This series attempts to make the fsgsbase test in the x86 kselftest report a stable result. On some Intel systems there are intermittent failures in this testcase which have been reported and discussed previously with the initial report and last meaningful discussion having been about a year ago:
https://lore.kernel.org/lkml/20180126153631.ha7yc33fj5uhitjo@xps/
with the analysis concluding that this is a hardware issue affecting a subset of systems but no fix has been merged as yet. In order to at least make the test more solid for use in automated testing this series modifies it to execute the test often enough to reproduce the problem reliably, at least for the systems I have access to.
Mark Brown (2): selftests/x86/fsgsbase: Indirect output through a wrapper function selftests/x86/fsgsbase: Default to trying to run the test repeatedly
tools/testing/selftests/x86/fsgsbase.c | 79 +++++++++++++++++++------- 1 file changed, 58 insertions(+), 21 deletions(-)