linux-kernel - Re: [PATCH v8 0/3] mm/hmm/test: add self tests for HMM

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Message-ID: <20200415144125.GU11945@mellanox.com>
Date:   Wed, 15 Apr 2020 11:41:25 -0300
From:   Jason Gunthorpe <jgg@...lanox.com>
To:     Ralph Campbell <rcampbell@...dia.com>
Cc:     Jerome Glisse <jglisse@...hat.com>,
        John Hubbard <jhubbard@...dia.com>,
        Christoph Hellwig <hch@....de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Shuah Khan <shuah@...nel.org>, linux-rdma@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v8 0/3] mm/hmm/test: add self tests for HMM

On Fri, Mar 20, 2020 at 05:31:05PM -0700, Ralph Campbell wrote:
> This series adds basic self tests for HMM and are intended for Jason
> Gunthorpe's rdma tree which has a number of HMM patches applied.

Here are some hunks I noticed while testing this:

--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -2201,7 +2201,8 @@ config TEST_MEMINIT
 
 config TEST_HMM
 	tristate "Test HMM (Heterogeneous Memory Management)"
-	depends on DEVICE_PRIVATE
+	depends on TRANSPARENT_HUGEPAGE
+	select DEVICE_PRIVATE
 	select HMM_MIRROR
 	select MMU_NOTIFIER
 	help

It fails testing if TRANSPARENT_HUGEPAGE is not on

@@ -1097,6 +1071,7 @@ static int dmirror_device_init(struct dmirror_device *mdevice, int id)
 	spin_lock_init(&mdevice->lock);
 
 	cdev_init(&mdevice->cdevice, &dmirror_fops);
+	mdevice->cdevice.owner = THIS_MODULE;
 	ret = cdev_add(&mdevice->cdevice, dev, 1);
 	if (ret)
 		return ret;

The use of cdev without a struct device is super weird, but it still
needs this

diff --git a/tools/testing/selftests/vm/test_hmm.sh b/tools/testing/selftests/vm/test_hmm.sh
index 461e4a99a362cf..0647b525a62564 100755
--- a/tools/testing/selftests/vm/test_hmm.sh
+++ b/tools/testing/selftests/vm/test_hmm.sh
@@ -59,7 +59,7 @@ run_smoke()
 	echo "Running smoke test. Note, this test provides basic coverage."
 
 	load_driver
-	./hmm-tests
+	$(dirname "${BASH_SOURCE[0]}")/hmm-tests
 	unload_driver
 }

Make it runnably reliably

Jason