Thomas Gleixner 4c3711d7fb timekeeping: Provide NMI safe access to clock realtime ... The configurable printk timestamping wants access to clock realtime. Right now there is no ktime_get_real_fast_ns() accessor because reading the monotonic base and the realtime offset cannot be done atomically. Contrary to boot time this offset can change during runtime and cause half updated readouts. struct tk_read_base was fully packed when the fast timekeeper access was implemented. commit ceea5e3771 ("time: Fix clock->read(clock) race around clocksource changes") removed the 'read' function pointer from the structure, but of course left the comment stale. So now the structure can fit a new 64bit member w/o violating the cache line constraints. Add real_base to tk_read_base and update it in the fast timekeeper update sequence. Implement an accessor which follows the same scheme as the accessor to clock monotonic, but uses the new real_base to access clock real time. The runtime overhead for updating real_base is minimal as it just adds two cache hot values and stores them into an already dirtied cache line along with the other fast timekeeper updates. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Prarit Bhargava <prarit@redhat.com> Cc: John Stultz <john.stultz@linaro.org> Cc: Peter Zijlstra <peterz@infradead,org> Link: https://lkml.kernel.org/r/1505757060-2004-3-git-send-email-prarit@redhat.com		2017-09-25 21:05:59 +02:00
..
acpi	ACPI / bus: Make ACPI_HANDLE() work for non-GPL code again	2017-09-19 22:42:31 +02:00
asm-generic	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-09-14 20:01:41 -07:00
clocksource
crypto
drm	lib/interval_tree: fast overlap detection	2017-09-08 18:26:49 -07:00
dt-bindings	Merge branch '4.14-features' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus	2017-09-15 20:43:33 -07:00
keys	net: rxrpc: Replace time_t type with time64_t type	2017-08-29 10:16:00 +01:00
kvm
linux	timekeeping: Provide NMI safe access to clock realtime	2017-09-25 21:05:59 +02:00
math-emu
media	media updates for v4.14-rc1	2017-09-07 12:53:14 -07:00
memory
misc
net	net: prevent dst uses after free	2017-09-21 20:42:15 -07:00
pcmcia
ras
rdma	More RDMA work and some op-structure constification from Chuck Lever,	2017-09-09 13:31:49 -07:00
scsi	SCSI misc on 20170913	2017-09-13 10:47:14 -07:00
soc	ARM: SoC driver updates for v4.14	2017-09-10 20:40:00 -07:00
sound	sound updates for 4.14-rc1	2017-09-07 12:44:53 -07:00
target
trace	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2017-09-16 11:28:59 -07:00
uapi	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2017-09-23 05:41:27 -10:00
video
xen	xen, arm64: drop dummy lookup_address()	2017-09-19 09:25:05 -04:00