From: David Hildenbrand <david@redhat.com>
To: Thomas Huth <thuth@redhat.com>,
Janosch Frank <frankja@linux.ibm.com>,
kvm@vger.kernel.org
Cc: linux-s390@vger.kernel.org
Subject: Re: [kvm-unit-tests PATCH v3 6/6] s390x: SMP test
Date: Wed, 25 Sep 2019 15:32:40 +0200 [thread overview]
Message-ID: <4afbfdca-e028-4bb8-0ed0-41f907e9acf3@redhat.com> (raw)
In-Reply-To: <df219ca6-b772-cfcb-2c9b-e53fe5b2c8b8@redhat.com>
On 25.09.19 15:30, Thomas Huth wrote:
> On 25/09/2019 15.27, David Hildenbrand wrote:
>> On 20.09.19 10:03, Janosch Frank wrote:
>>> Testing SIGP emulation for the following order codes:
>>> * start
>>> * stop
>>> * restart
>>> * set prefix
>>> * store status
>>> * stop and store status
>>> * reset
>>> * initial reset
>>> * external call
>>> * emegergency call
>>>
>>> restart and set prefix are part of the library and needed to start
>>> other cpus.
>>>
>>> Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
>>> ---
>>> s390x/Makefile | 1 +
>>> s390x/smp.c | 242 ++++++++++++++++++++++++++++++++++++++++++++
>>> s390x/unittests.cfg | 4 +
>>> 3 files changed, 247 insertions(+)
>>> create mode 100644 s390x/smp.c
>>>
>>> diff --git a/s390x/Makefile b/s390x/Makefile
>>> index d83dd0b..3744372 100644
>>> --- a/s390x/Makefile
>>> +++ b/s390x/Makefile
>>> @@ -15,6 +15,7 @@ tests += $(TEST_DIR)/cpumodel.elf
>>> tests += $(TEST_DIR)/diag288.elf
>>> tests += $(TEST_DIR)/stsi.elf
>>> tests += $(TEST_DIR)/skrf.elf
>>> +tests += $(TEST_DIR)/smp.elf
>>> tests_binary = $(patsubst %.elf,%.bin,$(tests))
>>>
>>> all: directories test_cases test_cases_binary
>>> diff --git a/s390x/smp.c b/s390x/smp.c
>>> new file mode 100644
>>> index 0000000..7032494
>>> --- /dev/null
>>> +++ b/s390x/smp.c
>>> @@ -0,0 +1,242 @@
>>> +/*
>>> + * Tests sigp emulation
>>> + *
>>> + * Copyright 2019 IBM Corp.
>>> + *
>>> + * Authors:
>>> + * Janosch Frank <frankja@linux.ibm.com>
>>> + *
>>> + * This code is free software; you can redistribute it and/or modify it
>>> + * under the terms of the GNU General Public License version 2.
>>> + */
>>> +#include <libcflat.h>
>>> +#include <asm/asm-offsets.h>
>>> +#include <asm/interrupt.h>
>>> +#include <asm/page.h>
>>> +#include <asm/facility.h>
>>> +#include <asm-generic/barrier.h>
>>> +#include <asm/sigp.h>
>>> +
>>> +#include <smp.h>
>>> +#include <alloc_page.h>
>>> +
>>> +static int testflag = 0;
>>> +
>>> +static void cpu_loop(void)
>>> +{
>>> + for (;;) {}
>>
>> Won't that be optimized out completely?
>
> Why? AFAIK this is the standard way to write and endless loop ... how
> can a compiler optimize that away?
Was messing it up with "just" an empty loop body, I think you're right.
--
Thanks,
David / dhildenb
next prev parent reply other threads:[~2019-09-25 13:32 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-20 8:03 [kvm-unit-tests PATCH v3 0/6] s390x: Add multiboot and smp Janosch Frank
2019-09-20 8:03 ` [kvm-unit-tests PATCH v3 1/6] s390x: Use interrupts in SCLP and add locking Janosch Frank
2019-09-20 8:12 ` David Hildenbrand
2019-09-20 8:03 ` [kvm-unit-tests PATCH v3 2/6] s390x: Add linemode console Janosch Frank
2019-09-20 8:03 ` [kvm-unit-tests PATCH v3 3/6] s390x: Add linemode buffer to fix newline on every print Janosch Frank
2019-09-20 8:24 ` David Hildenbrand
2019-09-20 8:31 ` Janosch Frank
2019-09-20 11:23 ` [kvm-unit-tests PATCH] " Janosch Frank
2019-09-20 8:03 ` [kvm-unit-tests PATCH v3 4/6] s390x: Add initial smp code Janosch Frank
2019-09-23 10:43 ` Thomas Huth
2019-09-23 14:15 ` [kvm-unit-tests PATCH] " Janosch Frank
2019-09-24 16:06 ` Thomas Huth
2019-09-20 8:03 ` [kvm-unit-tests PATCH v3 5/6] s390x: Prepare for external calls Janosch Frank
2019-09-25 8:50 ` David Hildenbrand
2019-09-20 8:03 ` [kvm-unit-tests PATCH v3 6/6] s390x: SMP test Janosch Frank
2019-09-25 8:49 ` Thomas Huth
2019-09-25 10:26 ` Janosch Frank
2019-09-25 9:03 ` David Hildenbrand
2019-09-25 10:24 ` Janosch Frank
2019-09-25 13:27 ` David Hildenbrand
2019-09-25 13:30 ` Thomas Huth
2019-09-25 13:32 ` David Hildenbrand [this message]
2019-09-25 13:35 ` David Hildenbrand
2019-09-25 13:39 ` David Hildenbrand
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