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s390/vdso: reimplement getcpu vdso syscall

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Implement the previously removed getcpu vdso syscall by using the
TOD programmable field to pass the cpu number to user space.

Reviewed-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2020-11-16 08:06:41 +01:00
commit 80f0630624
8 changed files with 42 additions and 2 deletions
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