Ingo Molnar 2aba73a614
Merge tag 'pr-20141223-x86-vdso' of git://git.kernel.org/pub/scm/linux/kernel/git/luto/linux into x86/urgent ...
Pull VDSO fix from Andy Lutomirski:
"This is hopefully the last vdso fix for 3.19. It should be very
safe (it just adds a volatile).
I don't think it fixes an actual bug (the __getcpu calls in the
pvclock code may not have been needed in the first place), but
discussion on that point is ongoing.
It also fixes a big performance issue in 3.18 and earlier in which
the lsl instructions in vclock_gettime got hoisted so far up the
function that they happened even when the function they were in was
never called. n 3.19, the performance issue seems to be gone due to
the whims of my compiler and some interaction with a branch that's
now gone.
I'll hopefully have a much bigger overhaul of the pvclock code
for 3.20, but it needs careful review."
Signed-off-by: Ingo Molnar <mingo@kernel.org >
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2aba73a614