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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2018-04-27 07:36:55 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-04-29 07:50:03 +0200 |
| commit | bbf89d7832ed4b94b7d689165f90dc38bba350ca (patch) | |
| tree | 7e79bad6f23886f7d279874ec23c6f5079db6bef /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | f3303788c0514ef43151b7272c7309740ed88dc8 (diff) | |
s390: do not bypass BPENTER for interrupt system calls
[ Upstream commit d5feec04fe578c8dbd9e2e1439afc2f0af761ed4 ]
The system call path can be interrupted before the switch back to the
standard branch prediction with BPENTER has been done. The critical
section cleanup code skips forward to .Lsysc_do_svc and bypasses the
BPENTER. In this case the kernel and all subsequent code will run with
the limited branch prediction.
Fixes: eacf67eb9b32 ("s390: run user space and KVM guests with modified branch prediction")
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions