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/linux/drivers/cpufreq/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0-only
16 <file:Documentation/admin-guide/pm/cpufreq.rst>.
41 default CPU_FREQ_DEFAULT_GOV_SCHEDUTIL if (X86_INTEL_PSTATE || X86_AMD_PSTATE) && SMP
74 depends on !(X86_INTEL_PSTATE && SMP)
79 you to get a full dynamic frequency capable system by simply
80 loading your cpufreq low-level hardware driver.
87 depends on !(X86_INTEL_PSTATE && SMP)
92 you to get a full dynamic frequency capable system by simply
93 loading your cpufreq low-level hardware driver.
100 depends on SMP
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/linux/arch/parisc/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0
49 select GENERIC_ARCH_TOPOLOGY if SMP
50 select ARCH_SUPPORTS_SCHED_MC if SMP && PA8X00
51 select GENERIC_CPU_DEVICES if !SMP
77 select GENERIC_IRQ_MIGRATION if SMP
78 select HAVE_UNSTABLE_SCHED_CLOCK if SMP
87 select HAVE_DYNAMIC_FTRACE if $(cc-option,-fpatchable-function-entry=1,1)
97 The PA-RISC microprocessor is designed by Hewlett-Packard and used
99 and later HP3000 series). The PA-RISC Linux project home page is
114 depends on SMP && PREEMPTION
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/linux/arch/mips/include/asm/
H A Dtimex.h17 #include <asm/cpu-features.h>
19 #include <asm/cpu-type.h>
31 * Currently only used on SMP for scheduling.
37 * We know that all SMP capable CPUs have cycle counters.
82 * Like get_cycles - but where c0_count is not available we desperately
96 return (random_get_entropy_fallback() << 6) | (0x3f - c0_random); in random_get_entropy()
/linux/drivers/cpuidle/
H A DKconfig.arm1 # SPDX-License-Identifier: GPL-2.0-only
13 at run-time through DT nodes. The CPUidle suspend backend is
24 It provides an idle driver that is capable of detecting and
28 - If the idle states are described with the non-hierarchical layout,
31 - If the idle states are described with the hierarchical layout,
56 define different C-states for little and big cores through the
85 bool "Cpu Idle Driver for the ST-E u8500 processors"
88 Select this to enable cpuidle for ST-E u8500 processors.
100 select ARCH_NEEDS_CPU_IDLE_COUPLED if SMP
114 select ARCH_NEEDS_CPU_IDLE_COUPLED if SMP
/linux/arch/arm/mach-omap2/
H A Domap-smp.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * OMAP4 SMP source file. It contains platform specific functions
4 * needed for the linux smp kernel.
11 * Platform file needed for the OMAP4 SMP. This file is based on arm
12 * realview smp platform.
17 #include <linux/smp.h>
19 #include <linux/irqchip/arm-gic.h>
25 #include "omap-secure.h"
26 #include "omap-wakeupgen.h"
87 * BIT(27) - Disables streaming. All write-allocate lines allocate in in omap5_erratum_workaround_801819()
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/linux/arch/arm/mach-exynos/
H A Dexynos.c1 // SPDX-License-Identifier: GPL-2.0
5 // Copyright (c) 2010-2014 Samsung Electronics Co., Ltd.
15 #include <linux/soc/samsung/exynos-regs-pmu.h>
18 #include <asm/hardware/cache-l2x0.h>
33 .id = -1,
52 for_each_compatible_node(node, NULL, "samsung,exynos4210-sysram") { in exynos_sysram_init()
64 for_each_compatible_node(node, NULL, "samsung,exynos4210-sysram-ns") { in exynos_sysram_init()
80 if (!of_flat_dt_is_compatible(node, "samsung,exynos4210-chipid")) in exynos_fdt_map_chipid()
88 iodesc.length = be32_to_cpu(reg[1]) - 1; in exynos_fdt_map_chipid()
110 * Set or clear the USE_DELAYED_RESET_ASSERTION option. Used by smp code
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/linux/arch/sh/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0
80 <http://www.linux-sh.org/>.
94 depends on SMP && PREEMPTION
213 prompt "Processor sub-type selection"
219 # SH-2 Processor Support
230 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
232 # SH-2A Processor Support
278 bool "Support MX-G processor"
282 Select MX-G if running on an R8A03022BG part.
284 # SH-3 Processor Support
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/linux/arch/arm64/kernel/
H A Dhyp-stub.S1 /* SPDX-License-Identifier: GPL-2.0-only */
35 ventry elx_sync // Synchronous 64-bit EL1
36 ventry el1_irq_invalid // IRQ 64-bit EL1
37 ventry el1_fiq_invalid // FIQ 64-bit EL1
38 ventry el1_error_invalid // Error 64-bit EL1
40 ventry el1_sync_invalid // Synchronous 32-bit EL1
41 ventry el1_irq_invalid // IRQ 32-bit EL1
42 ventry el1_fiq_invalid // FIQ 32-bit EL1
43 ventry el1_error_invalid // Error 32-bit EL1
68 /* Someone called kvm_call_hyp() against the hyp-stub... */
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/linux/arch/powerpc/platforms/
H A DKconfig.cputype1 # SPDX-License-Identifier: GPL-2.0
7 bool "64-bit kernel"
10 This option selects whether a 32-bit or a 64-bit kernel
267 default "-mtune=power10" if $(cc-option,-mtune=power10)
268 default "-mtune=power9" if $(cc-option,-mtune=power9)
269 default "-mtune=power8" if $(cc-option,-mtune=power8)
346 This option enables kernel support for larger than 32-bit physical
351 is platform-dependent.
367 any affect on a non-altivec cpu (it does, however add code to the
383 VSX (P7 and above), but does not have any affect on a non-VSX
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/linux/arch/x86/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0
4 bool "64-bit kernel" if "$(ARCH)" = "x86"
7 Say yes to build a 64-bit kernel - formerly known as x86_64
8 Say no to build a 32-bit kernel - formerly known as i386
13 # Options that are inherently 32-bit kernel only:
26 # Options that are inherently 64-bit kernel only:
56 # ported to 32-bit as well. )
158 # Word-size accesses may read uninitialized data past the trailing \0
174 select GENERIC_IRQ_EFFECTIVE_AFF_MASK if SMP
176 select GENERIC_IRQ_MIGRATION if SMP
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/linux/arch/powerpc/include/asm/
H A Dmpic_msgr.h1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright 2011-2012, Meador Inge, Mentor Graphics Corporation.
11 #include <asm/smp.h>
69 * The given 32-bit message is written to the given message
75 out_be32(msgr->base, message); in mpic_msgr_write()
82 * Returns the 32-bit value currently in the given message register.
88 return in_be32(msgr->base); in mpic_msgr_read()
113 out_be32(msgr->base, 1 << get_hard_smp_processor_id(cpu_num)); in mpic_msgr_set_destination()
120 * 0 is returned if this message register is not capable of receiving
126 return msgr->irq; in mpic_msgr_get_irq()
/linux/arch/x86/kernel/
H A Dvsmp_64.c1 // SPDX-License-Identifier: GPL-2.0-only
15 #include <linux/smp.h>
19 #include <asm/pci-direct.h>
32 /* set vSMP magic bits to indicate vSMP capable kernel */ in set_vsmp_ctl()
58 static int is_vsmp = -1;
75 if (is_vsmp != -1) in is_vsmp_box()
121 maxcpus = (topology & ((1 << node_shift) - 1)) + 1; in vsmp_cap_cpus()
H A Dmsr.c1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* ----------------------------------------------------------------------- *
4 * Copyright 2000-2008 H. Peter Anvin - All Rights Reserved
7 * ----------------------------------------------------------------------- */
17 * an SMP box will direct the access to CPU %d.
29 #include <linux/smp.h>
63 return -EINVAL; /* Invalid chunk size */ in msr_read()
65 for (; count; count -= 8) { in msr_read()
70 err = -EFAULT; in msr_read()
86 * It's possible to be smarter here and do it (for example) per-MSR, but in filter_write()
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H A Dapm_32.c1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* -*- linux-c -*-
4 * Copyright 1994-2001 Stephen Rothwell (sfr@canb.auug.org.au)
16 * (Thanks to Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>)
43 * 1.1: support user-space standby and suspend, power off after system
46 * is only incorrect by 30-60mS (vs. 1S previously) (Gabor J. Toth
48 * screen-blanking and gpm (Stephen Rothwell); Linux 1.99.4
49 * 1.2a:Simple change to stop mysterious bug reports with SMP also added
50 * levels to the printk calls. APM is not defined for SMP machines.
63 * <echter@informatik.uni-rostock.de>
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/linux/arch/arm/mach-mstar/
H A Dmstarv7.c1 // SPDX-License-Identifier: GPL-2.0
17 * In the u-boot code the area these registers are in is
22 * for both u-boot and linux share calls to "flush the miu pipe".
24 * the state is right before DMA capable devices try to read
85 return -EINVAL; in mstarv7_boot_secondary()
91 return -ENODEV; in mstarv7_boot_secondary()
128 .smp = smp_ops(mstarv7_smp_ops),
/linux/arch/arm/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0
65 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
66 select GENERIC_IRQ_IPI if SMP
132 select MMU_GATHER_RCU_TABLE_FREE if SMP && ARM_LPAE
162 The ARM series is a line of low-power-consumption RISC chip designs
164 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
165 manufactured, but legacy ARM-based PC hardware remains popular in
173 relocations. The combined range is -/+ 256 MiB, which is usually
266 Patch phys-to-virt and virt-to-phys translation functions at
270 This can only be used with non-XIP MMU kernels where the base
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/linux/Documentation/core-api/
H A Dgenericirq.rst7 :Copyright: |copy| 2005-2010: Thomas Gleixner
8 :Copyright: |copy| 2005-2006: Ingo Molnar
29 __do_IRQ() super-handler, which is able to deal with every type of
36 - Level type
38 - Edge type
40 - Simple type
44 - Fast EOI type
46 In the SMP world of the __do_IRQ() super-handler another type was
49 - Per CPU type
51 This split implementation of high-level IRQ handlers allows us to
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/linux/arch/alpha/kernel/
H A Dsmp.c1 // SPDX-License-Identifier: GPL-2.0
3 * linux/arch/alpha/kernel/smp.c
5 * 2001-07-09 Phil Ezolt (Phillip.Ezolt@compaq.com)
22 #include <linux/smp.h>
54 /* A collection of per-processor data. */
78 * per-processor storage.
90 * Ideally sets up per-cpu profiling hooks. Doesn't do much now...
142 /* Call platform-specific callin, if specified */ in smp_callin()
148 current->active_mm = &init_mm; in smp_callin()
168 cpuid, current, current->active_mm)); in smp_callin()
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/linux/kernel/time/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0-only
28 # Architecture can handle broadcast in a driver-agnostic way
113 will only trigger on an as-needed basis when the system is idle.
122 depends on SMP
139 the expense of some overhead in user <-> kernel transitions:
163 The major pre-requirement for full dynticks to work is to
196 hardware is not capable then this option only increases
207 The default is based on a half-second clocksource watchdog
/linux/arch/powerpc/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0
5 def_bool PPC64 && $(cc-option, -mabi=elfv2)
8 def_bool PPC64 && $(cc-option, -mcpu=power10 -mprefixed)
11 # Clang has a bug (https://github.com/llvm/llvm-project/issues/62372)
12 # where pcrel code is not generated if -msoft-float, -mno-altivec, or
13 # -mno-vsx options are also given. Without these options, fp/vec
16 def_bool PPC64 && CC_IS_GCC && $(cc-option, -mcpu=power10 -mpcrel)
35 # On Book3S 64, the default virtual address space for 64-bit processes
38 # between bottom-up and top-down allocations for applications that
41 default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K)
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/linux/kernel/
H A Dsys.c1 // SPDX-License-Identifier: GPL-2.0
27 #include <linux/posix-timers.h>
84 # define SET_UNALIGN_CTL(a, b) (-EINVAL)
87 # define GET_UNALIGN_CTL(a, b) (-EINVAL)
90 # define SET_FPEMU_CTL(a, b) (-EINVAL)
93 # define GET_FPEMU_CTL(a, b) (-EINVAL)
96 # define SET_FPEXC_CTL(a, b) (-EINVAL)
99 # define GET_FPEXC_CTL(a, b) (-EINVAL)
102 # define GET_ENDIAN(a, b) (-EINVAL)
105 # define SET_ENDIAN(a, b) (-EINVAL)
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/linux/arch/arm/kernel/
H A Dsmp.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * linux/arch/arm/kernel/smp.c
33 #include <asm/smp.h>
75 * SGI8-15 can be reserved by secure firmware, and thus may
113 return cpu_vtable[cpu] ? 0 : -ENOMEM; in secondary_biglittle_prepare()
118 init_proc_vtable(lookup_processor(read_cpuid_id())->proc); in secondary_biglittle_init()
136 return -ENOSYS; in __cpu_up()
172 ret = -EIO; in __cpu_up()
183 /* platform specific SMP operations */
273 * OK - migrate IRQs away from this CPU in __cpu_disable()
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/linux/arch/xtensa/kernel/
H A Dsmp.c2 * Xtensa SMP support functions.
8 * Copyright (C) 2008 - 2013 Tensilica Inc.
30 #include <linux/smp.h>
44 # error "The S32C1I option is required for SMP."
117 static int boot_secondary_processors = 1; /* Set with xt-gdb via .xt-gdb */
146 current->active_mm = mm; in secondary_start_kernel()
174 pr_debug("%s: cpu: %d, run_stall_mask: %lx ---> %lx\n", in mx_cpu_start()
184 pr_debug("%s: cpu: %d, run_stall_mask: %lx ---> %lx\n", in mx_cpu_stop()
228 return -EIO; in boot_secondary()
253 ret = -EIO; in __cpu_up()
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/linux/mm/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0-only
30 compress them into a dynamically allocated RAM-based memory pool.
145 int "Maximum number of physical pages per-zspage"
226 specifically-sized allocations with user-controlled contents
230 user-controlled allocations. This may very slightly increase
232 of extra pages since the bulk of user-controlled allocations
233 are relatively long-lived.
248 Try running: slabinfo -DA
252 depends on SMP && !SLUB_TINY
285 utilization of a direct-mapped memory-side-cache. See section
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/linux/Documentation/usb/
H A Dusb-serial.rst45 --------------------------------------
58 -----------------------------------------------
72 This goes against the current documentation for pilot-xfer and other
77 (this is usually /dev/ttyUSB1 if you do not have any other usb-serial
99 Kroah-Hartman at greg@kroah.com
103 -------------------
115 significant advantage of using USB is speed - I can get 73 to 113
120 contains the necessary packages and a simple step-by-step howto.
127 on Win98. Omit the proxy server part; Linux is quite capable of forwarding
129 iPAQ - disable autosync by going to the Start/Settings/Connections menu
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