+ hmm-test-remove-unused-dmirror_zero_page.patch added to -mm tree

[akpm@linux-foundation.org]

The patch titled
     Subject: lib/test_hmm.c: remove unused dmirror_zero_page
has been added to the -mm tree.  Its filename is
     hmm-test-remove-unused-dmirror_zero_page.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/hmm-test-remove-unused-dmirror_zero_page.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/hmm-test-remove-unused-dmirror_zero_page.patch

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------------------------------------------------------
From: Ralph Campbell <rcampbell@nvidia.com>
Subject: lib/test_hmm.c: remove unused dmirror_zero_page

The variable dmirror_zero_page is unused in the HMM self test driver which
was probably intended to demonstrate how a driver could use
migrate_vma_setup() to share a single read-only device private zero page
similar to how the CPU does.  However, this isn't needed for the self
tests so remove it.

Link: https://lkml.kernel.org/r/20200914213801.16520-1-rcampbell@nvidia.com
Signed-off-by: Ralph Campbell <rcampbell@nvidia.com>
Cc: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 lib/test_hmm.c |   14 --------------
 1 file changed, 14 deletions(-)

--- a/lib/test_hmm.c~hmm-test-remove-unused-dmirror_zero_page
+++ a/lib/test_hmm.c
@@ -36,7 +36,6 @@
 static const struct dev_pagemap_ops dmirror_devmem_ops;
 static const struct mmu_interval_notifier_ops dmirror_min_ops;
 static dev_t dmirror_dev;
-static struct page *dmirror_zero_page;
 
 struct dmirror_device;
 
@@ -1127,17 +1126,6 @@ static int __init hmm_dmirror_init(void)
 			goto err_chrdev;
 	}
 
-	/*
-	 * Allocate a zero page to simulate a reserved page of device private
-	 * memory which is always zero. The zero_pfn page isn't used just to
-	 * make the code here simpler (i.e., we need a struct page for it).
-	 */
-	dmirror_zero_page = alloc_page(GFP_HIGHUSER | __GFP_ZERO);
-	if (!dmirror_zero_page) {
-		ret = -ENOMEM;
-		goto err_chrdev;
-	}
-
 	pr_info("HMM test module loaded. This is only for testing HMM.\n");
 	return 0;
 
@@ -1153,8 +1141,6 @@ static void __exit hmm_dmirror_exit(void
 {
 	int id;
 
-	if (dmirror_zero_page)
-		__free_page(dmirror_zero_page);
 	for (id = 0; id < DMIRROR_NDEVICES; id++)
 		dmirror_device_remove(dmirror_devices + id);
 	unregister_chrdev_region(dmirror_dev, DMIRROR_NDEVICES);
_

Patches currently in -mm which might be from rcampbell@nvidia.com are

mm-thp-fix-__split_huge_pmd_locked-for-migration-pmd.patch
mm-test-use-the-new-skip-macro.patch
hmm-test-remove-unused-dmirror_zero_page.patch
mm-migrate-remove-cpages-in-migrate_vma_finalize.patch
mm-migrate-remove-obsolete-comment-about-device-public.patch