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* x86: page.h: move and unify types for pagetable entry, #2Ingo Molnar2008-01-301-3/+3
| | | | | | | | | | based on: Subject: x86: page.h: move and unify types for pagetable entry From: Jeremy Fitzhardinge <jeremy@goop.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: page.h: move and unify types for pagetable entry, #1Ingo Molnar2008-01-301-0/+6
| | | | | | | | | | based on: Subject: x86: page.h: move and unify types for pagetable entry From: Jeremy Fitzhardinge <jeremy@goop.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: page.h: unify page copying and clearingJeremy Fitzhardinge2008-01-303-73/+55
| | | | | | | | | | | | | | | | | | # HG changeset patch # User Jeremy Fitzhardinge <jeremy@xensource.com> # Date 1199317362 28800 # Node ID 4d9a413a0f4c1d98dbea704f0366457b5117045d # Parent ba0ec40a50a7aef1a3153cea124c35e261f5a2df x86: page.h: unify page copying and clearing Move, and to some extent unify, the various page copying and clearing functions. The only unification here is that both architectures use the same function for copying/clearing user and kernel pages. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: page.h: unify constantsJeremy Fitzhardinge2008-01-303-126/+119
| | | | | | | | | | | | | | | | # HG changeset patch # User Jeremy Fitzhardinge <jeremy@xensource.com> # Date 1199317360 28800 # Node ID ba0ec40a50a7aef1a3153cea124c35e261f5a2df # Parent c45c263179cb78284b6b869c574457df088027d1 x86: page.h: unify constants There are many constants which are shared by 32 and 64-bit. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: remove the now unused X86_FEATURE_SYNC_RDTSCAndi Kleen2008-01-301-1/+1
| | | | | | | | we need to know whether RDTSC is synchronous or not. Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: fix sched_clock()Ingo Molnar2008-01-302-1/+12
| | | | | | | [ andi@firstfloor.org: build fix ] Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: remove get_cycles_syncAndi Kleen2008-01-301-52/+8
| | | | | | | | | | | rdtsc is now speculation-safe, so no need for the sync variants of the APIs. [ mingo@elte.hu: removed the nsec_barrier() complication. ] Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: map vsyscalls early enoughIngo Molnar2008-01-301-0/+2
| | | | | | | | map vsyscalls early enough. This is important if a __vsyscall_fn function is used by other kernel code too. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: move native_read_tsc() offlineIngo Molnar2008-01-301-7/+1
| | | | | | | move native_read_tsc() offline. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: introduce rdtsc_barrier()Andi Kleen2008-01-301-0/+13
| | | | | | | | | | | | | | | | rdtsc_barrier() is a new barrier primitive that stops RDTSC speculation to avoid races with timer interrupts on other CPUs. It expands either to LFENCE (for Intel CPUs) or MFENCE (for AMD CPUs) which stops RDTSC on all currently known microarchitectures that implement SSE. On CPUs without SSE there is generally no RDTSC speculation. [ mingo@elte.hu: renamed it to rdtsc_barrier() and made it x86-only ] Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: move nop declarations into separate include fileAndi Kleen2008-01-302-85/+91
| | | | | | | | | | Moving things out of processor.h is always a good thing. Also needed to avoid include loop in later patch. Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: Implement support to synchronize RDTSC with LFENCE on Intel CPUsAndi Kleen2008-01-301-0/+1
| | | | | | | | | | | | | According to Intel RDTSC can be always synchronized with LFENCE on all current CPUs. Implement the necessary CPUID bit for that. It is unclear yet if that is true for all future CPUs too, but if there's another way the kernel can be always updated. Cc: asit.k.mallick@intel.com Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: implement support to synchronize RDTSC through MFENCE on AMD CPUsAndi Kleen2008-01-301-0/+1
| | | | | | | | | | According to AMD RDTSC can be synchronized through MFENCE. Implement the necessary CPUID bit for that. Cc: andreas.herrmann3@amd.com Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: make ptrace.h safe to include from assembler codeAndi Kleen2008-01-301-0/+2
| | | | | | Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: move patching code to arch-specific file.Glauber de Oliveira Costa2008-01-301-0/+8
| | | | | | | | | The core patching code for paravirt is sufficiently different among i386 and x86_64, and we move them to specific files. Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: add CLBR_ defines for 64-bitGlauber de Oliveira Costa2008-01-301-5/+18
| | | | | | | | | | | x86_64 needs a potentially larger clobber list than i386, due to its calling convention. So we add more CLBR_ defines for it. Note that CLBR_ANY is different for each of the architectures, since it comprises the notion of "All call clobbers in this architecture" Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: cleanup CLI_STRING, STI_STRING and friendsGlauber de Oliveira Costa2008-01-301-9/+0
| | | | | | | | | Since the advent of ticket locking, CLI_STRING, STI_STRING, and friends are not used anymore. They can now be safely deleted. Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: adds paravirt hook for swapgsGlauber de Oliveira Costa2008-01-302-0/+17
| | | | | | | | | This patch adds paravirt hook for swapgs operation, which is a privileged operation in x86_64. Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: add macro for privileged 64-bit operationGlauber de Oliveira Costa2008-01-301-0/+6
| | | | | | | | | | i386 has a macro GET_CR0_INTO_EAX, used in early trap handling code. x86_64 has similar needs, only it needs to put cr2 into rcx. We provide a macro for such task, in the same way Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: change irq functions to accomodate 64-bitGlauber de Oliveira Costa2008-01-301-13/+30
| | | | | | | | | | This patch changes the irq handling function definitions in paravirt.h (like raw_local_irq_disable) to accomodate for x86_64. The differences are in the calling convention. Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: adjust assembly macros on 64-bit as well.Glauber de Oliveira Costa2008-01-301-6/+12
| | | | | | | | | This patch adjust the paravirt macros used in assembly code to accomodate for x86_64 as well. Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: change assembly definition of paravirt_patch_siteGlauber de Oliveira Costa2008-01-301-3/+13
| | | | | | | | | | | | To account for differences in x86_64, we change the macros that create raw instances of the paravirt_patch_site struct. We need to align 64-pointers to 64-bit boundaries, so we add an alignment directive. Also, we need to make room for a word-sized pointer, instead of a fixed 32-bit one Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: provide paravirtualized hook for rdtscpGlauber de Oliveira Costa2008-01-301-0/+22
| | | | | | | | | This patch adds a field in pv_cpu_ops for a paravirtualized hook for rdtscp, needed for x86_64. Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: cleanup write_tscGlauber de Oliveira Costa2008-01-302-4/+0
| | | | | | | | | | write_tsc() does not need to be enclosed in any paravirt closure, as it uses wrmsr(). So we rip off the duplicate in msr.h and the definition from paravirt.h Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: adjust PVOP_CALL/VCALL macros for 64-bitGlauber de Oliveira Costa2008-01-301-22/+65
| | | | | | | | | | | | | This patch adjust the PVOP_VCALL and PVOP_CALL macros to work with x86_64. It has a different calling convention, and we use auxiliary macros to account for both calling conventions as cleanly as possible Comments are adjusted accordingly. Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86, ptrace: overflow signal APIMarkus Metzger2008-01-301-1/+3
| | | | | | | | | | | | | | | | Establish the user API for sending a user-defined signal to the traced task on a BTS buffer overflow. This should complete the user API for the BTS ptrace extension. The patches so far implement wrap-around overflow handling as is needed for debugging. The remaining open is another overflow handling mechanism that sends a signal to the traced task on a buffer overflow. This will take some more time from my side. Since, from a user perspective, this occurs behind the scenes, the patch set should already be useful. More features may/will be added on top of it (overflow signal, pageable back-up buffers, kernel tracing, core file support, profiling, ...). Signed-off-by: Markus Metzger <markus.t.metzger@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86, ptrace: add buffer size checksMarkus Metzger2008-01-301-6/+8
| | | | | | | | | Pass the buffer size for (most) ptrace commands that pass user-allocated buffers and check that size before accessing the buffer. Unfortunately, PTRACE_BTS_GET already uses all 4 parameters. Commands that access user buffers return the number of bytes or records read or written. Signed-off-by: Markus Metzger <markus.t.metzger@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86, ptrace: support 32bit-cross-64bit BTS recordingMarkus Metzger2008-01-302-7/+7
| | | | | | | | Support BTS recording of 32bit and 64bit tasks from 32bit or 64bit tasks. Signed-off-by: Markus Metzger <markus.t.metzger@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: voluntary leave_mm before entering ACPI C3Venki Pallipadi2008-01-303-2/+11
| | | | | | | | | | | | | | | | | | | | | Aviod TLB flush IPIs during C3 states by voluntary leave_mm() before entering C3. The performance impact of TLB flush on C3 should not be significant with respect to C3 wakeup latency. Also, CPUs tend to flush TLB in hardware while in C3 anyways. On a 8 logical CPU system, running make -j2, the number of tlbflush IPIs goes down from 40 per second to ~ 0. Total number of interrupts during the run of this workload was ~1200 per second, which makes it ~3% savings in wakeups. There was no measurable performance or power impact however. [ akpm@linux-foundation.org: symbol export fixes. ] Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: fix dmi_alloc() to not advance alloc index in case ofParag Warudkar2008-01-301-1/+2
| | | | | | | | | | | | | | | dmi_alloc() for CONFIG_X86_64 is defined to allocate from a static array and it maintains a allocation index which is advanced each time allocation is attempted - it gets incremented even if an allocation fails thereby depriving any future request that may be small enough to be satisfied from the array. Fix this by first testing if allocation is going to be possible and incrementing alloc index only then. Signed-off-by: Parag Warudkar <parag.warudkar@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: remove unused include/asm-x86/processor_32/64.hIngo Molnar2008-01-302-163/+0
| | | | | | | remove unused include/asm-x86/processor_32/64.h. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: finish processor.h integrationGlauber de Oliveira Costa2008-01-301-3/+137
| | | | | | | | | | | What's left in processor_32.h and processor_64.h cannot be cleanly integrated. However, it's just a couple of definitions. They are moved to processor.h around ifdefs, and the original files are deleted. Note that there's much less headers included in the final version. Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: remove __init modifier from header declarationGlauber de Oliveira Costa2008-01-301-1/+1
| | | | | | | | | | | | | This patch removes the __init modifier from an extern function declaration in acpi.h. Besides not being strictly needed, it requires the inclusion of linux/init.h, which is usually not even included directly, increasing header mess by a lot. Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: compat_binfmt_elfRoland McGrath2008-01-301-24/+64
| | | | | | | | | This switches x86-64's 32-bit ELF support to use the shared fs/compat_binfmt_elf.c code instead of our own ia32_binfmt.c. Signed-off-by: Roland McGrath <roland@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: x86 user_regset cleanupRoland McGrath2008-01-303-87/+0
| | | | | | | | | This removes a bunch of dead code that is no longer needed now that the user_regset interfaces are being used for all these jobs. Signed-off-by: Roland McGrath <roland@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: x86 CORE_DUMP_USE_REGSETRoland McGrath2008-01-301-0/+1
| | | | | | | | | This switches x86 to the user_regset-based code for ELF core dumps. The core dumps come out exactly the same as before. Signed-off-by: Roland McGrath <roland@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: x86 TLS desc_struct cleanupRoland McGrath2008-01-301-2/+9
| | | | | | | | | This cleans up the TLS code to use struct desc_struct and to separate the encoding and installation magic from the interface wrappers. Signed-off-by: Roland McGrath <roland@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: x86 i387 cleanupRoland McGrath2008-01-303-524/+374
| | | | | | | | | | | This removes all the old code that is no longer used after the i387 unification and cleanup. The i387_64.h is renamed to i387.h with no changes, but since it replaces the nonempty one-line stub i387.h it looks like a big diff and not a rename. Signed-off-by: Roland McGrath <roland@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: x86 i387 user_regsetRoland McGrath2008-01-303-15/+12
| | | | | | | | | | | | | | | This revamps the i387 code to be shared across 32-bit, 64-bit, and 32-on-64. It does so by consolidating the code in one place based on the user_regset accessor interfaces. This switches 32-bit to using the i387_64.h header and 64-bit to using the i387.c that was previously i387_32.c, but that's what took the least cleanup in each file. Here i387.h is stubbed to always include i387_64.h rather than renaming the file, to keep this diff smaller and easier to read. Signed-off-by: Roland McGrath <roland@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: x86 i387 header cleanupRoland McGrath2008-01-301-82/+233
| | | | | | | | | | | | | | | This moves some code into asm-x86/i387_64.h in preparation for unifying this code between 32 and 64. The 32-bit versions of some things are copied in some existing names changed to match 32-bit names and share code. For 64, save_i387 is moved into an inline from i387_64.c; this matches restore_i387, which is already an inline, and makes sense since there is exactly one caller (in signal_64.c). The save_i387 function could use more cosmetic cleanup, but it is just moved verbatim in this patch. Signed-off-by: Roland McGrath <roland@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: x86 i387 unify structsRoland McGrath2008-01-301-50/+42
| | | | | | | | | | | | | The i387_fxsave_struct formats really have the same layout on 32 and 64, with only some slightly different use of a few fields. The i387_fsave_struct and i387_soft_struct formats are never used by 64-bit kernels, but it doesn't hurt to have the unused types in the union and cuts down on the amount of #ifdef hair required throughout the i387 code. Signed-off-by: Roland McGrath <roland@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: x86-64 wired cpu_has macrosRoland McGrath2008-01-301-0/+12
| | | | | | | | | | | This adds hard-wired definitions for the remaining cpu_has_* macros that correspond to flags required-features.h demands are set for 64-bit. Using these can efficiently avoid some #ifdef's when merging 32-bit and 64-bit code together. Signed-off-by: Roland McGrath <roland@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: unify module_{32|64}.hHarvey Harrison2008-01-303-87/+79
| | | | | | | | | | This adds one case to the MODULE_PROC_FAMILY block testing for X86_64. There are no new things defined on X86_64 than there were before. Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: use helper in fault_64.cHarvey Harrison2008-01-301-0/+2
| | | | | | | | Use the fixup_exception() helper in fault_64.c Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: move i387 definitions to processor.hGlauber de Oliveira Costa2008-01-303-66/+66
| | | | | | | | | | This patch moves i387 definitions from processor_32.h and processor_64.h to processor.h. They are different. Very different. And there's appearently nothing we can do about it, so they're enclosed inside ifdefs. Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: unify asm nopsGlauber de Oliveira Costa2008-01-303-129/+85
| | | | | | | | | | There's only one difference between the NOPs used in asm code for i386 and x86_64: i386 has a lot more variants. The code is moved to processor.h, and adjusted accordingly. Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: unify prefetch operationsGlauber de Oliveira Costa2008-01-303-33/+30
| | | | | | | | This patch moves the prefetch[w]? functions to processor.h Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: move definitions to processor.hGlauber de Oliveira Costa2008-01-303-41/+41
| | | | | | | | | | This patch moves definitions that are present in only one of the files (between processor_32.h and processor_64.h), to processor.h. They're mostly structures and function definitions. Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: unify mm_segment_t definitionGlauber de Oliveira Costa2008-01-305-15/+6
| | | | | | | | | This patch moves the mm_segment_t structure definition to processor.h This makes mmsegment.h file useless, and it is deleted. Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: remove legacy stuff from processor_64.hGlauber de Oliveira Costa2008-01-301-14/+0
| | | | | | | | | This patch removes definitions and macros that are not used anymore from processor_64.h Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>