+ lib-test_vmallocc-add-vm_map_ram-vm_unmap_ram-test-case.patch added to mm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: lib/test_vmalloc.c: add vm_map_ram()/vm_unmap_ram() test case
has been added to the -mm mm-unstable branch.  Its filename is
     lib-test_vmallocc-add-vm_map_ram-vm_unmap_ram-test-case.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/lib-test_vmallocc-add-vm_map_ram-vm_unmap_ram-test-case.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: "Uladzislau Rezki (Sony)" <urezki@gmail.com>
Subject: lib/test_vmalloc.c: add vm_map_ram()/vm_unmap_ram() test case
Date: Thu, 30 Mar 2023 21:06:39 +0200

Add vm_map_ram()/vm_unmap_ram() test case to our stress test-suite.

Link: https://lkml.kernel.org/r/20230330190639.431589-2-urezki@gmail.com
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Lorenzo Stoakes <lstoakes@gmail.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Oleksiy Avramchenko <oleksiy.avramchenko@sony.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 lib/test_vmalloc.c |   37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

--- a/lib/test_vmalloc.c~lib-test_vmallocc-add-vm_map_ram-vm_unmap_ram-test-case
+++ a/lib/test_vmalloc.c
@@ -53,6 +53,7 @@ __param(int, run_test_mask, INT_MAX,
 		"\t\tid: 128,  name: pcpu_alloc_test\n"
 		"\t\tid: 256,  name: kvfree_rcu_1_arg_vmalloc_test\n"
 		"\t\tid: 512,  name: kvfree_rcu_2_arg_vmalloc_test\n"
+		"\t\tid: 1024, name: vm_map_ram_test\n"
 		/* Add a new test case description here. */
 );
 
@@ -358,6 +359,41 @@ kvfree_rcu_2_arg_vmalloc_test(void)
 	return 0;
 }
 
+static int
+vm_map_ram_test(void)
+{
+	unsigned long nr_allocated;
+	unsigned int map_nr_pages;
+	unsigned char *v_ptr;
+	struct page **pages;
+	int i;
+
+	map_nr_pages = nr_pages > 0 ? nr_pages:1;
+	pages = kmalloc(map_nr_pages * sizeof(struct page), GFP_KERNEL);
+	if (!pages)
+		return -1;
+
+	nr_allocated = alloc_pages_bulk_array(GFP_KERNEL, map_nr_pages, pages);
+	if (nr_allocated != map_nr_pages)
+        goto cleanup;
+
+	/* Run the test loop. */
+	for (i = 0; i < test_loop_count; i++) {
+		v_ptr = vm_map_ram(pages, map_nr_pages, NUMA_NO_NODE);
+		*v_ptr = 'a';
+		vm_unmap_ram(v_ptr, map_nr_pages);
+	}
+
+cleanup:
+	for (i = 0; i < nr_allocated; i++)
+		__free_page(pages[i]);
+
+	kfree(pages);
+
+	/* 0 indicates success. */
+	return nr_allocated != map_nr_pages;
+}
+
 struct test_case_desc {
 	const char *test_name;
 	int (*test_func)(void);
@@ -374,6 +410,7 @@ static struct test_case_desc test_case_a
 	{ "pcpu_alloc_test", pcpu_alloc_test },
 	{ "kvfree_rcu_1_arg_vmalloc_test", kvfree_rcu_1_arg_vmalloc_test },
 	{ "kvfree_rcu_2_arg_vmalloc_test", kvfree_rcu_2_arg_vmalloc_test },
+	{ "vm_map_ram_test", vm_map_ram_test },
 	/* Add a new test case here. */
 };
 
_

Patches currently in -mm which might be from urezki@gmail.com are

mm-vmalloc-remove-a-global-vmap_blocks-xarray.patch
lib-test_vmallocc-add-vm_map_ram-vm_unmap_ram-test-case.patch