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0774a6ed29
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>
145 lines
3 KiB
Text
145 lines
3 KiB
Text
# SPDX-License-Identifier: GPL-2.0
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# Hexagon configuration
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comment "Linux Kernel Configuration for Hexagon"
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config HEXAGON
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def_bool y
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select ARCH_32BIT_OFF_T
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select ARCH_HAS_SYNC_DMA_FOR_DEVICE
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select ARCH_NO_PREEMPT
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select HAVE_OPROFILE
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# Other pending projects/to-do items.
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# select HAVE_REGS_AND_STACK_ACCESS_API
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# select HAVE_HW_BREAKPOINT if PERF_EVENTS
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# select ARCH_HAS_CPU_IDLE_WAIT
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# select GPIOLIB
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# select HAVE_CLK
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# select GENERIC_PENDING_IRQ if SMP
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select GENERIC_ATOMIC64
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select HAVE_PERF_EVENTS
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# GENERIC_ALLOCATOR is used by dma_alloc_coherent()
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select GENERIC_ALLOCATOR
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select GENERIC_IRQ_SHOW
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select HAVE_ARCH_KGDB
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select HAVE_ARCH_TRACEHOOK
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select NEED_SG_DMA_LENGTH
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select NO_IOPORT_MAP
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select GENERIC_IOMAP
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select GENERIC_SMP_IDLE_THREAD
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select STACKTRACE_SUPPORT
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select GENERIC_CLOCKEVENTS_BROADCAST
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select MODULES_USE_ELF_RELA
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select GENERIC_CPU_DEVICES
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select SET_FS
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help
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Qualcomm Hexagon is a processor architecture designed for high
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performance and low power across a wide variety of applications.
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config HEXAGON_PHYS_OFFSET
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def_bool y
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help
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Platforms that don't load the kernel at zero set this.
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config FRAME_POINTER
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def_bool y
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config LOCKDEP_SUPPORT
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def_bool y
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config EARLY_PRINTK
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def_bool y
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config MMU
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def_bool y
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config TRACE_IRQFLAGS_SUPPORT
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def_bool y
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config GENERIC_CSUM
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def_bool y
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#
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# Use the generic interrupt handling code in kernel/irq/:
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#
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config GENERIC_IRQ_PROBE
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def_bool y
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config GENERIC_HWEIGHT
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def_bool y
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config STACKTRACE_SUPPORT
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def_bool y
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select STACKTRACE
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config GENERIC_BUG
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def_bool y
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depends on BUG
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menu "Machine selection"
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choice
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prompt "System type"
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default HEXAGON_COMET
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config HEXAGON_COMET
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bool "Comet Board"
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help
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Support for the Comet platform.
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endchoice
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config HEXAGON_ARCH_VERSION
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int "Architecture version"
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default 2
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config CMDLINE
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string "Default kernel command string"
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default ""
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help
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On some platforms, there is currently no way for the boot loader
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to pass arguments to the kernel. For these, you should supply some
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command-line options at build time by entering them here. At a
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minimum, you should specify the memory size and the root device
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(e.g., mem=64M root=/dev/nfs).
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config SMP
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bool "Multi-Processing support"
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help
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Enables SMP support in the kernel. If unsure, say "Y"
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config NR_CPUS
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int "Maximum number of CPUs" if SMP
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range 2 6 if SMP
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default "1" if !SMP
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default "6" if SMP
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help
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This allows you to specify the maximum number of CPUs which this
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kernel will support. The maximum supported value is 6 and the
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minimum value which makes sense is 2.
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This is purely to save memory - each supported CPU adds
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approximately eight kilobytes to the kernel image.
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choice
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prompt "Kernel page size"
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default PAGE_SIZE_4KB
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help
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Changes the default page size; use with caution.
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config PAGE_SIZE_4KB
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bool "4KB"
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config PAGE_SIZE_16KB
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bool "16KB"
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config PAGE_SIZE_64KB
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bool "64KB"
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config PAGE_SIZE_256KB
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bool "256KB"
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endchoice
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source "kernel/Kconfig.hz"
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endmenu
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