From: Athira Rajeev atrajeev@linux.vnet.ibm.com
stable inclusion from stable-5.10.52 commit b7f4423c7de87893ce5f4e9ca559ad50f9986e4c bugzilla: 175542 https://gitee.com/openeuler/kernel/issues/I4DTKU
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit 45677c9aebe926192e59475b35a1ff35ff2d4217 ]
The "no_handler_test" in ebb selftests attempts to read the PMU registers twice via helper function "dump_ebb_state". First dump is just before closing of event and the second invocation is done after closing of the event. The original intention of second dump_ebb_state was to dump the state of registers at the end of the test when the counters are frozen. But this will be achieved with the first call itself since sample period is set to low value and PMU will be frozen by then. Hence patch removes the dump which was done before closing of the event.
Reported-by: Shirisha Ganta shirisha.ganta1@ibm.com Signed-off-by: Athira Rajeev atrajeev@linux.vnet.ibm.com Tested-by: Nageswara R Sastry <rnsastry@linux.ibm.com mailto:rnsastry@linux.ibm.com> Signed-off-by: Michael Ellerman mpe@ellerman.id.au Link: https://lore.kernel.org/r/1621950703-1532-2-git-send-email-atrajeev@linux.vn... Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Chen Jun chenjun102@huawei.com Acked-by: Weilong Chen chenweilong@huawei.com Signed-off-by: Chen Jun chenjun102@huawei.com --- tools/testing/selftests/powerpc/pmu/ebb/no_handler_test.c | 2 -- 1 file changed, 2 deletions(-)
diff --git a/tools/testing/selftests/powerpc/pmu/ebb/no_handler_test.c b/tools/testing/selftests/powerpc/pmu/ebb/no_handler_test.c index fc5bf4870d8e..01e827c31169 100644 --- a/tools/testing/selftests/powerpc/pmu/ebb/no_handler_test.c +++ b/tools/testing/selftests/powerpc/pmu/ebb/no_handler_test.c @@ -50,8 +50,6 @@ static int no_handler_test(void)
event_close(&event);
- dump_ebb_state(); - /* The real test is that we never took an EBB at 0x0 */
return 0;