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From 6694afe31dd67d186199a58d2252be5ea3472692 Mon Sep 17 00:00:00 2001
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From: Dan Williams <dan.j.williams@intel.com>
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Date: Tue, 12 Jan 2021 23:15:09 -0800
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Subject: [PATCH 005/217] ndctl/test: Fix device-dax mremap() test
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The test_dax_remap() test is a regression check for mishandling of mremap()
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in the presence of pmd_devmap(). My understanding is that it was a fuzzing
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condition not something an application would want to do in practice.
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On recent kernels with commit 73d5e0629919 ("mremap: check if it's possible
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to split original vma"), the test fails for device-dax. That seems an
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equally acceptable result of attempting this remap, so update the test
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rather than ask the kernel to preserve the old behaviour.
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Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
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Link: https://lore.kernel.org/r/161052210936.1804207.17896246772670985157.stgit@dwillia2-desk3.amr.corp.intel.com
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---
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test/dax-pmd.c | 5 +++++
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1 file changed, 5 insertions(+)
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diff --git a/test/dax-pmd.c b/test/dax-pmd.c
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index b1251db..7648e34 100644
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--- a/test/dax-pmd.c
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+++ b/test/dax-pmd.c
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@@ -69,6 +69,11 @@ int test_dax_remap(struct ndctl_test *test, int dax_fd, unsigned long align, voi
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remap = mremap(addr, REMAP_SIZE, REMAP_SIZE, MREMAP_MAYMOVE|MREMAP_FIXED, anon);
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+ if (remap == MAP_FAILED) {
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+ fprintf(stderr, "%s: mremap failed, that's ok too\n", __func__);
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+ return 0;
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+ }
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+
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if (remap != anon) {
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rc = -ENXIO;
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perror("mremap");
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--
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2.27.0
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