLOCK_TICK_RATE scheduled to be removed. */
-#define CLOCK_TICK_RATE 19200
-
-#define ARCH_HAS_READ_CURRENT_TIMER
-
-static inline int read_current_timer(unsigned long *timer_val)
-{
- *timer_val = __vmgettime();
- return 0;
-}
-
-#endif
diff --git a/arch/hexagon/kernel/time.c b/arch/hexagon/kernel/time.c
index 6f851e1cd4ee..05c5d6c96d96 100644
--- a/arch/hexagon/kernel/time.c
+++ b/arch/hexagon/kernel/time.c
@@ -6,6 +6,7 @@
*/
#include <linux/init.h>
+#include <linux/delay.h>
#include <linux/clockchips.h>
#include <linux/clocksource.h>
#include <linux/interrupt.h>
@@ -17,7 +18,6 @@
#include <linux/of_irq.h>
#include <linux/module.h>
-#include <asm/delay.h>
#include <asm/hexagon_vm.h>
#include <asm/time.h>
@@ -231,3 +231,9 @@ void __udelay(unsigned long usecs)
cpu_relax(); /* not sure how this improves readability */
}
EXPORT_SYMBOL(__udelay);
+
+bool delay_read_timer(unsigned long *timer_val)
+{
+ *timer_val = __vmgettime();
+ return true;
+}
diff --git a/arch/m68k/include/asm/timex.h b/arch/m68k/include/asm/timex.h
index f4a7a340f4ca..b58115f3a282 100644
--- a/arch/m68k/include/asm/timex.h
+++ b/arch/m68k/include/asm/timex.h
@@ -7,21 +7,6 @@
#ifndef _ASMm68K_TIMEX_H
#define _ASMm68K_TIMEX_H
-#ifdef CONFIG_COLDFIRE
-/*
- * CLOCK_TICK_RATE should give the underlying frequency of the tick timer
- * to make ntp work best. For Coldfires, that's the main clock.
- */
-#include <asm/coldfire.h>
-#define CLOCK_TICK_RATE MCF_CLK
-#else
-/*
- * This default CLOCK_TICK_RATE is probably wrong for many 68k boards
- * Users of those boards will need to check and modify accordingly
- */
-#define CLOCK_TICK_RATE 1193180 /* Underlying HZ */
-#endif
-
typedef unsigned long cycles_t;
static inline cycles_t get_cycles(void)
diff --git a/arch/microblaze/include/asm/timex.h b/arch/microblaze/include/asm/timex.h
deleted file mode 100644
index e99cc29cbe57..000000000000
--- a/arch/microblaze/include/asm/timex.h
+++ /dev/null
@@ -1,13 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * Copyright (C) 2006 Atmark Techno, Inc.
- */
-
-#ifndef _ASM_MICROBLAZE_TIMEX_H
-#define _ASM_MICROBLAZE_TIMEX_H
-
-#include <asm-generic/timex.h>
-
-#define CLOCK_TICK_RATE 1000 /* Timer input freq. */
-
-#endif /* _ASM_TIMEX_H */
diff --git a/arch/mips/include/asm/timex.h b/arch/mips/include/asm/timex.h
index 7ef06dcdc46e..daedc62f0fb8 100644
--- a/arch/mips/include/asm/timex.h
+++ b/arch/mips/include/asm/timex.h
@@ -18,14 +18,6 @@
#include <asm/mipsregs.h>
#include <asm/cpu-type.h>
-/*
- * This is the clock rate of the i8253 PIT. A MIPS system may not have
- * a PIT by the symbol is used all over the kernel including some APIs.
- * So keeping it defined to the number for the PIT is the only sane thing
- * for now.
- */
-#define CLOCK_TICK_RATE 1193182
-
/*
* Standard way to access the cycle counter.
* Currently only used on SMP for scheduling.
diff --git a/arch/openrisc/Kconfig b/arch/openrisc/Kconfig
index 9156635dd264..5eb995c13074 100644
--- a/arch/openrisc/Kconfig
+++ b/arch/openrisc/Kconfig
@@ -7,6 +7,7 @@
config OPENRISC
def_bool y
select ARCH_32BIT_OFF_T
+ select ARCH_HAS_DELAY_TIMER
select ARCH_HAS_DMA_SET_UNCACHED
select ARCH_HAS_DMA_CLEAR_UNCACHED
select ARCH_HAS_SYNC_DMA_FOR_DEVICE
diff --git a/arch/openrisc/include/asm/timex.h b/arch/openrisc/include/asm/timex.h
index 5487fa93dd9b..574e80e6d1f3 100644
--- a/arch/openrisc/include/asm/timex.h
+++ b/arch/openrisc/include/asm/timex.h
@@ -25,9 +25,4 @@ static inline cycles_t get_cycles(void)
}
#define get_cycles get_cycles
-/* This isn't really used any more */
-#define CLOCK_TICK_RATE 1000
-
-#define ARCH_HAS_READ_CURRENT_TIMER
-
#endif
diff --git a/arch/openrisc/lib/delay.c b/arch/openrisc/lib/delay.c
index 5e89e4131304..661f9f8f6292 100644
--- a/arch/openrisc/lib/delay.c
+++ b/arch/openrisc/lib/delay.c
@@ -13,18 +13,17 @@
*/
#include <linux/kernel.h>
+#include <linux/delay.h>
#include <linux/export.h>
#include <linux/init.h>
-#include <linux/timex.h>
+
#include <asm/param.h>
-#include <asm/delay.h>
-#include <asm/timex.h>
#include <asm/processor.h>
-int read_current_timer(unsigned long *timer_value)
+bool delay_read_timer(unsigned long *timer_value)
{
*timer_value = get_cycles();
- return 0;
+ return true;
}
void __delay(unsigned long cycles)
diff --git a/arch/parisc/include/asm/timex.h b/arch/parisc/include/asm/timex.h
index b4622cb06a75..453468ba4e3a 100644
--- a/arch/parisc/include/asm/timex.h
+++ b/arch/parisc/include/asm/timex.h
@@ -9,8 +9,6 @@
#include <asm/special_insns.h>
-#define CLOCK_TICK_RATE 1193180 /* Underlying HZ */
-
typedef unsigned long cycles_t;
static inline cycles_t get_cycles(void)
diff --git a/arch/powerpc/include/asm/timex.h b/arch/powerpc/include/asm/timex.h
index 14b4489de52c..b48b78e47958 100644
--- a/arch/powerpc/include/asm/timex.h
+++ b/arch/powerpc/include/asm/timex.h
@@ -11,8 +11,6 @@
#include <asm/cputable.h>
#include <asm/vdso/timebase.h>
-#define CLOCK_TICK_RATE 1024000 /* Underlying HZ */
-
typedef unsigned long cycles_t;
static inline cycles_t get_cycles(void)
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index c0a6992933e4..a0635743cf8f 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -29,6 +29,7 @@ config RISCV
select ARCH_HAS_DEBUG_VIRTUAL if MMU
select ARCH_HAS_DEBUG_VM_PGTABLE
select ARCH_HAS_DEBUG_WX
+ select ARCH_HAS_DELAY_TIMER
select ARCH_HAS_ELF_CORE_EFLAGS if BINFMT_ELF && ELF_CORE
select ARCH_HAS_FAST_MULTIPLIER
select ARCH_HAS_FORTIFY_SOURCE
diff --git a/arch/riscv/include/asm/timex.h b/arch/riscv/include/asm/timex.h
index a06697846e69..76c9417fdba3 100644
--- a/arch/riscv/include/asm/timex.h
+++ b/arch/riscv/include/asm/timex.h
@@ -80,12 +80,4 @@ static inline u64 get_cycles64(void)
return ((u64)hi << 32) | lo;
}
#endif /* CONFIG_64BIT */
-
-#define ARCH_HAS_READ_CURRENT_TIMER
-static inline int read_current_timer(unsigned long *timer_val)
-{
- *timer_val = get_cycles();
- return 0;
-}
-
#endif /* _ASM_RISCV_TIMEX_H */
diff --git a/arch/riscv/lib/delay.c b/arch/riscv/lib/delay.c
index 49d510ba75fd..bd9b3825656f 100644
--- a/arch/riscv/lib/delay.c
+++ b/arch/riscv/lib/delay.c
@@ -6,7 +6,6 @@
#include <linux/delay.h>
#include <linux/math.h>
#include <linux/param.h>
-#include <linux/timex.h>
#include <linux/types.h>
#include <linux/export.h>
@@ -109,3 +108,9 @@ void ndelay(unsigned long nsecs)
__delay(ncycles >> NDELAY_SHIFT);
}
EXPORT_SYMBOL(ndelay);
+
+bool delay_read_timer(unsigned long *timer_val)
+{
+ *timer_val = get_cycles();
+ return true;
+}
diff --git a/arch/s390/include/asm/timex.h b/arch/s390/include/asm/timex.h
index ac3ab6c29912..23421b6eb225 100644
--- a/arch/s390/include/asm/timex.h
+++ b/arch/s390/include/asm/timex.h
@@ -159,8 +159,6 @@ static inline void local_tick_enable(unsigned long comp)
set_clock_comparator(get_lowcore()->clock_comparator);
}
-#define CLOCK_TICK_RATE 1193180 /* Underlying HZ */
-
typedef unsigned long cycles_t;
static __always_inline unsigned long get_tod_clock(void)
diff --git a/arch/sh/include/asm/timex.h b/arch/sh/include/asm/timex.h
deleted file mode 100644
index f53f95bf4288..000000000000
--- a/arch/sh/include/asm/timex.h
+++ /dev/null
@@ -1,24 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * linux/include/asm-sh/timex.h
- *
- * sh architecture timex specifications
- */
-#ifndef __ASM_SH_TIMEX_H
-#define __ASM_SH_TIMEX_H
-
-/*
- * Only parts using the legacy CPG code for their clock framework
- * implementation need to define their own Pclk value. If provided, this
- * can be used for accurately setting CLOCK_TICK_RATE, otherwise we
- * simply fall back on the i8253 PIT value.
- */
-#ifdef CONFIG_SH_PCLK_FREQ
-#define CLOCK_TICK_RATE (CONFIG_SH_PCLK_FREQ / 4) /* Underlying HZ */
-#else
-#define CLOCK_TICK_RATE 1193180
-#endif
-
-#include <asm-generic/timex.h>
-
-#endif /* __ASM_SH_TIMEX_H */
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 0e9c906c4b5d..a979a4be79a9 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -70,6 +70,7 @@ config SPARC32
config SPARC64
def_bool 64BIT
select ALTERNATE_USER_ADDRESS_SPACE
+ select ARCH_HAS_DELAY_TIMER
select HAVE_FUNCTION_TRACER
select HAVE_FUNCTION_GRAPH_TRACER
select HAVE_KRETPROBES
diff --git a/arch/sparc/include/asm/timex.h b/arch/sparc/include/asm/timex.h
index 9aac26b1f45f..f0f980581590 100644
--- a/arch/sparc/include/asm/timex.h
+++ b/arch/sparc/include/asm/timex.h
@@ -4,6 +4,6 @@
#if defined(__sparc__) && defined(__arch64__)
#include <asm/timex_64.h>
#else
-#include <asm/timex_32.h>
+#include <asm-generic/timex.h>
#endif
#endif
diff --git a/arch/sparc/include/asm/timex_32.h b/arch/sparc/include/asm/timex_32.h
deleted file mode 100644
index f86326a6f89e..000000000000
--- a/arch/sparc/include/asm/timex_32.h
+++ /dev/null
@@ -1,14 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * linux/include/asm/timex.h
- *
- * sparc architecture timex specifications
- */
-#ifndef _ASMsparc_TIMEX_H
-#define _ASMsparc_TIMEX_H
-
-#define CLOCK_TICK_RATE 1193180 /* Underlying HZ */
-
-#include <asm-generic/timex.h>
-
-#endif
diff --git a/arch/sparc/include/asm/timex_64.h b/arch/sparc/include/asm/timex_64.h
index 076c44f6845d..fa004ef3bb9a 100644
--- a/arch/sparc/include/asm/timex_64.h
+++ b/arch/sparc/include/asm/timex_64.h
@@ -9,12 +9,8 @@
#include <asm/timer.h>
-#define CLOCK_TICK_RATE 1193180 /* Underlying HZ */
-
/* Getting on the cycle counter on sparc64. */
typedef unsigned long cycles_t;
#define get_cycles() tick_ops->get_tick()
-#define ARCH_HAS_READ_CURRENT_TIMER
-
#endif
diff --git a/arch/sparc/kernel/time_64.c b/arch/sparc/kernel/time_64.c
index 87b267043ccd..b1c54ab4b15b 100644
--- a/arch/sparc/kernel/time_64.c
+++ b/arch/sparc/kernel/time_64.c
@@ -894,8 +894,8 @@ unsigned long long sched_clock(void)
return ((get_tick() * quotient) >> SPARC64_NSEC_PER_CYC_SHIFT) - offset;
}
-int read_current_timer(unsigned long *timer_val)
+bool delay_read_timer(unsigned long *timer_val)
{
*timer_val = get_tick();
- return 0;
+ return true;
}
diff --git a/arch/um/include/asm/timex.h b/arch/um/include/asm/timex.h
deleted file mode 100644
index 9f27176adb26..000000000000
--- a/arch/um/include/asm/timex.h
+++ /dev/null
@@ -1,9 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef __UM_TIMEX_H
-#define __UM_TIMEX_H
-
-#define CLOCK_TICK_RATE (HZ)
-
-#include <asm-generic/timex.h>
-
-#endif
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index bdad90f210e4..ec9e1d4c85b1 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -80,6 +80,7 @@ config X86
select ARCH_HAS_CURRENT_STACK_POINTER
select ARCH_HAS_DEBUG_VIRTUAL
select ARCH_HAS_DEBUG_VM_PGTABLE if !X86_PAE
+ select ARCH_HAS_DELAY_TIMER
select ARCH_HAS_DEVMEM_IS_ALLOWED
select ARCH_HAS_DMA_OPS if GART_IOMMU || XEN
select ARCH_HAS_EARLY_DEBUG if KGDB
diff --git a/arch/x86/include/asm/timex.h b/arch/x86/include/asm/timex.h
index 6e57e3c0fdd2..f397072cf294 100644
--- a/arch/x86/include/asm/timex.h
+++ b/arch/x86/include/asm/timex.h
@@ -13,9 +13,4 @@ static inline unsigned long random_get_entropy(void)
}
#define random_get_entropy random_get_entropy
-/* Assume we use the PIT time source for the clock tick */
-#define CLOCK_TICK_RATE PIT_TICK_RATE
-
-#define ARCH_HAS_READ_CURRENT_TIMER
-
#endif /* _ASM_X86_TIMEX_H */
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 46882ce79c3a..0e75eb07990b 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -1268,7 +1268,7 @@ void __init setup_arch(char **cmdline_p)
mcheck_init();
- register_refined_jiffies(CLOCK_TICK_RATE);
+ register_refined_jiffies(PIT_TICK_RATE);
#ifdef CONFIG_EFI
if (efi_enabled(EFI_BOOT))
diff --git a/arch/x86/lib/delay.c b/arch/x86/lib/delay.c
index eb2d2e1cbddd..70ad000e91e7 100644
--- a/arch/x86/lib/delay.c
+++ b/arch/x86/lib/delay.c
@@ -14,12 +14,10 @@
#include <linux/export.h>
#include <linux/sched.h>
-#include <linux/timex.h>
#include <linux/preempt.h>
#include <linux/delay.h>
#include <asm/processor.h>
-#include <asm/delay.h>
#include <asm/timer.h>
#include <asm/mwait.h>
@@ -189,13 +187,13 @@ void use_mwaitx_delay(void)
delay_fn = delay_halt;
}
-int read_current_timer(unsigned long *timer_val)
+bool delay_read_timer(unsigned long *timer_val)
{
if (delay_fn == delay_tsc) {
*timer_val = rdtsc();
- return 0;
+ return true;
}
- return -1;
+ return false;
}
void __delay(unsigned long loops)
diff --git a/include/asm-generic/timex.h b/include/asm-generic/timex.h
index 50ba9b5ce983..2032fda7052c 100644
--- a/include/asm-generic/timex.h
+++ b/include/asm-generic/timex.h
@@ -13,11 +13,4 @@ static inline cycles_t get_cycles(void)
}
#endif
-/*
- * Architectures are encouraged to implement read_current_timer
- * and define this in order to avoid the expensive delay loop
- * calibration during boot.
- */
-#undef ARCH_HAS_READ_CURRENT_TIMER
-
#endif /* __ASM_GENERIC_TIMEX_H */
diff --git a/include/linux/delay.h b/include/linux/delay.h
index 68b2a69dd24d..82409e55b6ae 100644
--- a/include/linux/delay.h
+++ b/include/linux/delay.h
@@ -17,6 +17,8 @@ extern unsigned long loops_per_jiffy;
#include <asm/delay.h>
+bool delay_read_timer(unsigned long *t);
+
/*
* Using udelay() for intervals greater than a few milliseconds can
* risk overflow for high loops_per_jiffy (high bogomips) machines. The
diff --git a/include/linux/timex.h b/include/linux/timex.h
index 4ee32eff3f22..7014ccc638fc 100644
--- a/include/linux/timex.h
+++ b/include/linux/timex.h
@@ -156,8 +156,6 @@ extern int do_clock_adjtime(const clockid_t which_clock, struct __kernel_timex *
extern void hardpps(const struct timespec64 *, const struct timespec64 *);
-int read_current_timer(unsigned long *timer_val);
-
/* The clock frequency of the i8253/i8254 PIT */
#define PIT_TICK_RATE 1193182ul
diff --git a/init/calibrate.c b/init/calibrate.c
index 63be4c65bc52..2bfe97034e42 100644
--- a/init/calibrate.c
+++ b/init/calibrate.c
@@ -13,7 +13,6 @@
#include <linux/printk.h>
#include <linux/smp.h>
#include <linux/stddef.h>
-#include <linux/timex.h>
unsigned long lpj_fine;
unsigned long preset_lpj;
@@ -25,9 +24,9 @@ static int __init lpj_setup(char *str)
__setup("lpj=", lpj_setup);
-#ifdef ARCH_HAS_READ_CURRENT_TIMER
+#ifdef CONFIG_ARCH_HAS_DELAY_TIMER
-/* This routine uses the read_current_timer() routine and gets the
+/* This routine uses the delay_read_timer() routine and gets the
* loops per jiffy directly, instead of guessing it using delay().
* Also, this code tries to handle non-maskable asynchronous events
* (like SMIs)
@@ -48,13 +47,13 @@ static unsigned long calibrate_delay_direct(void)
int min = -1;
int i;
- if (read_current_timer(&pre_start) < 0 )
+ if (!delay_read_timer(&pre_start))
return 0;
/*
* A simple loop like
* while ( jiffies < start_jiffies+1)
- * start = read_current_timer();
+ * start = delay_read_timer();
* will not do. As we don't really know whether jiffy switch
* happened first or timer_value was read first. And some asynchronous
* event can happen between these two events introducing errors in lpj.
@@ -72,22 +71,22 @@ static unsigned long calibrate_delay_direct(void)
for (i = 0; i < MAX_DIRECT_CALIBRATION_RETRIES; i++) {
pre_start = 0;
- read_current_timer(&start);
+ delay_read_timer(&start);
start_jiffies = jiffies;
while (time_before_eq(jiffies, start_jiffies + 1)) {
pre_start = start;
- read_current_timer(&start);
+ delay_read_timer(&start);
}
- read_current_timer(&post_start);
+ delay_read_timer(&post_start);
pre_end = 0;
end = post_start;
while (time_before_eq(jiffies, start_jiffies + 1 +
DELAY_CALIBRATION_TICKS)) {
pre_end = end;
- read_current_timer(&end);
+ delay_read_timer(&end);
}
- read_current_timer(&post_end);
+ delay_read_timer(&post_end);
timer_rate_max = (post_end - pre_start) /
DELAY_CALIBRATION_TICKS;