Merge branch 'doc/4.2' into docs-next

Documentation/CodingStyle

@@ -670,7 +670,7 @@ functions:
 	typeof(x) ret;			\
 	ret = calc_ret(x);		\
 	(ret);				\
-)}
+})
 
 ret is a common name for a local variable - __foo_ret is less likely
 to collide with an existing variable.

Documentation/DMA-API-HOWTO.txt

@@ -240,7 +240,7 @@ the case would look like this:
 
 	if (!dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64))) {
 		using_dac = 1;
-	   	consistent_using_dac = 1;
+		consistent_using_dac = 1;
 	} else if (!dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32))) {
 		using_dac = 0;
 		consistent_using_dac = 0;
@@ -353,7 +353,7 @@ There are two types of DMA mappings:
   transfer, unmapped right after it (unless you use dma_sync_* below)
   and for which hardware can optimize for sequential accesses.
 
-  This of "streaming" as "asynchronous" or "outside the coherency
+  Think of "streaming" as "asynchronous" or "outside the coherency
   domain".
 
   Good examples of what to use streaming mappings for are:

Documentation/DocBook/kernel-hacking.tmpl

@@ -954,6 +954,8 @@ printk(KERN_INFO "my ip: %pI4\n", &ipaddress);
     <function>MODULE_LICENSE()</function> that specifies a GPL
     compatible license.  It implies that the function is considered
     an internal implementation issue, and not really an interface.
+    Some maintainers and developers may however
+    require EXPORT_SYMBOL_GPL() when adding any new APIs or functionality.
    </para>
   </sect1>
  </chapter>

Documentation/SubmittingPatches

@@ -299,7 +299,9 @@ toward the stable maintainers by putting a line like this:
 
   Cc: stable@vger.kernel.org
 
-into your patch.
+into the sign-off area of your patch (note, NOT an email recipient).  You
+should also read Documentation/stable_kernel_rules.txt in addition to this
+file.
 
 Note, however, that some subsystem maintainers want to come to their own
 conclusions on which patches should go to the stable trees.  The networking

Documentation/arm/Samsung/Bootloader-interface.txt

+      Interface between kernel and boot loaders on Exynos boards
+      ==========================================================
+
+Author: Krzysztof Kozlowski
+Date  : 6 June 2015
+
+The document tries to describe currently used interface between Linux kernel
+and boot loaders on Samsung Exynos based boards. This is not a definition
+of interface but rather a description of existing state, a reference
+for information purpose only.
+
+In the document "boot loader" means any of following: U-boot, proprietary
+SBOOT or any other firmware for ARMv7 and ARMv8 initializing the board before
+executing kernel.
+
+
+1. Non-Secure mode
+Address:      sysram_ns_base_addr
+Offset        Value                                        Purpose
+=============================================================================
+0x08          exynos_cpu_resume_ns                         System suspend
+0x0c          0x00000bad (Magic cookie)                    System suspend
+0x1c          exynos4_secondary_startup                    Secondary CPU boot
+0x1c + 4*cpu  exynos4_secondary_startup (Exynos4412)       Secondary CPU boot
+0x20          0xfcba0d10 (Magic cookie)                    AFTR
+0x24          exynos_cpu_resume_ns                         AFTR
+0x28 + 4*cpu  0x8 (Magic cookie, Exynos3250)               AFTR
+
+
+2. Secure mode
+Address:      sysram_base_addr
+Offset        Value                                        Purpose
+=============================================================================
+0x00          exynos4_secondary_startup                    Secondary CPU boot
+0x04          exynos4_secondary_startup (Exynos542x)       Secondary CPU boot
+4*cpu         exynos4_secondary_startup (Exynos4412)       Secondary CPU boot
+0x20          exynos_cpu_resume (Exynos4210 r1.0)          AFTR
+0x24          0xfcba0d10 (Magic cookie, Exynos4210 r1.0)   AFTR
+
+Address:      pmu_base_addr
+Offset        Value                                        Purpose
+=============================================================================
+0x0800        exynos_cpu_resume                            AFTR
+0x0814        exynos4_secondary_startup (Exynos4210 r1.1)  Secondary CPU boot
+0x0818        0xfcba0d10 (Magic cookie, Exynos4210 r1.1)   AFTR
+0x081C        exynos_cpu_resume (Exynos4210 r1.1)          AFTR
+
+
+3. Other (regardless of secure/non-secure mode)
+Address:      pmu_base_addr
+Offset        Value                           Purpose
+=============================================================================
+0x0908        Non-zero (only Exynos3250)      Secondary CPU boot up indicator

Documentation/blackfin/gptimers-example.c

@@ -17,6 +17,12 @@
 
 #define DRIVER_NAME "gptimer_example"
 
+#ifdef IRQ_TIMER5
+#define SAMPLE_IRQ_TIMER IRQ_TIMER5
+#else
+#define SAMPLE_IRQ_TIMER IRQ_TIMER2
+#endif
+
 struct gptimer_data {
 	uint32_t period, width;
 };
@@ -57,7 +63,8 @@ static int __init gptimer_example_init(void)
 	}
 
 	/* grab the IRQ for the timer */
-	ret = request_irq(IRQ_TIMER5, gptimer_example_irq, IRQF_SHARED, DRIVER_NAME, &data);
+	ret = request_irq(SAMPLE_IRQ_TIMER, gptimer_example_irq,
+			IRQF_SHARED, DRIVER_NAME, &data);
 	if (ret) {
 		printk(KERN_NOTICE DRIVER_NAME ": IRQ request failed\n");
 		peripheral_free(P_TMR5);
@@ -65,7 +72,8 @@ static int __init gptimer_example_init(void)
 	}
 
 	/* setup the timer and enable it */
-	set_gptimer_config(TIMER5_id, WDTH_CAP | PULSE_HI | PERIOD_CNT | IRQ_ENA);
+	set_gptimer_config(TIMER5_id,
+			WDTH_CAP | PULSE_HI | PERIOD_CNT | IRQ_ENA);
 	enable_gptimers(TIMER5bit);
 
 	return 0;
@@ -75,7 +83,7 @@ module_init(gptimer_example_init);
 static void __exit gptimer_example_exit(void)
 {
 	disable_gptimers(TIMER5bit);
-	free_irq(IRQ_TIMER5, &data);
+	free_irq(SAMPLE_IRQ_TIMER, &data);
 	peripheral_free(P_TMR5);
 }
 module_exit(gptimer_example_exit);

Documentation/cpu-freq/governors.txt

@@ -36,7 +36,7 @@ Contents:
 1. What Is A CPUFreq Governor?
 ==============================
 
-Most cpufreq drivers (in fact, all except one, longrun) or even most
+Most cpufreq drivers (except the intel_pstate and longrun) or even most
 cpu frequency scaling algorithms only offer the CPU to be set to one
 frequency. In order to offer dynamic frequency scaling, the cpufreq
 core must be able to tell these drivers of a "target frequency". So

Documentation/cpu-freq/intel-pstate.txt

@@ -3,24 +3,25 @@ Intel P-state driver
 
 This driver provides an interface to control the P state selection for
 SandyBridge+ Intel processors.  The driver can operate two different
-modes based on the processor model legacy and Hardware P state (HWP)
+modes based on the processor model, legacy mode and Hardware P state (HWP)
 mode.
 
-In legacy mode the driver implements a scaling driver with an internal
-governor for Intel Core processors.  The driver follows the same model
-as the Transmeta scaling driver (longrun.c) and implements the
-setpolicy() instead of target().  Scaling drivers that implement
-setpolicy() are assumed to implement internal governors by the cpufreq
-core. All the logic for selecting the current P state is contained
-within the driver; no external governor is used by the cpufreq core.
+In legacy mode, the Intel P-state implements two internal governors,
+performance and powersave, that differ from the general cpufreq governors of
+the same name (the general cpufreq governors implement target(), whereas the
+internal Intel P-state governors implement setpolicy()).  The internal
+performance governor sets the max_perf_pct and min_perf_pct to 100; that is,
+the governor selects the highest available P state to maximize the performance
+of the core.  The internal powersave governor selects the appropriate P state
+based on the current load on the CPU.
 
 In HWP mode P state selection is implemented in the processor
 itself. The driver provides the interfaces between the cpufreq core and
 the processor to control P state selection based on user preferences
 and reporting frequency to the cpufreq core.  In this mode the
-internal governor code is disabled.
+internal Intel P-state governor code is disabled.
 
-In addtion to the interfaces provided by the cpufreq core for
+In addition to the interfaces provided by the cpufreq core for
 controlling frequency the driver provides sysfs files for
 controlling P state selection. These files have been added to
 /sys/devices/system/cpu/intel_pstate/

Documentation/filesystems/porting

@@ -379,10 +379,10 @@ may now be called in rcu-walk mode (nd->flags & LOOKUP_RCU). -ECHILD should be
 returned if the filesystem cannot handle rcu-walk. See
 Documentation/filesystems/vfs.txt for more details.
 
-	permission and check_acl are inode permission checks that are called
-on many or all directory inodes on the way down a path walk (to check for
-exec permission). These must now be rcu-walk aware (flags & IPERM_FLAG_RCU).
-See Documentation/filesystems/vfs.txt for more details.
+	permission is an inode permission check that is called on many or all
+directory inodes on the way down a path walk (to check for exec permission). It
+must now be rcu-walk aware (mask & MAY_NOT_BLOCK).  See
+Documentation/filesystems/vfs.txt for more details.
  
 --
 [mandatory]

Documentation/filesystems/proc.txt

@@ -205,7 +205,7 @@ asynchronous manner and the value may not be very precise. To see a precise
 snapshot of a moment, you can see /proc/<pid>/smaps file and scan page table.
 It's slow but very precise.
 
-Table 1-2: Contents of the status files (as of 3.20.0)
+Table 1-2: Contents of the status files (as of 4.1)
 ..............................................................................
  Field                       Content
  Name                        filename of the executable
@@ -235,6 +235,7 @@ Table 1-2: Contents of the status files (as of 3.20.0)
  VmExe                       size of text segment
  VmLib                       size of shared library code
  VmPTE                       size of page table entries
+ VmPMD                       size of second level page tables
  VmSwap                      size of swap usage (the number of referred swapents)
  Threads                     number of threads
  SigQ                        number of signals queued/max. number for queue

Documentation/filesystems/vfs.txt

@@ -797,7 +797,7 @@ struct file_operations
 ----------------------
 
 This describes how the VFS can manipulate an open file. As of kernel
-3.12, the following members are defined:
+4.1, the following members are defined:
 
 struct file_operations {
 	struct module *owner;
@@ -811,8 +811,9 @@ struct file_operations {
 	long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
 	long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
 	int (*mmap) (struct file *, struct vm_area_struct *);
+	int (*mremap)(struct file *, struct vm_area_struct *);
 	int (*open) (struct inode *, struct file *);
-	int (*flush) (struct file *);
+	int (*flush) (struct file *, fl_owner_t id);
 	int (*release) (struct inode *, struct file *);
 	int (*fsync) (struct file *, loff_t, loff_t, int datasync);
 	int (*aio_fsync) (struct kiocb *, int datasync);
@@ -822,11 +823,15 @@ struct file_operations {
 	unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
 	int (*check_flags)(int);
 	int (*flock) (struct file *, int, struct file_lock *);
-	ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, size_t, unsigned int);
-	ssize_t (*splice_read)(struct file *, struct pipe_inode_info *, size_t, unsigned int);
-	int (*setlease)(struct file *, long arg, struct file_lock **, void **);
-	long (*fallocate)(struct file *, int mode, loff_t offset, loff_t len);
+	ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int);
+	ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int);
+	int (*setlease)(struct file *, long, struct file_lock **, void **);
+	long (*fallocate)(struct file *file, int mode, loff_t offset,
+			  loff_t len);
 	void (*show_fdinfo)(struct seq_file *m, struct file *f);
+#ifndef CONFIG_MMU
+	unsigned (*mmap_capabilities)(struct file *);
+#endif
 };
 
 Again, all methods are called without any locks being held, unless

Documentation/gpio/consumer.txt

@@ -290,7 +290,7 @@ corresponding to a given GPIO using the following call:
 
 	int gpiod_to_irq(const struct gpio_desc *desc)
 
-It will return an IRQ number, or an negative errno code if the mapping can't be
+It will return an IRQ number, or a negative errno code if the mapping can't be
 done (most likely because that particular GPIO cannot be used as IRQ). It is an
 unchecked error to use a GPIO that wasn't set up as an input using
 gpiod_direction_input(), or to use an IRQ number that didn't originally come

Documentation/ja_JP/HOWTO

@@ -445,7 +445,7 @@ MAINTAINERS ファイルにリストがありますので参照してくださ
 メールの先頭でなく、各引用行の間にあなたの言いたいことを追加するべきで
 す。
 
-もしパッチをメールに付ける場合は、Documentaion/SubmittingPatches に提
+もしパッチをメールに付ける場合は、Documentation/SubmittingPatches に提
 示されているように、それは プレーンな可読テキストにすることを忘れない
 ようにしましょう。カーネル開発者は 添付や圧縮したパッチを扱いたがりま
 せん-

Documentation/kasan.txt

@@ -150,7 +150,7 @@ AddressSanitizer dedicates 1/8 of kernel memory to its shadow memory
 (e.g. 16TB to cover 128TB on x86_64) and uses direct mapping with a scale and
 offset to translate a memory address to its corresponding shadow address.
 
-Here is the function witch translate an address to its corresponding shadow
+Here is the function which translates an address to its corresponding shadow
 address:
 
 static inline void *kasan_mem_to_shadow(const void *addr)

Documentation/kbuild/makefiles.txt

@@ -755,8 +755,8 @@ Additional files can be specified in kbuild makefiles by use of $(clean-files).
 		#lib/Makefile
 		clean-files := crc32table.h
 
-When executing "make clean", the two files "devlist.h classlist.h" will be
-deleted. Kbuild will assume files to be in the same relative directory as the
+When executing "make clean", the file "crc32table.h" will be deleted.
+Kbuild will assume files to be in the same relative directory as the
 Makefile, except if prefixed with $(objtree).
 
 To delete a directory hierarchy use:

Documentation/kernel-parameters.txt

@@ -2437,7 +2437,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 
 	nomca		[IA-64] Disable machine check abort handling
 
-	nomce		[X86-32] Machine Check Exception
+	nomce		[X86-32] Disable Machine Check Exception
 
 	nomfgpt		[X86-32] Disable Multi-Function General Purpose
 			Timer usage (for AMD Geode machines).

Documentation/laptops/.gitignore

 dslm
-freefall

Documentation/laptops/00-INDEX

@@ -8,8 +8,6 @@ disk-shock-protection.txt
 	- information on hard disk shock protection.
 dslm.c
 	- Simple Disk Sleep Monitor program
-freefall.c
-	- (HP/DELL) laptop accelerometer program for disk protection.
 laptop-mode.txt
 	- how to conserve battery power using laptop-mode.
 sony-laptop.txt

Documentation/laptops/Makefile

 # List of programs to build
-hostprogs-y := dslm freefall
+hostprogs-y := dslm
 
 # Tell kbuild to always build the programs
 always := $(hostprogs-y)

Documentation/magic-number.txt

@@ -116,7 +116,6 @@ COW_MAGIC             0x4f4f4f4d  cow_header_v1     arch/um/drivers/ubd_user.c
 I810_CARD_MAGIC       0x5072696E  i810_card         sound/oss/i810_audio.c
 TRIDENT_CARD_MAGIC    0x5072696E  trident_card      sound/oss/trident.c
 ROUTER_MAGIC          0x524d4157  wan_device        [in wanrouter.h pre 3.9]
-SCC_MAGIC             0x52696368  gs_port           drivers/char/scc.h
 SAVEKMSG_MAGIC1       0x53415645  savekmsg          arch/*/amiga/config.c
 GDA_MAGIC             0x58464552  gda               arch/mips/include/asm/sn/gda.h
 RED_MAGIC1            0x5a2cf071  (any)             mm/slab.c
@@ -138,7 +137,6 @@ KMALLOC_MAGIC         0x87654321  snd_alloc_track   sound/core/memory.c
 PWC_MAGIC             0x89DC10AB  pwc_device        drivers/usb/media/pwc.h
 NBD_REPLY_MAGIC       0x96744668  nbd_reply         include/linux/nbd.h
 ENI155_MAGIC          0xa54b872d  midway_eprom	    drivers/atm/eni.h
-SCI_MAGIC             0xbabeface  gs_port           drivers/char/sh-sci.h
 CODA_MAGIC            0xC0DAC0DA  coda_file_info    fs/coda/coda_fs_i.h
 DPMEM_MAGIC           0xc0ffee11  gdt_pci_sram      drivers/scsi/gdth.h
 YAM_MAGIC             0xF10A7654  yam_port          drivers/net/hamradio/yam.c

Documentation/networking/timestamping/txtimestamp.c

@@ -36,6 +36,7 @@
 #include <asm/types.h>
 #include <error.h>
 #include <errno.h>
+#include <inttypes.h>
 #include <linux/errqueue.h>
 #include <linux/if_ether.h>
 #include <linux/net_tstamp.h>
@@ -49,7 +50,6 @@
 #include <poll.h>
 #include <stdarg.h>
 #include <stdbool.h>
-#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -96,7 +96,7 @@ static void __print_timestamp(const char *name, struct timespec *cur,
 		prev_ms = (long) ts_prev.tv_sec * 1000 * 1000;
 		prev_ms += ts_prev.tv_nsec / 1000;
 
-		fprintf(stderr, "  (%+ld us)", cur_ms - prev_ms);
+		fprintf(stderr, "  (%+" PRId64 " us)", cur_ms - prev_ms);
 	}
 
 	ts_prev = *cur;

Documentation/nfc/nfc-hci.txt

@@ -122,7 +122,7 @@ This must be done from a context that can sleep.
 PHY Management
 --------------
 
-The physical link (i2c, ...) management is defined by the following struture:
+The physical link (i2c, ...) management is defined by the following structure:
 
 struct nfc_phy_ops {
 	int (*write)(void *dev_id, struct sk_buff *skb);

Documentation/stable_kernel_rules.txt

@@ -59,11 +59,20 @@ For all other submissions, choose one of the following procedures:
    changelog of your submission, as well as the kernel version you wish
    it to be applied to.
 
-Option 1 is probably the easiest and most common. Options 2 and 3 are more
-useful if the patch isn't deemed worthy at the time it is applied to a public
-git tree (for instance, because it deserves more regression testing first).
-Option 3 is especially useful if the patch needs some special handling to apply
-to an older kernel (e.g., if API's have changed in the meantime).
+Option 1 is *strongly* preferred, is the easiest and most common.  Options 2 and
+3 are more useful if the patch isn't deemed worthy at the time it is applied to
+a public git tree (for instance, because it deserves more regression testing
+first).  Option 3 is especially useful if the patch needs some special handling
+to apply to an older kernel (e.g., if API's have changed in the meantime).
+
+Note that for Option 3, if the patch deviates from the original upstream patch
+(for example because it had to be backported) this must be very clearly
+documented and justified in the patch description.
+
+The upstream commit ID must be specified with a separate line above the commit
+text, like this:
+
+    commit <sha1> upstream.
 
 Additionally, some patches submitted via Option 1 may have additional patch
 prerequisites which can be cherry-picked. This can be specified in the following

Documentation/trace/ftrace.txt

@@ -108,8 +108,8 @@ of ftrace. Here is a list of some of the key files:
 	data is read from this file, it is consumed, and
 	will not be read again with a sequential read. The
 	"trace" file is static, and if the tracer is not
-	adding more data,they will display the same
-	information every time they are read.
+	adding more data, it will display the same
+	information every time it is read.
 
   trace_options:
 

Documentation/usb/usb-serial.txt

@@ -465,12 +465,14 @@ Generic Serial driver
   device, and does not support any kind of device flow control. All that
   is required of your device is that it has at least one bulk in endpoint,
   or one bulk out endpoint. 
-  
-  To enable the generic driver to recognize your device, build the driver
-  as a module and load it by the following invocation:
+
+  To enable the generic driver to recognize your device, provide
+	echo <vid> <pid> >/sys/bus/usb-serial/drivers/generic/new_id
+  where the <vid> and <pid> is replaced with the hex representation of your
+  device's vendor id and product id.
+  If the driver is compiled as a module you can also provide one id when
+  loading the module
 	insmod usbserial vendor=0x#### product=0x####
-  where the #### is replaced with the hex representation of your device's
-  vendor id and product id.
 
   This driver has been successfully used to connect to the NetChip USB
   development board, providing a way to develop USB firmware without

Documentation/zh_CN/magic-number.txt

@@ -116,7 +116,6 @@ COW_MAGIC             0x4f4f4f4d  cow_header_v1     arch/um/drivers/ubd_user.c
 I810_CARD_MAGIC       0x5072696E  i810_card         sound/oss/i810_audio.c
 TRIDENT_CARD_MAGIC    0x5072696E  trident_card      sound/oss/trident.c
 ROUTER_MAGIC          0x524d4157  wan_device        [in wanrouter.h pre 3.9]
-SCC_MAGIC             0x52696368  gs_port           drivers/char/scc.h
 SAVEKMSG_MAGIC1       0x53415645  savekmsg          arch/*/amiga/config.c
 GDA_MAGIC             0x58464552  gda               arch/mips/include/asm/sn/gda.h
 RED_MAGIC1            0x5a2cf071  (any)             mm/slab.c
@@ -138,7 +137,6 @@ KMALLOC_MAGIC         0x87654321  snd_alloc_track   sound/core/memory.c
 PWC_MAGIC             0x89DC10AB  pwc_device        drivers/usb/media/pwc.h
 NBD_REPLY_MAGIC       0x96744668  nbd_reply         include/linux/nbd.h
 ENI155_MAGIC          0xa54b872d  midway_eprom	    drivers/atm/eni.h
-SCI_MAGIC             0xbabeface  gs_port           drivers/char/sh-sci.h
 CODA_MAGIC            0xC0DAC0DA  coda_file_info    include/linux/coda_fs_i.h
 DPMEM_MAGIC           0xc0ffee11  gdt_pci_sram      drivers/scsi/gdth.h
 YAM_MAGIC             0xF10A7654  yam_port          drivers/net/hamradio/yam.c

firmware/README.AddingFirmware

@@ -21,15 +21,25 @@ been permitted to redistribute under separate cover.
 
 To submit firmware to that repository, please send either a git binary
 diff or preferably a git pull request to:
-      David Woodhouse <dwmw2@infradead.org>
-      Ben Hutchings <ben@decadent.org.uk>
+      linux-firmware@kernel.org
+and also cc: to related mailing lists.
 
 Your commit should include an update to the WHENCE file clearly
 identifying the licence under which the firmware is available, and
 that it is redistributable. If the licence is long and involved, it's
 permitted to include it in a separate file and refer to it from the
 WHENCE file.
+And if it were possible, a changelog of the firmware itself.
 
 Ideally, your commit should contain a Signed-Off-By: from someone
 authoritative on the licensing of the firmware in question (i.e. from
 within the company that owns the code).
+
+
+WARNING:
+=======
+
+Don't send any "CONFIDENTIALITY STATEMENT" in your e-mail, patch or
+request. Otherwise your firmware _will never be accepted_.
+
+Maintainers are really busy, so don't expect a prompt reply.

tools/Makefile

@@ -18,6 +18,7 @@ help:
 	@echo '  vm         - misc vm tools'
 	@echo '  x86_energy_perf_policy - Intel energy policy tool'
 	@echo '  tmon       - thermal monitoring and tuning tool'
+	@echo '  freefall   - laptop accelerometer program for disk protection'
 	@echo ''
 	@echo 'You can do:'
 	@echo ' $$ make -C tools/ <tool>_install'
@@ -62,6 +63,9 @@ turbostat x86_energy_perf_policy: FORCE
 tmon: FORCE
 	$(call descend,thermal/$@)
 
+freefall: FORCE
+	$(call descend,laptop/$@)
+
 acpi_install:
 	$(call descend,power/$(@:_install=),install)
 
@@ -80,10 +84,13 @@ turbostat_install x86_energy_perf_policy_install:
 tmon_install:
 	$(call descend,thermal/$(@:_install=),install)
 
+freefall_install:
+	$(call descend,laptop/$(@:_install=),install)
+
 install: acpi_install cgroup_install cpupower_install hv_install firewire_install lguest_install \
 		perf_install selftests_install turbostat_install usb_install \
 		virtio_install vm_install net_install x86_energy_perf_policy_install \
-	tmon
+		tmon freefall_install
 
 acpi_clean:
 	$(call descend,power/acpi,clean)
@@ -112,8 +119,11 @@ turbostat_clean x86_energy_perf_policy_clean:
 tmon_clean:
 	$(call descend,thermal/tmon,clean)
 
+freefall_clean:
+	$(call descend,laptop/freefall,clean)
+
 clean: acpi_clean cgroup_clean cpupower_clean hv_clean firewire_clean lguest_clean \
 		perf_clean selftests_clean turbostat_clean usb_clean virtio_clean \
-		vm_clean net_clean x86_energy_perf_policy_clean tmon_clean
+		vm_clean net_clean x86_energy_perf_policy_clean tmon_clean freefall_clean
 
 .PHONY: FORCE

tools/laptop/freefall/Makefile

+PREFIX ?= /usr
+SBINDIR ?= sbin
+INSTALL ?= install
+CC = $(CROSS_COMPILE)gcc
+
+TARGET = freefall
+
+all: $(TARGET)
+
+%: %.c
+	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $<
+
+clean:
+	$(RM) $(TARGET)
+
+install: freefall
+	$(INSTALL) -D -m 755 $(TARGET) $(DESTDIR)$(PREFIX)/$(SBINDIR)/$(TARGET)