add dts config

hc

2023-12-06 08f87f769b595151be1afeff53e144f543faa614

 kernel/tools/testing/scatterlist/main.c
..
..
@@ -5,6 +5,15 @@
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5
 
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 #define MAX_PAGES (64)
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+struct test {
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+	int alloc_ret;
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+	unsigned num_pages;
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+	unsigned *pfn;
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+	unsigned size;
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+	unsigned int max_seg;
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+	unsigned int expected_segments;
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+};
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+
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 static void set_pages(struct page **pages, const unsigned *array, unsigned num)
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 {
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 	unsigned int i;
..
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@@ -17,20 +26,35 @@
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 #define pfn(...) (unsigned []){ __VA_ARGS__ }
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+static void fail(struct test *test, struct sg_table *st, const char *cond)
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+{
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+	unsigned int i;
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+
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+	fprintf(stderr, "Failed on '%s'!\n\n", cond);
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+
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+	printf("size = %u, max segment = %u, expected nents = %u\nst->nents = %u, st->orig_nents= %u\n",
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+	       test->size, test->max_seg, test->expected_segments, st->nents,
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+	       st->orig_nents);
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+
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+	printf("%u input PFNs:", test->num_pages);
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+	for (i = 0; i < test->num_pages; i++)
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+		printf(" %x", test->pfn[i]);
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+	printf("\n");
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+
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+	exit(1);
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+}
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+
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+#define VALIDATE(cond, st, test) \
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+	if (!(cond)) \
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+		fail((test), (st), #cond);
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+
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 int main(void)
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 {
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 	const unsigned int sgmax = SCATTERLIST_MAX_SEGMENT;
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-	struct test {
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-		int alloc_ret;
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-		unsigned num_pages;
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-		unsigned *pfn;
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-		unsigned size;
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-		unsigned int max_seg;
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-		unsigned int expected_segments;
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-	} *test, tests[] = {
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-		{ -EINVAL, 1, pfn(0), PAGE_SIZE, PAGE_SIZE + 1, 1 },
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+	struct test *test, tests[] = {
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 		{ -EINVAL, 1, pfn(0), PAGE_SIZE, 0, 1 },
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-		{ -EINVAL, 1, pfn(0), PAGE_SIZE, sgmax + 1, 1 },
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+		{ 0, 1, pfn(0), PAGE_SIZE, PAGE_SIZE + 1, 1 },
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+		{ 0, 1, pfn(0), PAGE_SIZE, sgmax + 1, 1 },
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 		{ 0, 1, pfn(0), PAGE_SIZE, sgmax, 1 },
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 		{ 0, 1, pfn(0), 1, sgmax, 1 },
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 		{ 0, 2, pfn(0, 1), 2 * PAGE_SIZE, sgmax, 1 },
..
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@@ -55,20 +79,19 @@
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 	for (i = 0, test = tests; test->expected_segments; test++, i++) {
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 		struct page *pages[MAX_PAGES];
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 		struct sg_table st;
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-		int ret;
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+		struct scatterlist *sg;
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 		set_pages(pages, test->pfn, test->num_pages);
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-		ret = __sg_alloc_table_from_pages(&st, pages, test->num_pages,
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-						  0, test->size, test->max_seg,
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-						  GFP_KERNEL);
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-		assert(ret == test->alloc_ret);
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+		sg = __sg_alloc_table_from_pages(&st, pages, test->num_pages, 0,
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+				test->size, test->max_seg, NULL, 0, GFP_KERNEL);
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+		assert(PTR_ERR_OR_ZERO(sg) == test->alloc_ret);
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 		if (test->alloc_ret)
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 			continue;
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-		assert(st.nents == test->expected_segments);
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-		assert(st.orig_nents == test->expected_segments);
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+		VALIDATE(st.nents == test->expected_segments, &st, test);
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+		VALIDATE(st.orig_nents == test->expected_segments, &st, test);
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 		sg_free_table(&st);
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 	}