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Diffstat (limited to 'src/VBox/Runtime/r0drv/linux/mp-r0drv-linux.c')
-rw-r--r--src/VBox/Runtime/r0drv/linux/mp-r0drv-linux.c640
1 files changed, 640 insertions, 0 deletions
diff --git a/src/VBox/Runtime/r0drv/linux/mp-r0drv-linux.c b/src/VBox/Runtime/r0drv/linux/mp-r0drv-linux.c
new file mode 100644
index 00000000..1679e228
--- /dev/null
+++ b/src/VBox/Runtime/r0drv/linux/mp-r0drv-linux.c
@@ -0,0 +1,640 @@
+/* $Id: mp-r0drv-linux.c $ */
+/** @file
+ * IPRT - Multiprocessor, Ring-0 Driver, Linux.
+ */
+
+/*
+ * Copyright (C) 2008-2022 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+
+/*********************************************************************************************************************************
+* Header Files *
+*********************************************************************************************************************************/
+#include "the-linux-kernel.h"
+#include "internal/iprt.h"
+
+#include <iprt/mp.h>
+#include <iprt/cpuset.h>
+#include <iprt/err.h>
+#include <iprt/asm.h>
+#include <iprt/thread.h>
+#include "r0drv/mp-r0drv.h"
+
+
+/*********************************************************************************************************************************
+* Defined Constants And Macros *
+*********************************************************************************************************************************/
+#if defined(nr_cpumask_bits) || RTLNX_VER_MIN(2,6,28)
+# define VBOX_NR_CPUMASK_BITS (nr_cpumask_bits) /* same as nr_cpu_ids */
+#else
+# define VBOX_NR_CPUMASK_BITS (NR_CPUS)
+#endif
+
+
+RTDECL(RTCPUID) RTMpCpuId(void)
+{
+ return smp_processor_id();
+}
+RT_EXPORT_SYMBOL(RTMpCpuId);
+
+
+RTDECL(int) RTMpCurSetIndex(void)
+{
+ return smp_processor_id();
+}
+RT_EXPORT_SYMBOL(RTMpCurSetIndex);
+
+
+RTDECL(int) RTMpCurSetIndexAndId(PRTCPUID pidCpu)
+{
+ return *pidCpu = smp_processor_id();
+}
+RT_EXPORT_SYMBOL(RTMpCurSetIndexAndId);
+
+
+RTDECL(int) RTMpCpuIdToSetIndex(RTCPUID idCpu)
+{
+ return idCpu < RTCPUSET_MAX_CPUS && idCpu < VBOX_NR_CPUMASK_BITS ? (int)idCpu : -1;
+}
+RT_EXPORT_SYMBOL(RTMpCpuIdToSetIndex);
+
+
+RTDECL(RTCPUID) RTMpCpuIdFromSetIndex(int iCpu)
+{
+ return (unsigned)iCpu < VBOX_NR_CPUMASK_BITS ? (RTCPUID)iCpu : NIL_RTCPUID;
+}
+RT_EXPORT_SYMBOL(RTMpCpuIdFromSetIndex);
+
+
+RTDECL(RTCPUID) RTMpGetMaxCpuId(void)
+{
+ return VBOX_NR_CPUMASK_BITS - 1;
+}
+RT_EXPORT_SYMBOL(RTMpGetMaxCpuId);
+
+
+RTDECL(bool) RTMpIsCpuPossible(RTCPUID idCpu)
+{
+#if defined(CONFIG_SMP)
+# if RTLNX_VER_MIN(2,6,2) || defined(cpu_possible)
+ return idCpu < VBOX_NR_CPUMASK_BITS && cpu_possible(idCpu);
+# else /* < 2.5.29 */
+ return idCpu < (RTCPUID)(smp_num_cpus);
+# endif
+#else
+ return idCpu == RTMpCpuId();
+#endif
+}
+RT_EXPORT_SYMBOL(RTMpIsCpuPossible);
+
+
+RTDECL(PRTCPUSET) RTMpGetSet(PRTCPUSET pSet)
+{
+ RTCPUID idCpu;
+
+ RTCpuSetEmpty(pSet);
+ idCpu = RTMpGetMaxCpuId();
+ do
+ {
+ if (RTMpIsCpuPossible(idCpu))
+ RTCpuSetAdd(pSet, idCpu);
+ } while (idCpu-- > 0);
+ return pSet;
+}
+RT_EXPORT_SYMBOL(RTMpGetSet);
+
+
+RTDECL(RTCPUID) RTMpGetCount(void)
+{
+#ifdef CONFIG_SMP
+# if RTLNX_VER_MIN(2,6,4) || defined(num_possible_cpus)
+ return num_possible_cpus();
+# elif RTLNX_VER_MAX(2,5,0)
+ return smp_num_cpus;
+# else
+ RTCPUSET Set;
+ RTMpGetSet(&Set);
+ return RTCpuSetCount(&Set);
+# endif
+#else
+ return 1;
+#endif
+}
+RT_EXPORT_SYMBOL(RTMpGetCount);
+
+
+RTDECL(bool) RTMpIsCpuOnline(RTCPUID idCpu)
+{
+#ifdef CONFIG_SMP
+# if RTLNX_VER_MIN(2,6,0) || defined(cpu_online)
+ return idCpu < VBOX_NR_CPUMASK_BITS && cpu_online(idCpu);
+# else /* 2.4: */
+ return idCpu < VBOX_NR_CPUMASK_BITS && cpu_online_map & RT_BIT_64(idCpu);
+# endif
+#else
+ return idCpu == RTMpCpuId();
+#endif
+}
+RT_EXPORT_SYMBOL(RTMpIsCpuOnline);
+
+
+RTDECL(PRTCPUSET) RTMpGetOnlineSet(PRTCPUSET pSet)
+{
+#ifdef CONFIG_SMP
+ RTCPUID idCpu;
+
+ RTCpuSetEmpty(pSet);
+ idCpu = RTMpGetMaxCpuId();
+ do
+ {
+ if (RTMpIsCpuOnline(idCpu))
+ RTCpuSetAdd(pSet, idCpu);
+ } while (idCpu-- > 0);
+#else
+ RTCpuSetEmpty(pSet);
+ RTCpuSetAdd(pSet, RTMpCpuId());
+#endif
+ return pSet;
+}
+RT_EXPORT_SYMBOL(RTMpGetOnlineSet);
+
+
+RTDECL(RTCPUID) RTMpGetOnlineCount(void)
+{
+#ifdef CONFIG_SMP
+# if RTLNX_VER_MIN(2,6,0) || defined(num_online_cpus)
+ return num_online_cpus();
+# else
+ RTCPUSET Set;
+ RTMpGetOnlineSet(&Set);
+ return RTCpuSetCount(&Set);
+# endif
+#else
+ return 1;
+#endif
+}
+RT_EXPORT_SYMBOL(RTMpGetOnlineCount);
+
+
+RTDECL(bool) RTMpIsCpuWorkPending(void)
+{
+ /** @todo (not used on non-Windows platforms yet). */
+ return false;
+}
+RT_EXPORT_SYMBOL(RTMpIsCpuWorkPending);
+
+
+/**
+ * Wrapper between the native linux per-cpu callbacks and PFNRTWORKER.
+ *
+ * @param pvInfo Pointer to the RTMPARGS package.
+ */
+static void rtmpLinuxWrapper(void *pvInfo)
+{
+ PRTMPARGS pArgs = (PRTMPARGS)pvInfo;
+ ASMAtomicIncU32(&pArgs->cHits);
+ pArgs->pfnWorker(RTMpCpuId(), pArgs->pvUser1, pArgs->pvUser2);
+}
+
+#ifdef CONFIG_SMP
+
+# if RTLNX_VER_MIN(2,6,27)
+/**
+ * Wrapper between the native linux per-cpu callbacks and PFNRTWORKER, does hit
+ * increment after calling the worker.
+ *
+ * @param pvInfo Pointer to the RTMPARGS package.
+ */
+static void rtmpLinuxWrapperPostInc(void *pvInfo)
+{
+ PRTMPARGS pArgs = (PRTMPARGS)pvInfo;
+ pArgs->pfnWorker(RTMpCpuId(), pArgs->pvUser1, pArgs->pvUser2);
+ ASMAtomicIncU32(&pArgs->cHits);
+}
+# endif
+
+
+/**
+ * Wrapper between the native linux all-cpu callbacks and PFNRTWORKER.
+ *
+ * @param pvInfo Pointer to the RTMPARGS package.
+ */
+static void rtmpLinuxAllWrapper(void *pvInfo)
+{
+ PRTMPARGS pArgs = (PRTMPARGS)pvInfo;
+ PRTCPUSET pWorkerSet = pArgs->pWorkerSet;
+ RTCPUID idCpu = RTMpCpuId();
+ Assert(!RTThreadPreemptIsEnabled(NIL_RTTHREAD));
+
+ if (RTCpuSetIsMember(pWorkerSet, idCpu))
+ {
+ pArgs->pfnWorker(idCpu, pArgs->pvUser1, pArgs->pvUser2);
+ RTCpuSetDel(pWorkerSet, idCpu);
+ }
+}
+
+#endif /* CONFIG_SMP */
+
+RTDECL(int) RTMpOnAll(PFNRTMPWORKER pfnWorker, void *pvUser1, void *pvUser2)
+{
+ IPRT_LINUX_SAVE_EFL_AC();
+ RTMPARGS Args;
+ RTCPUSET OnlineSet;
+ RTCPUID idCpu;
+#ifdef CONFIG_SMP
+ uint32_t cLoops;
+#endif
+
+ RTTHREADPREEMPTSTATE PreemptState = RTTHREADPREEMPTSTATE_INITIALIZER;
+
+ Args.pfnWorker = pfnWorker;
+ Args.pvUser1 = pvUser1;
+ Args.pvUser2 = pvUser2;
+ Args.idCpu = NIL_RTCPUID;
+ Args.cHits = 0;
+
+ RTThreadPreemptDisable(&PreemptState);
+ RTMpGetOnlineSet(&OnlineSet);
+ Args.pWorkerSet = &OnlineSet;
+ idCpu = RTMpCpuId();
+
+#ifdef CONFIG_SMP
+ if (RTCpuSetCount(&OnlineSet) > 1)
+ {
+ /* Fire the function on all other CPUs without waiting for completion. */
+# if RTLNX_VER_MIN(5,3,0)
+ smp_call_function(rtmpLinuxAllWrapper, &Args, 0 /* wait */);
+# elif RTLNX_VER_MIN(2,6,27)
+ int rc = smp_call_function(rtmpLinuxAllWrapper, &Args, 0 /* wait */);
+ Assert(!rc); NOREF(rc);
+# else
+ int rc = smp_call_function(rtmpLinuxAllWrapper, &Args, 0 /* retry */, 0 /* wait */);
+ Assert(!rc); NOREF(rc);
+# endif
+ }
+#endif
+
+ /* Fire the function on this CPU. */
+ Args.pfnWorker(idCpu, Args.pvUser1, Args.pvUser2);
+ RTCpuSetDel(Args.pWorkerSet, idCpu);
+
+#ifdef CONFIG_SMP
+ /* Wait for all of them finish. */
+ cLoops = 64000;
+ while (!RTCpuSetIsEmpty(Args.pWorkerSet))
+ {
+ /* Periodically check if any CPU in the wait set has gone offline, if so update the wait set. */
+ if (!cLoops--)
+ {
+ RTCPUSET OnlineSetNow;
+ RTMpGetOnlineSet(&OnlineSetNow);
+ RTCpuSetAnd(Args.pWorkerSet, &OnlineSetNow);
+
+ cLoops = 64000;
+ }
+
+ ASMNopPause();
+ }
+#endif
+
+ RTThreadPreemptRestore(&PreemptState);
+ IPRT_LINUX_RESTORE_EFL_AC();
+ return VINF_SUCCESS;
+}
+RT_EXPORT_SYMBOL(RTMpOnAll);
+
+
+RTDECL(int) RTMpOnOthers(PFNRTMPWORKER pfnWorker, void *pvUser1, void *pvUser2)
+{
+#ifdef CONFIG_SMP
+ IPRT_LINUX_SAVE_EFL_AC();
+ RTMPARGS Args;
+
+ RTTHREADPREEMPTSTATE PreemptState = RTTHREADPREEMPTSTATE_INITIALIZER;
+ Args.pfnWorker = pfnWorker;
+ Args.pvUser1 = pvUser1;
+ Args.pvUser2 = pvUser2;
+ Args.idCpu = NIL_RTCPUID;
+ Args.cHits = 0;
+
+ RTThreadPreemptDisable(&PreemptState);
+# if RTLNX_VER_MIN(5,3,0)
+ smp_call_function(rtmpLinuxWrapper, &Args, 1 /* wait */);
+# elif RTLNX_VER_MIN(2,6,27)
+ int rc = smp_call_function(rtmpLinuxWrapper, &Args, 1 /* wait */);
+ Assert(rc == 0); NOREF(rc);
+# else /* older kernels */
+ int rc = smp_call_function(rtmpLinuxWrapper, &Args, 0 /* retry */, 1 /* wait */);
+ Assert(rc == 0); NOREF(rc);
+# endif /* older kernels */
+ RTThreadPreemptRestore(&PreemptState);
+
+ IPRT_LINUX_RESTORE_EFL_AC();
+#else
+ RT_NOREF(pfnWorker, pvUser1, pvUser2);
+#endif
+ return VINF_SUCCESS;
+}
+RT_EXPORT_SYMBOL(RTMpOnOthers);
+
+
+#if RTLNX_VER_MAX(2,6,27) && defined(CONFIG_SMP)
+/**
+ * Wrapper between the native linux per-cpu callbacks and PFNRTWORKER
+ * employed by RTMpOnPair on older kernels that lacks smp_call_function_many.
+ *
+ * @param pvInfo Pointer to the RTMPARGS package.
+ */
+static void rtMpLinuxOnPairWrapper(void *pvInfo)
+{
+ PRTMPARGS pArgs = (PRTMPARGS)pvInfo;
+ RTCPUID idCpu = RTMpCpuId();
+
+ if ( idCpu == pArgs->idCpu
+ || idCpu == pArgs->idCpu2)
+ {
+ pArgs->pfnWorker(idCpu, pArgs->pvUser1, pArgs->pvUser2);
+ ASMAtomicIncU32(&pArgs->cHits);
+ }
+}
+#endif
+
+
+RTDECL(int) RTMpOnPair(RTCPUID idCpu1, RTCPUID idCpu2, uint32_t fFlags, PFNRTMPWORKER pfnWorker, void *pvUser1, void *pvUser2)
+{
+#ifdef CONFIG_SMP
+ IPRT_LINUX_SAVE_EFL_AC();
+ int rc;
+ RTTHREADPREEMPTSTATE PreemptState = RTTHREADPREEMPTSTATE_INITIALIZER;
+# if RTLNX_VER_MIN(2,6,28) /* 2.6.28 introduces CONFIG_CPUMASK_OFFSTACK */
+ cpumask_var_t DstCpuMask;
+# elif RTLNX_VER_MIN(2,6,27)
+ cpumask_t DstCpuMask;
+# endif
+
+ AssertReturn(idCpu1 != idCpu2, VERR_INVALID_PARAMETER);
+ AssertReturn(!(fFlags & RTMPON_F_VALID_MASK), VERR_INVALID_FLAGS);
+
+ /*
+ * Prepare the CPU mask before we disable preemption.
+ */
+# if RTLNX_VER_MIN(2,6,30)
+ if (!zalloc_cpumask_var(&DstCpuMask, GFP_KERNEL))
+ return VERR_NO_MEMORY;
+ cpumask_set_cpu(idCpu1, DstCpuMask);
+ cpumask_set_cpu(idCpu2, DstCpuMask);
+# elif RTLNX_VER_MIN(2,6,28)
+ if (!alloc_cpumask_var(&DstCpuMask, GFP_KERNEL))
+ return VERR_NO_MEMORY;
+ cpumask_clear(DstCpuMask);
+ cpumask_set_cpu(idCpu1, DstCpuMask);
+ cpumask_set_cpu(idCpu2, DstCpuMask);
+# elif RTLNX_VER_MIN(2,6,27)
+ cpus_clear(DstCpuMask);
+ cpu_set(idCpu1, DstCpuMask);
+ cpu_set(idCpu2, DstCpuMask);
+# endif
+
+ /*
+ * Check that both CPUs are online before doing the broadcast call.
+ */
+ RTThreadPreemptDisable(&PreemptState);
+ if ( RTMpIsCpuOnline(idCpu1)
+ && RTMpIsCpuOnline(idCpu2))
+ {
+ /*
+ * Use the smp_call_function variant taking a cpu mask where available,
+ * falling back on broadcast with filter. Slight snag if one of the
+ * CPUs is the one we're running on, we must do the call and the post
+ * call wait ourselves.
+ */
+ RTCPUID idCpuSelf = RTMpCpuId();
+ bool const fCallSelf = idCpuSelf == idCpu1 || idCpuSelf == idCpu2;
+ RTMPARGS Args;
+ Args.pfnWorker = pfnWorker;
+ Args.pvUser1 = pvUser1;
+ Args.pvUser2 = pvUser2;
+ Args.idCpu = idCpu1;
+ Args.idCpu2 = idCpu2;
+ Args.cHits = 0;
+
+# if RTLNX_VER_MIN(2,6,28)
+ smp_call_function_many(DstCpuMask, rtmpLinuxWrapperPostInc, &Args, !fCallSelf /* wait */);
+ rc = 0;
+# elif RTLNX_VER_MIN(2,6,27)
+ rc = smp_call_function_mask(DstCpuMask, rtmpLinuxWrapperPostInc, &Args, !fCallSelf /* wait */);
+# else /* older kernels */
+ rc = smp_call_function(rtMpLinuxOnPairWrapper, &Args, 0 /* retry */, !fCallSelf /* wait */);
+# endif /* older kernels */
+ Assert(rc == 0);
+
+ /* Call ourselves if necessary and wait for the other party to be done. */
+ if (fCallSelf)
+ {
+ uint32_t cLoops = 0;
+ rtmpLinuxWrapper(&Args);
+ while (ASMAtomicReadU32(&Args.cHits) < 2)
+ {
+ if ((cLoops & 0x1ff) == 0 && !RTMpIsCpuOnline(idCpuSelf == idCpu1 ? idCpu2 : idCpu1))
+ break;
+ cLoops++;
+ ASMNopPause();
+ }
+ }
+
+ Assert(Args.cHits <= 2);
+ if (Args.cHits == 2)
+ rc = VINF_SUCCESS;
+ else if (Args.cHits == 1)
+ rc = VERR_NOT_ALL_CPUS_SHOWED;
+ else if (Args.cHits == 0)
+ rc = VERR_CPU_OFFLINE;
+ else
+ rc = VERR_CPU_IPE_1;
+ }
+ /*
+ * A CPU must be present to be considered just offline.
+ */
+ else if ( RTMpIsCpuPresent(idCpu1)
+ && RTMpIsCpuPresent(idCpu2))
+ rc = VERR_CPU_OFFLINE;
+ else
+ rc = VERR_CPU_NOT_FOUND;
+
+ RTThreadPreemptRestore(&PreemptState);;
+# if RTLNX_VER_MIN(2,6,28)
+ free_cpumask_var(DstCpuMask);
+# endif
+ IPRT_LINUX_RESTORE_EFL_AC();
+ return rc;
+
+#else /* !CONFIG_SMP */
+ RT_NOREF(idCpu1, idCpu2, fFlags, pfnWorker, pvUser1, pvUser2);
+ return VERR_CPU_NOT_FOUND;
+#endif /* !CONFIG_SMP */
+}
+RT_EXPORT_SYMBOL(RTMpOnPair);
+
+
+RTDECL(bool) RTMpOnPairIsConcurrentExecSupported(void)
+{
+ return true;
+}
+RT_EXPORT_SYMBOL(RTMpOnPairIsConcurrentExecSupported);
+
+
+#if RTLNX_VER_MAX(2,6,19) && defined(CONFIG_SMP)
+/**
+ * Wrapper between the native linux per-cpu callbacks and PFNRTWORKER
+ * employed by RTMpOnSpecific on older kernels that lacks smp_call_function_single.
+ *
+ * @param pvInfo Pointer to the RTMPARGS package.
+ */
+static void rtmpOnSpecificLinuxWrapper(void *pvInfo)
+{
+ PRTMPARGS pArgs = (PRTMPARGS)pvInfo;
+ RTCPUID idCpu = RTMpCpuId();
+
+ if (idCpu == pArgs->idCpu)
+ {
+ pArgs->pfnWorker(idCpu, pArgs->pvUser1, pArgs->pvUser2);
+ ASMAtomicIncU32(&pArgs->cHits);
+ }
+}
+#endif
+
+
+RTDECL(int) RTMpOnSpecific(RTCPUID idCpu, PFNRTMPWORKER pfnWorker, void *pvUser1, void *pvUser2)
+{
+ IPRT_LINUX_SAVE_EFL_AC();
+ int rc;
+ RTMPARGS Args;
+
+ RTTHREADPREEMPTSTATE PreemptState = RTTHREADPREEMPTSTATE_INITIALIZER;
+ Args.pfnWorker = pfnWorker;
+ Args.pvUser1 = pvUser1;
+ Args.pvUser2 = pvUser2;
+ Args.idCpu = idCpu;
+ Args.cHits = 0;
+
+ if (!RTMpIsCpuPossible(idCpu))
+ return VERR_CPU_NOT_FOUND;
+
+ RTThreadPreemptDisable(&PreemptState);
+ if (idCpu != RTMpCpuId())
+ {
+#ifdef CONFIG_SMP
+ if (RTMpIsCpuOnline(idCpu))
+ {
+# if RTLNX_VER_MIN(2,6,27)
+ rc = smp_call_function_single(idCpu, rtmpLinuxWrapper, &Args, 1 /* wait */);
+# elif RTLNX_VER_MIN(2,6,19)
+ rc = smp_call_function_single(idCpu, rtmpLinuxWrapper, &Args, 0 /* retry */, 1 /* wait */);
+# else /* older kernels */
+ rc = smp_call_function(rtmpOnSpecificLinuxWrapper, &Args, 0 /* retry */, 1 /* wait */);
+# endif /* older kernels */
+ Assert(rc == 0);
+ rc = Args.cHits ? VINF_SUCCESS : VERR_CPU_OFFLINE;
+ }
+ else
+#endif /* CONFIG_SMP */
+ rc = VERR_CPU_OFFLINE;
+ }
+ else
+ {
+ rtmpLinuxWrapper(&Args);
+ rc = VINF_SUCCESS;
+ }
+ RTThreadPreemptRestore(&PreemptState);;
+
+ NOREF(rc);
+ IPRT_LINUX_RESTORE_EFL_AC();
+ return rc;
+}
+RT_EXPORT_SYMBOL(RTMpOnSpecific);
+
+
+#if RTLNX_VER_MIN(2,6,19) && defined(CONFIG_SMP)
+/**
+ * Dummy callback used by RTMpPokeCpu.
+ *
+ * @param pvInfo Ignored.
+ */
+static void rtmpLinuxPokeCpuCallback(void *pvInfo)
+{
+ NOREF(pvInfo);
+}
+#endif
+
+
+RTDECL(int) RTMpPokeCpu(RTCPUID idCpu)
+{
+#if RTLNX_VER_MIN(2,6,19)
+ IPRT_LINUX_SAVE_EFL_AC();
+ int rc;
+ if (RTMpIsCpuPossible(idCpu))
+ {
+ if (RTMpIsCpuOnline(idCpu))
+ {
+# ifdef CONFIG_SMP
+# if RTLNX_VER_MIN(2,6,27)
+ rc = smp_call_function_single(idCpu, rtmpLinuxPokeCpuCallback, NULL, 0 /* wait */);
+# elif RTLNX_VER_MIN(2,6,19)
+ rc = smp_call_function_single(idCpu, rtmpLinuxPokeCpuCallback, NULL, 0 /* retry */, 0 /* wait */);
+# else /* older kernels */
+# error oops
+# endif /* older kernels */
+ Assert(rc == 0);
+# endif /* CONFIG_SMP */
+ rc = VINF_SUCCESS;
+ }
+ else
+ rc = VERR_CPU_OFFLINE;
+ }
+ else
+ rc = VERR_CPU_NOT_FOUND;
+ IPRT_LINUX_RESTORE_EFL_AC();
+ return rc;
+
+#else /* older kernels */
+ /* no unicast here? */
+ return VERR_NOT_SUPPORTED;
+#endif /* older kernels */
+}
+RT_EXPORT_SYMBOL(RTMpPokeCpu);
+
+
+RTDECL(bool) RTMpOnAllIsConcurrentSafe(void)
+{
+ return true;
+}
+RT_EXPORT_SYMBOL(RTMpOnAllIsConcurrentSafe);
+
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