diff options
author | Arnd Bergmann <arnd@arndb.de> | 2020-09-24 11:32:40 +0200 |
---|---|---|
committer | Arnd Bergmann <arnd@arndb.de> | 2020-10-30 21:57:07 +0100 |
commit | 0774a6ed294b963dc76df2d8342ab86d030759ec (patch) | |
tree | ee12b2df3a2a74f576ae42d1487e9a9b37c13e54 | |
parent | timekeeping: remove xtime_update (diff) | |
download | linux-0774a6ed294b963dc76df2d8342ab86d030759ec.tar.xz linux-0774a6ed294b963dc76df2d8342ab86d030759ec.zip |
timekeeping: default GENERIC_CLOCKEVENTS to enabled
Almost all machines use GENERIC_CLOCKEVENTS, so it feels wrong to
require each one to select that symbol manually.
Instead, enable it whenever CONFIG_LEGACY_TIMER_TICK is disabled as
a simplification. It should be possible to select both
GENERIC_CLOCKEVENTS and LEGACY_TIMER_TICK from an architecture now
and decide at runtime between the two.
For the clockevents arch-support.txt file, this means that additional
architectures are marked as TODO when they have at least one machine
that still uses LEGACY_TIMER_TICK, rather than being marked 'ok' when
at least one machine has been converted. This means that both m68k and
arm (for riscpc) revert to TODO.
At this point, we could just always enable CONFIG_GENERIC_CLOCKEVENTS
rather than leaving it off when not needed. I built an m68k
defconfig kernel (using gcc-10.1.0) and found that this would add
around 5.5KB in kernel image size:
text data bss dec hex filename
3861936 1092236 196656 5150828 4e986c obj-m68k/vmlinux-no-clockevent
3866201 1093832 196184 5156217 4ead79 obj-m68k/vmlinux-clockevent
On Arm (MACH_RPC), that difference appears to be twice as large,
around 11KB on top of an 6MB vmlinux.
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Tested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
-rw-r--r-- | Documentation/features/time/clockevents/arch-support.txt | 6 | ||||
-rw-r--r-- | arch/alpha/Kconfig | 1 | ||||
-rw-r--r-- | arch/arc/Kconfig | 1 | ||||
-rw-r--r-- | arch/arm/Kconfig | 12 | ||||
-rw-r--r-- | arch/arm64/Kconfig | 1 | ||||
-rw-r--r-- | arch/arm64/Kconfig.platforms | 1 | ||||
-rw-r--r-- | arch/c6x/Kconfig | 1 | ||||
-rw-r--r-- | arch/csky/Kconfig | 1 | ||||
-rw-r--r-- | arch/h8300/Kconfig | 1 | ||||
-rw-r--r-- | arch/hexagon/Kconfig | 1 | ||||
-rw-r--r-- | arch/m68k/Kconfig.cpu | 1 | ||||
-rw-r--r-- | arch/microblaze/Kconfig | 1 | ||||
-rw-r--r-- | arch/mips/Kconfig | 1 | ||||
-rw-r--r-- | arch/nds32/Kconfig | 1 | ||||
-rw-r--r-- | arch/nios2/Kconfig | 1 | ||||
-rw-r--r-- | arch/openrisc/Kconfig | 1 | ||||
-rw-r--r-- | arch/powerpc/Kconfig | 1 | ||||
-rw-r--r-- | arch/riscv/Kconfig | 1 | ||||
-rw-r--r-- | arch/s390/Kconfig | 1 | ||||
-rw-r--r-- | arch/sh/Kconfig | 1 | ||||
-rw-r--r-- | arch/sparc/Kconfig | 1 | ||||
-rw-r--r-- | arch/um/Kconfig | 1 | ||||
-rw-r--r-- | arch/x86/Kconfig | 1 | ||||
-rw-r--r-- | arch/xtensa/Kconfig | 1 | ||||
-rw-r--r-- | kernel/time/Kconfig | 2 |
25 files changed, 4 insertions, 38 deletions
diff --git a/Documentation/features/time/clockevents/arch-support.txt b/Documentation/features/time/clockevents/arch-support.txt index 61a5c9d68c15..6863a3fbddad 100644 --- a/Documentation/features/time/clockevents/arch-support.txt +++ b/Documentation/features/time/clockevents/arch-support.txt @@ -1,6 +1,6 @@ # # Feature name: clockevents -# Kconfig: GENERIC_CLOCKEVENTS +# Kconfig: !LEGACY_TIMER_TICK # description: arch support generic clock events # ----------------------- @@ -8,14 +8,14 @@ ----------------------- | alpha: | ok | | arc: | ok | - | arm: | ok | + | arm: | TODO | | arm64: | ok | | c6x: | ok | | csky: | ok | | h8300: | ok | | hexagon: | ok | | ia64: | TODO | - | m68k: | ok | + | m68k: | TODO | | microblaze: | ok | | mips: | ok | | nds32: | ok | diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig index d6e9fc7a7b19..f0a700946cac 100644 --- a/arch/alpha/Kconfig +++ b/arch/alpha/Kconfig @@ -27,7 +27,6 @@ config ALPHA select ARCH_WANT_IPC_PARSE_VERSION select ARCH_HAVE_NMI_SAFE_CMPXCHG select AUDIT_ARCH - select GENERIC_CLOCKEVENTS select GENERIC_CPU_VULNERABILITIES select GENERIC_SMP_IDLE_THREAD select GENERIC_STRNCPY_FROM_USER diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig index 0a89cc9def65..061eb8e23739 100644 --- a/arch/arc/Kconfig +++ b/arch/arc/Kconfig @@ -19,7 +19,6 @@ config ARC select COMMON_CLK select DMA_DIRECT_REMAP select GENERIC_ATOMIC64 if !ISA_ARCV2 || !(ARC_HAS_LL64 && ARC_HAS_LLSC) - select GENERIC_CLOCKEVENTS select GENERIC_FIND_FIRST_BIT # for now, we don't need GENERIC_IRQ_PROBE, CONFIG_GENERIC_IRQ_CHIP select GENERIC_IRQ_SHOW diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index a652686c3b32..446c6c88e47f 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -321,7 +321,6 @@ config ARCH_MULTIPLATFORM select AUTO_ZRELADDR select TIMER_OF select COMMON_CLK - select GENERIC_CLOCKEVENTS select GENERIC_IRQ_MULTI_HANDLER select HAVE_PCI select PCI_DOMAINS_GENERIC if PCI @@ -336,7 +335,6 @@ config ARM_SINGLE_ARMV7M select TIMER_OF select COMMON_CLK select CPU_V7M - select GENERIC_CLOCKEVENTS select NO_IOPORT_MAP select SPARSE_IRQ select USE_OF @@ -351,7 +349,6 @@ config ARCH_EP93XX select CLKDEV_LOOKUP select CLKSRC_MMIO select CPU_ARM920T - select GENERIC_CLOCKEVENTS select GPIOLIB select HAVE_LEGACY_CLK help @@ -361,7 +358,6 @@ config ARCH_FOOTBRIDGE bool "FootBridge" select CPU_SA110 select FOOTBRIDGE - select GENERIC_CLOCKEVENTS select HAVE_IDE select NEED_MACH_IO_H if !MMU select NEED_MACH_MEMORY_H @@ -389,7 +385,6 @@ config ARCH_IXP4XX select ARCH_SUPPORTS_BIG_ENDIAN select CPU_XSCALE select DMABOUNCE if PCI - select GENERIC_CLOCKEVENTS select GENERIC_IRQ_MULTI_HANDLER select GPIO_IXP4XX select GPIOLIB @@ -405,7 +400,6 @@ config ARCH_IXP4XX config ARCH_DOVE bool "Marvell Dove" select CPU_PJ4 - select GENERIC_CLOCKEVENTS select GENERIC_IRQ_MULTI_HANDLER select GPIOLIB select HAVE_PCI @@ -429,7 +423,6 @@ config ARCH_PXA select CLKSRC_MMIO select TIMER_OF select CPU_XSCALE if !CPU_XSC3 - select GENERIC_CLOCKEVENTS select GENERIC_IRQ_MULTI_HANDLER select GPIO_PXA select GPIOLIB @@ -470,7 +463,6 @@ config ARCH_SA1100 select COMMON_CLK select CPU_FREQ select CPU_SA1100 - select GENERIC_CLOCKEVENTS select GENERIC_IRQ_MULTI_HANDLER select GPIOLIB select HAVE_IDE @@ -485,7 +477,6 @@ config ARCH_S3C24XX bool "Samsung S3C24XX SoCs" select ATAGS select CLKSRC_SAMSUNG_PWM - select GENERIC_CLOCKEVENTS select GPIO_SAMSUNG select GPIOLIB select GENERIC_IRQ_MULTI_HANDLER @@ -509,7 +500,6 @@ config ARCH_OMAP1 select ARCH_OMAP select CLKDEV_LOOKUP select CLKSRC_MMIO - select GENERIC_CLOCKEVENTS select GENERIC_IRQ_CHIP select GENERIC_IRQ_MULTI_HANDLER select GPIOLIB @@ -772,7 +762,6 @@ config ARCH_ACORN config PLAT_IOP bool - select GENERIC_CLOCKEVENTS config PLAT_ORION bool @@ -1163,7 +1152,6 @@ config HAVE_SMP config SMP bool "Symmetric Multi-Processing" depends on CPU_V6K || CPU_V7 - depends on GENERIC_CLOCKEVENTS depends on HAVE_SMP depends on MMU || ARM_MPU select IRQ_WORK diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index f858c352f72a..fee87e4104fd 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -101,7 +101,6 @@ config ARM64 select FRAME_POINTER select GENERIC_ALLOCATOR select GENERIC_ARCH_TOPOLOGY - select GENERIC_CLOCKEVENTS select GENERIC_CLOCKEVENTS_BROADCAST select GENERIC_CPU_AUTOPROBE select GENERIC_CPU_VULNERABILITIES diff --git a/arch/arm64/Kconfig.platforms b/arch/arm64/Kconfig.platforms index 6f2494dd6d60..748e6d8c3b94 100644 --- a/arch/arm64/Kconfig.platforms +++ b/arch/arm64/Kconfig.platforms @@ -256,7 +256,6 @@ config ARCH_TEGRA select ARM_GIC_PM select CLKSRC_MMIO select TIMER_OF - select GENERIC_CLOCKEVENTS select GPIOLIB select PINCTRL select PM diff --git a/arch/c6x/Kconfig b/arch/c6x/Kconfig index 48d66bf0465d..bdeeac28b1be 100644 --- a/arch/c6x/Kconfig +++ b/arch/c6x/Kconfig @@ -19,7 +19,6 @@ config C6X select IRQ_DOMAIN select OF select OF_EARLY_FLATTREE - select GENERIC_CLOCKEVENTS select MODULES_USE_ELF_RELA select MMU_GATHER_NO_RANGE if MMU select SET_FS diff --git a/arch/csky/Kconfig b/arch/csky/Kconfig index 268fad5f51cf..28fdf8303dff 100644 --- a/arch/csky/Kconfig +++ b/arch/csky/Kconfig @@ -28,7 +28,6 @@ config CSKY select GENERIC_LIB_UCMPDI2 select GENERIC_ALLOCATOR select GENERIC_ATOMIC64 - select GENERIC_CLOCKEVENTS select GENERIC_CPU_DEVICES select GENERIC_IRQ_CHIP select GENERIC_IRQ_PROBE diff --git a/arch/h8300/Kconfig b/arch/h8300/Kconfig index 7945de067e9f..3e3e0f16f7e0 100644 --- a/arch/h8300/Kconfig +++ b/arch/h8300/Kconfig @@ -12,7 +12,6 @@ config H8300 select FRAME_POINTER select GENERIC_CPU_DEVICES select MODULES_USE_ELF_RELA - select GENERIC_CLOCKEVENTS select COMMON_CLK select ARCH_WANT_FRAME_POINTERS select OF diff --git a/arch/hexagon/Kconfig b/arch/hexagon/Kconfig index f2afabbadd43..6e00c16a36b5 100644 --- a/arch/hexagon/Kconfig +++ b/arch/hexagon/Kconfig @@ -27,7 +27,6 @@ config HEXAGON select GENERIC_IOMAP select GENERIC_SMP_IDLE_THREAD select STACKTRACE_SUPPORT - select GENERIC_CLOCKEVENTS select GENERIC_CLOCKEVENTS_BROADCAST select MODULES_USE_ELF_RELA select GENERIC_CPU_DEVICES diff --git a/arch/m68k/Kconfig.cpu b/arch/m68k/Kconfig.cpu index 648054d4f860..ce09f993d858 100644 --- a/arch/m68k/Kconfig.cpu +++ b/arch/m68k/Kconfig.cpu @@ -318,7 +318,6 @@ config M54xx config COLDFIRE_PIT_TIMER bool - select GENERIC_CLOCKEVENTS config COLDFIRE_TIMERS bool diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig index 33925ffed68f..2f0d3f431faf 100644 --- a/arch/microblaze/Kconfig +++ b/arch/microblaze/Kconfig @@ -17,7 +17,6 @@ config MICROBLAZE select COMMON_CLK select DMA_DIRECT_REMAP if MMU select GENERIC_ATOMIC64 - select GENERIC_CLOCKEVENTS select GENERIC_CPU_DEVICES select GENERIC_IDLE_POLL_SETUP select GENERIC_IRQ_PROBE diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 2000bb2b0220..077c4ae09550 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -21,7 +21,6 @@ config MIPS select CPU_NO_EFFICIENT_FFS if (TARGET_ISA_REV < 1) select CPU_PM if CPU_IDLE select GENERIC_ATOMIC64 if !64BIT - select GENERIC_CLOCKEVENTS select GENERIC_CMOS_UPDATE select GENERIC_CPU_AUTOPROBE select GENERIC_GETTIMEOFDAY diff --git a/arch/nds32/Kconfig b/arch/nds32/Kconfig index e8e541fd2267..62313902d75d 100644 --- a/arch/nds32/Kconfig +++ b/arch/nds32/Kconfig @@ -17,7 +17,6 @@ config NDS32 select DMA_DIRECT_REMAP select GENERIC_ATOMIC64 select GENERIC_CPU_DEVICES - select GENERIC_CLOCKEVENTS select GENERIC_IRQ_CHIP select GENERIC_IRQ_SHOW select GENERIC_IOREMAP diff --git a/arch/nios2/Kconfig b/arch/nios2/Kconfig index c7c6ba6bec9d..c24955c81c92 100644 --- a/arch/nios2/Kconfig +++ b/arch/nios2/Kconfig @@ -10,7 +10,6 @@ config NIOS2 select COMMON_CLK select TIMER_OF select GENERIC_ATOMIC64 - select GENERIC_CLOCKEVENTS select GENERIC_CPU_DEVICES select GENERIC_IRQ_PROBE select GENERIC_IRQ_SHOW diff --git a/arch/openrisc/Kconfig b/arch/openrisc/Kconfig index 6233c6293180..591acc5990dc 100644 --- a/arch/openrisc/Kconfig +++ b/arch/openrisc/Kconfig @@ -24,7 +24,6 @@ config OPENRISC select GENERIC_CPU_DEVICES select HAVE_UID16 select GENERIC_ATOMIC64 - select GENERIC_CLOCKEVENTS select GENERIC_CLOCKEVENTS_BROADCAST select GENERIC_STRNCPY_FROM_USER select GENERIC_STRNLEN_USER diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index e9f13fe08492..57e2c75f76e9 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -163,7 +163,6 @@ config PPC select EDAC_ATOMIC_SCRUB select EDAC_SUPPORT select GENERIC_ATOMIC64 if PPC32 - select GENERIC_CLOCKEVENTS select GENERIC_CLOCKEVENTS_BROADCAST if SMP select GENERIC_CMOS_UPDATE select GENERIC_CPU_AUTOPROBE diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 44377fd7860e..3842bbb4fe62 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -37,7 +37,6 @@ config RISCV select EDAC_SUPPORT select GENERIC_ARCH_TOPOLOGY if SMP select GENERIC_ATOMIC64 if !64BIT - select GENERIC_CLOCKEVENTS select GENERIC_EARLY_IOREMAP select GENERIC_GETTIMEOFDAY if HAVE_GENERIC_VDSO select GENERIC_IOREMAP diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index 4a2a12be04c9..db246781844d 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -116,7 +116,6 @@ config S390 select CLONE_BACKWARDS2 select DMA_OPS if PCI select DYNAMIC_FTRACE if FUNCTION_TRACER - select GENERIC_CLOCKEVENTS select GENERIC_CPU_AUTOPROBE select GENERIC_CPU_VULNERABILITIES select GENERIC_FIND_FIRST_BIT diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig index 159da4ed578f..5fa580219a86 100644 --- a/arch/sh/Kconfig +++ b/arch/sh/Kconfig @@ -16,7 +16,6 @@ config SUPERH select CPU_NO_EFFICIENT_FFS select DMA_DECLARE_COHERENT select GENERIC_ATOMIC64 - select GENERIC_CLOCKEVENTS select GENERIC_CMOS_UPDATE if SH_SH03 || SH_DREAMCAST select GENERIC_IDLE_POLL_SETUP select GENERIC_IRQ_SHOW diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig index a6ca135442f9..718c51cf2c6c 100644 --- a/arch/sparc/Kconfig +++ b/arch/sparc/Kconfig @@ -39,7 +39,6 @@ config SPARC select HAVE_EBPF_JIT if SPARC64 select HAVE_DEBUG_BUGVERBOSE select GENERIC_SMP_IDLE_THREAD - select GENERIC_CLOCKEVENTS select GENERIC_STRNCPY_FROM_USER select GENERIC_STRNLEN_USER select MODULES_USE_ELF_RELA diff --git a/arch/um/Kconfig b/arch/um/Kconfig index 4b799fad8b48..43333e36e0ba 100644 --- a/arch/um/Kconfig +++ b/arch/um/Kconfig @@ -17,7 +17,6 @@ config UML select NO_DMA select GENERIC_IRQ_SHOW select GENERIC_CPU_DEVICES - select GENERIC_CLOCKEVENTS select HAVE_GCC_PLUGINS select SET_FS select TTY # Needed for line.c diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index f6946b81f74a..0498d7596ccc 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -108,7 +108,6 @@ config X86 select DCACHE_WORD_ACCESS select EDAC_ATOMIC_SCRUB select EDAC_SUPPORT - select GENERIC_CLOCKEVENTS select GENERIC_CLOCKEVENTS_BROADCAST if X86_64 || (X86_32 && X86_LOCAL_APIC) select GENERIC_CLOCKEVENTS_MIN_ADJUST select GENERIC_CMOS_UPDATE diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig index d0dfa50bd0bb..2611ba336af8 100644 --- a/arch/xtensa/Kconfig +++ b/arch/xtensa/Kconfig @@ -16,7 +16,6 @@ config XTENSA select COMMON_CLK select DMA_REMAP if MMU select GENERIC_ATOMIC64 - select GENERIC_CLOCKEVENTS select GENERIC_IRQ_SHOW select GENERIC_PCI_IOMAP select GENERIC_SCHED_CLOCK diff --git a/kernel/time/Kconfig b/kernel/time/Kconfig index c6867f29d279..9a41848b6ebb 100644 --- a/kernel/time/Kconfig +++ b/kernel/time/Kconfig @@ -28,7 +28,7 @@ config GENERIC_TIME_VSYSCALL # The generic clock events infrastructure config GENERIC_CLOCKEVENTS - bool + def_bool !LEGACY_TIMER_TICK # Architecture can handle broadcast in a driver-agnostic way config ARCH_HAS_TICK_BROADCAST |