Salman Qazi ee9c2e08d3 sched/x86: Fix overflow in cyc2ns_offset ... commit 9993bc635d upstream. When a machine boots up, the TSC generally gets reset. However, when kexec is used to boot into a kernel, the TSC value would be carried over from the previous kernel. The computation of cycns_offset in set_cyc2ns_scale is prone to an overflow, if the machine has been up more than 208 days prior to the kexec. The overflow happens when we multiply *scale, even though there is enough room to store the final answer. We fix this issue by decomposing tsc_now into the quotient and remainder of division by CYC2NS_SCALE_FACTOR and then performing the multiplication separately on the two components. Refactor code to share the calculation with the previous fix in __cycles_2_ns(). Signed-off-by: Salman Qazi <sqazi@google.com> Acked-by: John Stultz <john.stultz@linaro.org> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Turner <pjt@google.com> Cc: john stultz <johnstul@us.ibm.com> Link: http://lkml.kernel.org/r/20120310004027.19291.88460.stgit@dungbeetle.mtv.corp.google.com Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: Mike Galbraith <efault@gmx.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2012-04-13 08:14:08 -07:00
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acpi	ACPI: Store SRAT table revision	2012-01-25 17:24:57 -08:00
asm-generic	compat: use sys_sendfile64() implementation for sendfile syscall	2012-04-02 09:27:21 -07:00
crypto
drm	drm: Fix authentication kernel crash	2012-02-03 09:18:52 -08:00
keys
linux	sched/x86: Fix overflow in cyc2ns_offset	2012-04-13 08:14:08 -07:00
math-emu
media	[media] tuner-core/v4l2-subdev: document that the type field has to be filled in	2011-07-07 15:04:23 -03:00
mtd
net	ipv4: reset flowi parameters on route connect	2012-02-29 16:34:03 -08:00
pcmcia	pcmcia: Make declaration and uses of struct pcmcia_device_id const	2011-05-06 07:46:15 +02:00
rdma	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband	2011-05-26 12:13:57 -07:00
rxrpc
scsi	[SCSI] libsas: Add option for SATA soft reset	2011-05-26 22:49:33 -05:00
sound	ALSA: sb16 - Fix build errors on MIPS and others with 13bit ioctl size	2011-06-30 15:33:57 +02:00
target	target: Set additional sense length field in sense data	2012-01-25 17:25:00 -08:00
trace	writeback: fix dereferencing NULL bdi->dev on trace_writeback_queue	2012-02-20 12:48:11 -08:00
video	OMAPDSS: HDMI: PHY burnout fix	2012-03-12 10:32:59 -07:00
xen	xen/xenbus: Reject replies with payload > XENSTORE_PAYLOAD_MAX.	2012-01-25 17:24:41 -08:00
Kbuild