linux-kernel - Re: [PATCH -next v5 2/4] selftests/memory-hotplug: Restore memory before exit

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Date:   Sat, 8 Oct 2022 01:40:55 +0000
From:   zhaogongyi <zhaogongyi@...wei.com>
To:     David Hildenbrand <david@...hat.com>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>
CC:     "akinobu.mita@...il.com" <akinobu.mita@...il.com>,
        "corbet@....net" <corbet@....net>,
        "osalvador@...e.de" <osalvador@...e.de>,
        "shuah@...nel.org" <shuah@...nel.org>
Subject: Re: [PATCH -next v5 2/4] selftests/memory-hotplug: Restore memory
 before exit

Hi!

> 
> On 30.09.22 10:52, zhaogongyi wrote:
> > Hi!
> >
> >>
> >> On 30.09.22 08:35, Zhao Gongyi wrote:
> >>> Some momory will be left in offline state when calling
> >>> offline_memory_expect_fail() failed. Restore it before exit.
> >>>
> >>> Signed-off-by: Zhao Gongyi <zhaogongyi@...wei.com>
> >>> ---
> >>>    .../memory-hotplug/mem-on-off-test.sh         | 21
> >> ++++++++++++++-----
> >>>    1 file changed, 16 insertions(+), 5 deletions(-)
> >>>
> >>> diff --git a/tools/testing/selftests/memory-hotplug/mem-on-off-test.sh
> >> b/tools/testing/selftests/memory-hotplug/mem-on-off-test.sh
> >>> index 1d87611a7d52..91a7457616bb 100755
> >>> --- a/tools/testing/selftests/memory-hotplug/mem-on-off-test.sh
> >>> +++ b/tools/testing/selftests/memory-hotplug/mem-on-off-test.sh
> >>> @@ -134,6 +134,16 @@ offline_memory_expect_fail()
> >>>    	return 0
> >>>    }
> >>>
> >>> +online_all_offline_memory()
> >>> +{
> >>> +	for memory in `hotpluggable_offline_memory`; do
> >>> +		if ! online_memory_expect_success $memory; then
> >>> +			echo "$FUNCNAME $memory: unexpected fail" >&2
> >>
> >> Do we need that output?
> >
> > In my opinion, if online a memory node failed ,it should be a kernel bug
> catched, so, I think the output here is needed.
> 
> But online_memory_expect_success() already prints a warning, no?

Yes, online_memory_expect_success() already prints a warning, remove the warning in online_all_offline_memory() seems ok,

My previous consideration was that one more log information would make it easier to locate the wrong location.

Best Regards,
Gongyi