x86: kvm: Revert "remove sched notifier for cross-cpu migrations"

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The following point:

    2. per-CPU pvclock time info is updated if the
       underlying CPU changes.

Is not true anymore since "KVM: x86: update pvclock area conditionally,
on cpu migration".

Add task migration notification back.

Problem noticed by Andy Lutomirski.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
CC: stable@kernel.org # 3.11+

...

This commit is contained in:

Marcelo Tosatti 2015-03-23 20:21:51 -03:00

parent 58d2930f4e

commit 0a4e6be9ca

5 changed files with 76 additions and 8 deletions

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1

arch/x86/include/asm/pvclock.h

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44

arch/x86/kernel/pvclock.c

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16

arch/x86/vdso/vclock_gettime.c

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8

include/linux/sched.h

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15

kernel/sched/core.c

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