1 | /* $Id: mp-r0drv-linux.c 37672 2011-06-28 19:48:17Z vboxsync $ */
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2 | /** @file
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3 | * IPRT - Multiprocessor, Ring-0 Driver, Linux.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2008 Oracle Corporation
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8 | *
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9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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10 | * available from http://www.virtualbox.org. This file is free software;
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11 | * you can redistribute it and/or modify it under the terms of the GNU
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12 | * General Public License (GPL) as published by the Free Software
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13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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16 | *
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17 | * The contents of this file may alternatively be used under the terms
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18 | * of the Common Development and Distribution License Version 1.0
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19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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20 | * VirtualBox OSE distribution, in which case the provisions of the
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21 | * CDDL are applicable instead of those of the GPL.
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22 | *
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23 | * You may elect to license modified versions of this file under the
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24 | * terms and conditions of either the GPL or the CDDL or both.
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25 | */
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26 |
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27 |
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28 | /*******************************************************************************
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29 | * Header Files *
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30 | *******************************************************************************/
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31 | #include "the-linux-kernel.h"
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32 | #include "internal/iprt.h"
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33 |
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34 | #include <iprt/mp.h>
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35 | #include <iprt/cpuset.h>
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36 | #include <iprt/err.h>
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37 | #include <iprt/asm.h>
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38 | #include <iprt/thread.h>
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39 | #include "r0drv/mp-r0drv.h"
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40 |
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41 |
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42 | RTDECL(RTCPUID) RTMpCpuId(void)
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43 | {
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44 | return smp_processor_id();
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45 | }
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46 | RT_EXPORT_SYMBOL(RTMpCpuId);
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47 |
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48 |
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49 | RTDECL(int) RTMpCpuIdToSetIndex(RTCPUID idCpu)
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50 | {
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51 | return idCpu < RTCPUSET_MAX_CPUS && idCpu < NR_CPUS ? (int)idCpu : -1;
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52 | }
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53 | RT_EXPORT_SYMBOL(RTMpCpuIdToSetIndex);
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54 |
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55 |
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56 | RTDECL(RTCPUID) RTMpCpuIdFromSetIndex(int iCpu)
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57 | {
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58 | return iCpu < NR_CPUS ? (RTCPUID)iCpu : NIL_RTCPUID;
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59 | }
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60 | RT_EXPORT_SYMBOL(RTMpCpuIdFromSetIndex);
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61 |
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62 |
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63 | RTDECL(RTCPUID) RTMpGetMaxCpuId(void)
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64 | {
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65 | return NR_CPUS - 1; //???
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66 | }
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67 | RT_EXPORT_SYMBOL(RTMpGetMaxCpuId);
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68 |
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69 |
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70 | RTDECL(bool) RTMpIsCpuPossible(RTCPUID idCpu)
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71 | {
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72 | #if defined(CONFIG_SMP)
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73 | if (RT_UNLIKELY(idCpu >= NR_CPUS))
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74 | return false;
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75 |
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76 | # if defined(cpu_possible)
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77 | return cpu_possible(idCpu);
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78 | # else /* < 2.5.29 */
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79 | return idCpu < (RTCPUID)smp_num_cpus;
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80 | # endif
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81 | #else
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82 | return idCpu == RTMpCpuId();
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83 | #endif
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84 | }
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85 | RT_EXPORT_SYMBOL(RTMpIsCpuPossible);
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86 |
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87 |
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88 | RTDECL(PRTCPUSET) RTMpGetSet(PRTCPUSET pSet)
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89 | {
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90 | RTCPUID idCpu;
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91 |
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92 | RTCpuSetEmpty(pSet);
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93 | idCpu = RTMpGetMaxCpuId();
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94 | do
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95 | {
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96 | if (RTMpIsCpuPossible(idCpu))
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97 | RTCpuSetAdd(pSet, idCpu);
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98 | } while (idCpu-- > 0);
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99 | return pSet;
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100 | }
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101 | RT_EXPORT_SYMBOL(RTMpGetSet);
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102 |
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103 |
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104 | RTDECL(RTCPUID) RTMpGetCount(void)
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105 | {
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106 | #ifdef CONFIG_SMP
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107 | # if defined(CONFIG_HOTPLUG_CPU) /* introduced & uses cpu_present */
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108 | return num_present_cpus();
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109 | # elif defined(num_possible_cpus)
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110 | return num_possible_cpus();
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111 | # elif LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0)
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112 | return smp_num_cpus;
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113 | # else
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114 | RTCPUSET Set;
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115 | RTMpGetSet(&Set);
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116 | return RTCpuSetCount(&Set);
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117 | # endif
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118 | #else
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119 | return 1;
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120 | #endif
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121 | }
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122 | RT_EXPORT_SYMBOL(RTMpGetCount);
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123 |
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124 |
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125 | RTDECL(bool) RTMpIsCpuOnline(RTCPUID idCpu)
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126 | {
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127 | #ifdef CONFIG_SMP
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128 | if (RT_UNLIKELY(idCpu >= NR_CPUS))
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129 | return false;
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130 | # ifdef cpu_online
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131 | return cpu_online(idCpu);
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132 | # else /* 2.4: */
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133 | return cpu_online_map & RT_BIT_64(idCpu);
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134 | # endif
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135 | #else
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136 | return idCpu == RTMpCpuId();
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137 | #endif
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138 | }
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139 | RT_EXPORT_SYMBOL(RTMpIsCpuOnline);
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140 |
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141 |
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142 | RTDECL(PRTCPUSET) RTMpGetOnlineSet(PRTCPUSET pSet)
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143 | {
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144 | #ifdef CONFIG_SMP
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145 | RTCPUID idCpu;
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146 |
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147 | RTCpuSetEmpty(pSet);
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148 | idCpu = RTMpGetMaxCpuId();
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149 | do
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150 | {
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151 | if (RTMpIsCpuOnline(idCpu))
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152 | RTCpuSetAdd(pSet, idCpu);
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153 | } while (idCpu-- > 0);
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154 | #else
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155 | RTCpuSetEmpty(pSet);
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156 | RTCpuSetAdd(pSet, RTMpCpuId());
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157 | #endif
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158 | return pSet;
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159 | }
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160 | RT_EXPORT_SYMBOL(RTMpGetOnlineSet);
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161 |
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162 |
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163 | RTDECL(RTCPUID) RTMpGetOnlineCount(void)
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164 | {
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165 | #ifdef CONFIG_SMP
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166 | # if defined(num_online_cpus)
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167 | return num_online_cpus();
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168 | # else
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169 | RTCPUSET Set;
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170 | RTMpGetOnlineSet(&Set);
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171 | return RTCpuSetCount(&Set);
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172 | # endif
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173 | #else
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174 | return 1;
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175 | #endif
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176 | }
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177 | RT_EXPORT_SYMBOL(RTMpGetOnlineCount);
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178 |
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179 |
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180 | RTDECL(bool) RTMpIsCpuWorkPending(void)
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181 | {
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182 | /** @todo (not used on non-Windows platforms yet). */
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183 | return false;
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184 | }
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185 | RT_EXPORT_SYMBOL(RTMpIsCpuWorkPending);
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186 |
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187 |
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188 | /**
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189 | * Wrapper between the native linux per-cpu callbacks and PFNRTWORKER
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190 | *
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191 | * @param pvInfo Pointer to the RTMPARGS package.
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192 | */
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193 | static void rtmpLinuxWrapper(void *pvInfo)
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194 | {
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195 | PRTMPARGS pArgs = (PRTMPARGS)pvInfo;
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196 | ASMAtomicIncU32(&pArgs->cHits);
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197 | pArgs->pfnWorker(RTMpCpuId(), pArgs->pvUser1, pArgs->pvUser2);
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198 | }
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199 |
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200 |
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201 | RTDECL(int) RTMpOnAll(PFNRTMPWORKER pfnWorker, void *pvUser1, void *pvUser2)
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202 | {
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203 | int rc;
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204 | RTMPARGS Args;
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205 |
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206 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 0)
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207 | RTTHREADPREEMPTSTATE PreemptState = RTTHREADPREEMPTSTATE_INITIALIZER;
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208 | #endif
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209 | Args.pfnWorker = pfnWorker;
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210 | Args.pvUser1 = pvUser1;
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211 | Args.pvUser2 = pvUser2;
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212 | Args.idCpu = NIL_RTCPUID;
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213 | Args.cHits = 0;
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214 |
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215 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 27)
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216 | rc = on_each_cpu(rtmpLinuxWrapper, &Args, 1 /* wait */);
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217 | #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0)
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218 | rc = on_each_cpu(rtmpLinuxWrapper, &Args, 0 /* retry */, 1 /* wait */);
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219 | #else /* older kernels */
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220 | RTThreadPreemptDisable(&PreemptState);
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221 | rc = smp_call_function(rtmpLinuxWrapper, &Args, 0 /* retry */, 1 /* wait */);
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222 | local_irq_disable();
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223 | rtmpLinuxWrapper(&Args);
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224 | local_irq_enable();
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225 | RTThreadPreemptRestore(&PreemptState);
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226 | #endif /* older kernels */
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227 | Assert(rc == 0); NOREF(rc);
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228 | return VINF_SUCCESS;
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229 | }
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230 | RT_EXPORT_SYMBOL(RTMpOnAll);
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231 |
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232 |
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233 | RTDECL(int) RTMpOnOthers(PFNRTMPWORKER pfnWorker, void *pvUser1, void *pvUser2)
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234 | {
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235 | int rc;
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236 | RTMPARGS Args;
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237 |
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238 | RTTHREADPREEMPTSTATE PreemptState = RTTHREADPREEMPTSTATE_INITIALIZER;
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239 | Args.pfnWorker = pfnWorker;
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240 | Args.pvUser1 = pvUser1;
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241 | Args.pvUser2 = pvUser2;
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242 | Args.idCpu = NIL_RTCPUID;
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243 | Args.cHits = 0;
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244 |
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245 | RTThreadPreemptDisable(&PreemptState);
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246 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 27)
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247 | rc = smp_call_function(rtmpLinuxWrapper, &Args, 1 /* wait */);
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248 | #else /* older kernels */
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249 | rc = smp_call_function(rtmpLinuxWrapper, &Args, 0 /* retry */, 1 /* wait */);
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250 | #endif /* older kernels */
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251 | RTThreadPreemptRestore(&PreemptState);
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252 |
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253 | Assert(rc == 0); NOREF(rc);
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254 | return VINF_SUCCESS;
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255 | }
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256 | RT_EXPORT_SYMBOL(RTMpOnOthers);
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257 |
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258 |
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259 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19)
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260 | /**
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261 | * Wrapper between the native linux per-cpu callbacks and PFNRTWORKER
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262 | * employed by RTMpOnSpecific on older kernels that lacks smp_call_function_single.
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263 | *
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264 | * @param pvInfo Pointer to the RTMPARGS package.
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265 | */
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266 | static void rtmpOnSpecificLinuxWrapper(void *pvInfo)
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267 | {
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268 | PRTMPARGS pArgs = (PRTMPARGS)pvInfo;
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269 | RTCPUID idCpu = RTMpCpuId();
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270 |
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271 | if (idCpu == pArgs->idCpu)
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272 | {
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273 | pArgs->pfnWorker(idCpu, pArgs->pvUser1, pArgs->pvUser2);
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274 | ASMAtomicIncU32(&pArgs->cHits);
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275 | }
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276 | }
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277 | #endif
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278 |
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279 |
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280 | RTDECL(int) RTMpOnSpecific(RTCPUID idCpu, PFNRTMPWORKER pfnWorker, void *pvUser1, void *pvUser2)
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281 | {
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282 | int rc;
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283 | RTMPARGS Args;
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284 |
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285 | RTTHREADPREEMPTSTATE PreemptState = RTTHREADPREEMPTSTATE_INITIALIZER;
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286 | Args.pfnWorker = pfnWorker;
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287 | Args.pvUser1 = pvUser1;
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288 | Args.pvUser2 = pvUser2;
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289 | Args.idCpu = idCpu;
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290 | Args.cHits = 0;
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291 |
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292 | if (!RTMpIsCpuPossible(idCpu))
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293 | return VERR_CPU_NOT_FOUND;
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294 |
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295 | RTThreadPreemptDisable(&PreemptState);
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296 | if (idCpu != RTMpCpuId())
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297 | {
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298 | if (RTMpIsCpuOnline(idCpu))
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299 | {
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300 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 27)
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301 | rc = smp_call_function_single(idCpu, rtmpLinuxWrapper, &Args, 1 /* wait */);
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302 | #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 19)
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303 | rc = smp_call_function_single(idCpu, rtmpLinuxWrapper, &Args, 0 /* retry */, 1 /* wait */);
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304 | #else /* older kernels */
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305 | rc = smp_call_function(rtmpOnSpecificLinuxWrapper, &Args, 0 /* retry */, 1 /* wait */);
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306 | #endif /* older kernels */
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307 | Assert(rc == 0);
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308 | rc = Args.cHits ? VINF_SUCCESS : VERR_CPU_OFFLINE;
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309 | }
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310 | else
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311 | rc = VERR_CPU_OFFLINE;
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312 | }
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313 | else
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314 | {
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315 | rtmpLinuxWrapper(&Args);
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316 | rc = VINF_SUCCESS;
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317 | }
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318 | RTThreadPreemptRestore(&PreemptState);;
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319 |
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320 | NOREF(rc);
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321 | return rc;
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322 | }
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323 | RT_EXPORT_SYMBOL(RTMpOnSpecific);
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324 |
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325 |
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326 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 19)
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327 | /**
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328 | * Dummy callback used by RTMpPokeCpu.
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329 | *
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330 | * @param pvInfo Ignored.
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331 | */
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332 | static void rtmpLinuxPokeCpuCallback(void *pvInfo)
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333 | {
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334 | NOREF(pvInfo);
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335 | }
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336 | #endif
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337 |
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338 |
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339 | RTDECL(int) RTMpPokeCpu(RTCPUID idCpu)
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340 | {
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341 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 19)
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342 | int rc;
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343 |
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344 | if (!RTMpIsCpuPossible(idCpu))
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345 | return VERR_CPU_NOT_FOUND;
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346 | if (!RTMpIsCpuOnline(idCpu))
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347 | return VERR_CPU_OFFLINE;
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348 |
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349 | # if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 27)
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350 | rc = smp_call_function_single(idCpu, rtmpLinuxPokeCpuCallback, NULL, 0 /* wait */);
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351 | # elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 19)
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352 | rc = smp_call_function_single(idCpu, rtmpLinuxPokeCpuCallback, NULL, 0 /* retry */, 0 /* wait */);
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353 | # else /* older kernels */
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354 | # error oops
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355 | # endif /* older kernels */
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356 | NOREF(rc);
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357 | Assert(rc == 0);
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358 | return VINF_SUCCESS;
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359 |
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360 | #else /* older kernels */
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361 | /* no unicast here? */
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362 | return VERR_NOT_SUPPORTED;
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363 | #endif /* older kernels */
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364 | }
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365 | RT_EXPORT_SYMBOL(RTMpPokeCpu);
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366 |
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