tree 389b9c29eaaa7eb49a9e7d3bb601959fb9d27af8
parent c0a18111e571138747a98af18b3a2124df56a0d1
author Martin Schwidefsky <schwidefsky@de.ibm.com> 1210144972 +0200
committer Martin Schwidefsky <schwidefsky@de.ibm.com> 1210144980 +0200

[S390] s390: Optimize user and work TIF check

On return from syscall or interrupt, we have to check if we return to
userspace (likely) and if there is work todo (less likely) to decide
if we handle the work. We can optimize this check: we first check for
the less likely work case and then check for userspace.

This patch is also a preparation for an additional patch, that fixes a bug
in KVM dealing with cpu bound guests.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>