Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 549 insertions, 0 deletions

diff --git a/kernel/arch/Kconfig b/kernel/arch/Kconfig
new file mode 100644
index 000000000..cb27d367b
--- /dev/null
+++ b/kernel/arch/Kconfig
@@ -0,0 +1,549 @@
+#
+# General architecture dependent options
+#
+
+config OPROFILE
+	tristate "OProfile system profiling"
+	depends on PROFILING
+	depends on HAVE_OPROFILE
+	depends on !PREEMPT_RT_FULL
+	select RING_BUFFER
+	select RING_BUFFER_ALLOW_SWAP
+	help
+	  OProfile is a profiling system capable of profiling the
+	  whole system, include the kernel, kernel modules, libraries,
+	  and applications.
+
+	  If unsure, say N.
+
+config OPROFILE_EVENT_MULTIPLEX
+	bool "OProfile multiplexing support (EXPERIMENTAL)"
+	default n
+	depends on OPROFILE && X86
+	help
+	  The number of hardware counters is limited. The multiplexing
+	  feature enables OProfile to gather more events than counters
+	  are provided by the hardware. This is realized by switching
+	  between events at an user specified time interval.
+
+	  If unsure, say N.
+
+config HAVE_OPROFILE
+	bool
+
+config OPROFILE_NMI_TIMER
+	def_bool y
+	depends on PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !PPC64
+
+config KPROBES
+	bool "Kprobes"
+	depends on MODULES
+	depends on HAVE_KPROBES
+	select KALLSYMS
+	help
+	  Kprobes allows you to trap at almost any kernel address and
+	  execute a callback function.  register_kprobe() establishes
+	  a probepoint and specifies the callback.  Kprobes is useful
+	  for kernel debugging, non-intrusive instrumentation and testing.
+	  If in doubt, say "N".
+
+config JUMP_LABEL
+       bool "Optimize very unlikely/likely branches"
+       depends on HAVE_ARCH_JUMP_LABEL
+       help
+         This option enables a transparent branch optimization that
+	 makes certain almost-always-true or almost-always-false branch
+	 conditions even cheaper to execute within the kernel.
+
+	 Certain performance-sensitive kernel code, such as trace points,
+	 scheduler functionality, networking code and KVM have such
+	 branches and include support for this optimization technique.
+
+         If it is detected that the compiler has support for "asm goto",
+	 the kernel will compile such branches with just a nop
+	 instruction. When the condition flag is toggled to true, the
+	 nop will be converted to a jump instruction to execute the
+	 conditional block of instructions.
+
+	 This technique lowers overhead and stress on the branch prediction
+	 of the processor and generally makes the kernel faster. The update
+	 of the condition is slower, but those are always very rare.
+
+	 ( On 32-bit x86, the necessary options added to the compiler
+	   flags may increase the size of the kernel slightly. )
+
+config OPTPROBES
+	def_bool y
+	depends on KPROBES && HAVE_OPTPROBES
+	depends on !PREEMPT
+
+config KPROBES_ON_FTRACE
+	def_bool y
+	depends on KPROBES && HAVE_KPROBES_ON_FTRACE
+	depends on DYNAMIC_FTRACE_WITH_REGS
+	help
+	 If function tracer is enabled and the arch supports full
+	 passing of pt_regs to function tracing, then kprobes can
+	 optimize on top of function tracing.
+
+config UPROBES
+	def_bool n
+	select PERCPU_RWSEM
+	help
+	  Uprobes is the user-space counterpart to kprobes: they
+	  enable instrumentation applications (such as 'perf probe')
+	  to establish unintrusive probes in user-space binaries and
+	  libraries, by executing handler functions when the probes
+	  are hit by user-space applications.
+
+	  ( These probes come in the form of single-byte breakpoints,
+	    managed by the kernel and kept transparent to the probed
+	    application. )
+
+config HAVE_64BIT_ALIGNED_ACCESS
+	def_bool 64BIT && !HAVE_EFFICIENT_UNALIGNED_ACCESS
+	help
+	  Some architectures require 64 bit accesses to be 64 bit
+	  aligned, which also requires structs containing 64 bit values
+	  to be 64 bit aligned too. This includes some 32 bit
+	  architectures which can do 64 bit accesses, as well as 64 bit
+	  architectures without unaligned access.
+
+	  This symbol should be selected by an architecture if 64 bit
+	  accesses are required to be 64 bit aligned in this way even
+	  though it is not a 64 bit architecture.
+
+	  See Documentation/unaligned-memory-access.txt for more
+	  information on the topic of unaligned memory accesses.
+
+config HAVE_EFFICIENT_UNALIGNED_ACCESS
+	bool
+	help
+	  Some architectures are unable to perform unaligned accesses
+	  without the use of get_unaligned/put_unaligned. Others are
+	  unable to perform such accesses efficiently (e.g. trap on
+	  unaligned access and require fixing it up in the exception
+	  handler.)
+
+	  This symbol should be selected by an architecture if it can
+	  perform unaligned accesses efficiently to allow different
+	  code paths to be selected for these cases. Some network
+	  drivers, for example, could opt to not fix up alignment
+	  problems with received packets if doing so would not help
+	  much.
+
+	  See Documentation/unaligned-memory-access.txt for more
+	  information on the topic of unaligned memory accesses.
+
+config ARCH_USE_BUILTIN_BSWAP
+       bool
+       help
+	 Modern versions of GCC (since 4.4) have builtin functions
+	 for handling byte-swapping. Using these, instead of the old
+	 inline assembler that the architecture code provides in the
+	 __arch_bswapXX() macros, allows the compiler to see what's
+	 happening and offers more opportunity for optimisation. In
+	 particular, the compiler will be able to combine the byteswap
+	 with a nearby load or store and use load-and-swap or
+	 store-and-swap instructions if the architecture has them. It
+	 should almost *never* result in code which is worse than the
+	 hand-coded assembler in <asm/swab.h>.  But just in case it
+	 does, the use of the builtins is optional.
+
+	 Any architecture with load-and-swap or store-and-swap
+	 instructions should set this. And it shouldn't hurt to set it
+	 on architectures that don't have such instructions.
+
+config KRETPROBES
+	def_bool y
+	depends on KPROBES && HAVE_KRETPROBES
+
+config USER_RETURN_NOTIFIER
+	bool
+	depends on HAVE_USER_RETURN_NOTIFIER
+	help
+	  Provide a kernel-internal notification when a cpu is about to
+	  switch to user mode.
+
+config HAVE_IOREMAP_PROT
+	bool
+
+config HAVE_KPROBES
+	bool
+
+config HAVE_KRETPROBES
+	bool
+
+config HAVE_OPTPROBES
+	bool
+
+config HAVE_KPROBES_ON_FTRACE
+	bool
+
+config HAVE_NMI_WATCHDOG
+	bool
+#
+# An arch should select this if it provides all these things:
+#
+#	task_pt_regs()		in asm/processor.h or asm/ptrace.h
+#	arch_has_single_step()	if there is hardware single-step support
+#	arch_has_block_step()	if there is hardware block-step support
+#	asm/syscall.h		supplying asm-generic/syscall.h interface
+#	linux/regset.h		user_regset interfaces
+#	CORE_DUMP_USE_REGSET	#define'd in linux/elf.h
+#	TIF_SYSCALL_TRACE	calls tracehook_report_syscall_{entry,exit}
+#	TIF_NOTIFY_RESUME	calls tracehook_notify_resume()
+#	signal delivery		calls tracehook_signal_handler()
+#
+config HAVE_ARCH_TRACEHOOK
+	bool
+
+config HAVE_DMA_ATTRS
+	bool
+
+config HAVE_DMA_CONTIGUOUS
+	bool
+
+config GENERIC_SMP_IDLE_THREAD
+       bool
+
+config GENERIC_IDLE_POLL_SETUP
+       bool
+
+# Select if arch init_task initializer is different to init/init_task.c
+config ARCH_INIT_TASK
+       bool
+
+# Select if arch has its private alloc_task_struct() function
+config ARCH_TASK_STRUCT_ALLOCATOR
+	bool
+
+# Select if arch has its private alloc_thread_info() function
+config ARCH_THREAD_INFO_ALLOCATOR
+	bool
+
+config HAVE_REGS_AND_STACK_ACCESS_API
+	bool
+	help
+	  This symbol should be selected by an architecure if it supports
+	  the API needed to access registers and stack entries from pt_regs,
+	  declared in asm/ptrace.h
+	  For example the kprobes-based event tracer needs this API.
+
+config HAVE_CLK
+	bool
+	help
+	  The <linux/clk.h> calls support software clock gating and
+	  thus are a key power management tool on many systems.
+
+config HAVE_DMA_API_DEBUG
+	bool
+
+config HAVE_HW_BREAKPOINT
+	bool
+	depends on PERF_EVENTS
+
+config HAVE_MIXED_BREAKPOINTS_REGS
+	bool
+	depends on HAVE_HW_BREAKPOINT
+	help
+	  Depending on the arch implementation of hardware breakpoints,
+	  some of them have separate registers for data and instruction
+	  breakpoints addresses, others have mixed registers to store
+	  them but define the access type in a control register.
+	  Select this option if your arch implements breakpoints under the
+	  latter fashion.
+
+config HAVE_USER_RETURN_NOTIFIER
+	bool
+
+config HAVE_PERF_EVENTS_NMI
+	bool
+	help
+	  System hardware can generate an NMI using the perf event
+	  subsystem.  Also has support for calculating CPU cycle events
+	  to determine how many clock cycles in a given period.
+
+config HAVE_PERF_REGS
+	bool
+	help
+	  Support selective register dumps for perf events. This includes
+	  bit-mapping of each registers and a unique architecture id.
+
+config HAVE_PERF_USER_STACK_DUMP
+	bool
+	help
+	  Support user stack dumps for perf event samples. This needs
+	  access to the user stack pointer which is not unified across
+	  architectures.
+
+config HAVE_ARCH_JUMP_LABEL
+	bool
+
+config HAVE_RCU_TABLE_FREE
+	bool
+
+config ARCH_HAVE_NMI_SAFE_CMPXCHG
+	bool
+
+config HAVE_ALIGNED_STRUCT_PAGE
+	bool
+	help
+	  This makes sure that struct pages are double word aligned and that
+	  e.g. the SLUB allocator can perform double word atomic operations
+	  on a struct page for better performance. However selecting this
+	  might increase the size of a struct page by a word.
+
+config HAVE_CMPXCHG_LOCAL
+	bool
+
+config HAVE_CMPXCHG_DOUBLE
+	bool
+
+config ARCH_WANT_IPC_PARSE_VERSION
+	bool
+
+config ARCH_WANT_COMPAT_IPC_PARSE_VERSION
+	bool
+
+config ARCH_WANT_OLD_COMPAT_IPC
+	select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
+	bool
+
+config HAVE_ARCH_SECCOMP_FILTER
+	bool
+	help
+	  An arch should select this symbol if it provides all of these things:
+	  - syscall_get_arch()
+	  - syscall_get_arguments()
+	  - syscall_rollback()
+	  - syscall_set_return_value()
+	  - SIGSYS siginfo_t support
+	  - secure_computing is called from a ptrace_event()-safe context
+	  - secure_computing return value is checked and a return value of -1
+	    results in the system call being skipped immediately.
+	  - seccomp syscall wired up
+
+	  For best performance, an arch should use seccomp_phase1 and
+	  seccomp_phase2 directly.  It should call seccomp_phase1 for all
+	  syscalls if TIF_SECCOMP is set, but seccomp_phase1 does not
+	  need to be called from a ptrace-safe context.  It must then
+	  call seccomp_phase2 if seccomp_phase1 returns anything other
+	  than SECCOMP_PHASE1_OK or SECCOMP_PHASE1_SKIP.
+
+	  As an additional optimization, an arch may provide seccomp_data
+	  directly to seccomp_phase1; this avoids multiple calls
+	  to the syscall_xyz helpers for every syscall.
+
+config SECCOMP_FILTER
+	def_bool y
+	depends on HAVE_ARCH_SECCOMP_FILTER && SECCOMP && NET
+	help
+	  Enable tasks to build secure computing environments defined
+	  in terms of Berkeley Packet Filter programs which implement
+	  task-defined system call filtering polices.
+
+	  See Documentation/prctl/seccomp_filter.txt for details.
+
+config HAVE_CC_STACKPROTECTOR
+	bool
+	help
+	  An arch should select this symbol if:
+	  - its compiler supports the -fstack-protector option
+	  - it has implemented a stack canary (e.g. __stack_chk_guard)
+
+config CC_STACKPROTECTOR
+	def_bool n
+	help
+	  Set when a stack-protector mode is enabled, so that the build
+	  can enable kernel-side support for the GCC feature.
+
+choice
+	prompt "Stack Protector buffer overflow detection"
+	depends on HAVE_CC_STACKPROTECTOR
+	default CC_STACKPROTECTOR_NONE
+	help
+	  This option turns on the "stack-protector" GCC feature. This
+	  feature puts, at the beginning of functions, a canary value on
+	  the stack just before the return address, and validates
+	  the value just before actually returning.  Stack based buffer
+	  overflows (that need to overwrite this return address) now also
+	  overwrite the canary, which gets detected and the attack is then
+	  neutralized via a kernel panic.
+
+config CC_STACKPROTECTOR_NONE
+	bool "None"
+	help
+	  Disable "stack-protector" GCC feature.
+
+config CC_STACKPROTECTOR_REGULAR
+	bool "Regular"
+	select CC_STACKPROTECTOR
+	help
+	  Functions will have the stack-protector canary logic added if they
+	  have an 8-byte or larger character array on the stack.
+
+	  This feature requires gcc version 4.2 or above, or a distribution
+	  gcc with the feature backported ("-fstack-protector").
+
+	  On an x86 "defconfig" build, this feature adds canary checks to
+	  about 3% of all kernel functions, which increases kernel code size
+	  by about 0.3%.
+
+config CC_STACKPROTECTOR_STRONG
+	bool "Strong"
+	select CC_STACKPROTECTOR
+	help
+	  Functions will have the stack-protector canary logic added in any
+	  of the following conditions:
+
+	  - local variable's address used as part of the right hand side of an
+	    assignment or function argument
+	  - local variable is an array (or union containing an array),
+	    regardless of array type or length
+	  - uses register local variables
+
+	  This feature requires gcc version 4.9 or above, or a distribution
+	  gcc with the feature backported ("-fstack-protector-strong").
+
+	  On an x86 "defconfig" build, this feature adds canary checks to
+	  about 20% of all kernel functions, which increases the kernel code
+	  size by about 2%.
+
+endchoice
+
+config HAVE_CONTEXT_TRACKING
+	bool
+	help
+	  Provide kernel/user boundaries probes necessary for subsystems
+	  that need it, such as userspace RCU extended quiescent state.
+	  Syscalls need to be wrapped inside user_exit()-user_enter() through
+	  the slow path using TIF_NOHZ flag. Exceptions handlers must be
+	  wrapped as well. Irqs are already protected inside
+	  rcu_irq_enter/rcu_irq_exit() but preemption or signal handling on
+	  irq exit still need to be protected.
+
+config HAVE_VIRT_CPU_ACCOUNTING
+	bool
+
+config HAVE_VIRT_CPU_ACCOUNTING_GEN
+	bool
+	default y if 64BIT
+	help
+	  With VIRT_CPU_ACCOUNTING_GEN, cputime_t becomes 64-bit.
+	  Before enabling this option, arch code must be audited
+	  to ensure there are no races in concurrent read/write of
+	  cputime_t. For example, reading/writing 64-bit cputime_t on
+	  some 32-bit arches may require multiple accesses, so proper
+	  locking is needed to protect against concurrent accesses.
+
+
+config HAVE_IRQ_TIME_ACCOUNTING
+	bool
+	help
+	  Archs need to ensure they use a high enough resolution clock to
+	  support irq time accounting and then call enable_sched_clock_irqtime().
+
+config HAVE_ARCH_TRANSPARENT_HUGEPAGE
+	bool
+
+config HAVE_ARCH_HUGE_VMAP
+	bool
+
+config HAVE_ARCH_SOFT_DIRTY
+	bool
+
+config HAVE_MOD_ARCH_SPECIFIC
+	bool
+	help
+	  The arch uses struct mod_arch_specific to store data.  Many arches
+	  just need a simple module loader without arch specific data - those
+	  should not enable this.
+
+config MODULES_USE_ELF_RELA
+	bool
+	help
+	  Modules only use ELF RELA relocations.  Modules with ELF REL
+	  relocations will give an error.
+
+config MODULES_USE_ELF_REL
+	bool
+	help
+	  Modules only use ELF REL relocations.  Modules with ELF RELA
+	  relocations will give an error.
+
+config HAVE_UNDERSCORE_SYMBOL_PREFIX
+	bool
+	help
+	  Some architectures generate an _ in front of C symbols; things like
+	  module loading and assembly files need to know about this.
+
+config HAVE_IRQ_EXIT_ON_IRQ_STACK
+	bool
+	help
+	  Architecture doesn't only execute the irq handler on the irq stack
+	  but also irq_exit(). This way we can process softirqs on this irq
+	  stack instead of switching to a new one when we call __do_softirq()
+	  in the end of an hardirq.
+	  This spares a stack switch and improves cache usage on softirq
+	  processing.
+
+config PGTABLE_LEVELS
+	int
+	default 2
+
+config ARCH_HAS_ELF_RANDOMIZE
+	bool
+	help
+	  An architecture supports choosing randomized locations for
+	  stack, mmap, brk, and ET_DYN. Defined functions:
+	  - arch_mmap_rnd()
+	  - arch_randomize_brk()
+
+#
+# ABI hall of shame
+#
+config CLONE_BACKWARDS
+	bool
+	help
+	  Architecture has tls passed as the 4th argument of clone(2),
+	  not the 5th one.
+
+config CLONE_BACKWARDS2
+	bool
+	help
+	  Architecture has the first two arguments of clone(2) swapped.
+
+config CLONE_BACKWARDS3
+	bool
+	help
+	  Architecture has tls passed as the 3rd argument of clone(2),
+	  not the 5th one.
+
+config ODD_RT_SIGACTION
+	bool
+	help
+	  Architecture has unusual rt_sigaction(2) arguments
+
+config OLD_SIGSUSPEND
+	bool
+	help
+	  Architecture has old sigsuspend(2) syscall, of one-argument variety
+
+config OLD_SIGSUSPEND3
+	bool
+	help
+	  Even weirder antique ABI - three-argument sigsuspend(2)
+
+config OLD_SIGACTION
+	bool
+	help
+	  Architecture has old sigaction(2) syscall.  Nope, not the same
+	  as OLD_SIGSUSPEND | OLD_SIGSUSPEND3 - alpha has sigsuspend(2),
+	  but fairly different variant of sigaction(2), thanks to OSF/1
+	  compatibility...
+
+config COMPAT_OLD_SIGACTION
+	bool
+
+source "kernel/gcov/Kconfig"