perf/x86/intel/rapl: Make package handling more robust

The package management code in RAPL relies on package mapping being
available before a CPU is started. This changed with:

  9d85eb9119f4 ("x86/smpboot: Make logical package management more robust")

because the ACPI/BIOS information turned out to be unreliable, but that
left RAPL in broken state. This was not noticed because on a regular boot
all CPUs are online before RAPL is initialized.

A possible fix would be to reintroduce the mess which allocates a package
data structure in CPU prepare and when it turns out to already exist in
starting throw it away later in the CPU online callback. But that's a
horrible hack and not required at all because RAPL becomes functional for
perf only in the CPU online callback. That's correct because user space is
not yet informed about the CPU being onlined, so nothing caan rely on RAPL
being available on that particular CPU.

Move the allocation to the CPU online callback and simplify the hotplug
handling. At this point the package mapping is established and correct.

This also adds a missing check for available package data in the
event_init() function.

Reported-by: Yasuaki Ishimatsu <yasu.isimatu@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sebastian Siewior <bigeasy@linutronix.de>
Cc: Stephane Eranian <eranian@google.com>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Fixes: 9d85eb9119f4 ("x86/smpboot: Make logical package management more robust")
Link: http://lkml.kernel.org/r/20170131230141.212593966@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>

path: root/net/nfc/nci/Kconfig

config NFC_NCI
	depends on NFC
	tristate "NCI protocol support"
	default n
	help
	  NCI (NFC Controller Interface) is a communication protocol between
	  an NFC Controller (NFCC) and a Device Host (DH).

	  Say Y here to compile NCI support into the kernel or say M to
	  compile it as module (nci).

config NFC_NCI_SPI
	depends on NFC_NCI && SPI
	select CRC_CCITT
	tristate "NCI over SPI protocol support"
	default n
	help
	  NCI (NFC Controller Interface) is a communication protocol between
	  an NFC Controller (NFCC) and a Device Host (DH).

	  Say yes if you use an NCI driver that requires SPI link layer.

config NFC_NCI_UART
	depends on NFC_NCI && TTY
	tristate "NCI over UART protocol support"
	default n
	help
	  Say yes if you use an NCI driver that requires UART link layer.