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linux-7.2.3/tools/testing/selftests/riscv/mm/.gitignore

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+mmap_bottomup
+mmap_default

linux-7.2.3/tools/testing/selftests/riscv/mm/Makefile

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+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2021 ARM Limited
+# Originally tools/testing/arm64/abi/Makefile
+
+# Additional include paths needed by kselftest.h and local headers
+CFLAGS += -std=gnu99 -I.
+
+TEST_GEN_FILES := mmap_default mmap_bottomup
+
+TEST_PROGS := run_mmap.sh
+
+include ../../lib.mk
+
+$(OUTPUT)/mm: mmap_default.c mmap_bottomup.c mmap_tests.h
+	$(CC) -o $@ $(CFLAGS) $(LDFLAGS) $^

linux-7.2.3/tools/testing/selftests/riscv/mm/mmap_bottomup.c

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+// SPDX-License-Identifier: GPL-2.0-only
+#include <sys/mman.h>
+#include <mmap_test.h>
+
+#include "kselftest_harness.h"
+
+TEST(infinite_rlimit)
+{
+	EXPECT_EQ(BOTTOM_UP, memory_layout());
+}
+
+TEST_HARNESS_MAIN

linux-7.2.3/tools/testing/selftests/riscv/mm/mmap_default.c

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+// SPDX-License-Identifier: GPL-2.0-only
+#include <sys/mman.h>
+#include <mmap_test.h>
+
+#include "kselftest_harness.h"
+
+TEST(default_rlimit)
+{
+	EXPECT_EQ(TOP_DOWN, memory_layout());
+}
+
+TEST_HARNESS_MAIN

linux-7.2.3/tools/testing/selftests/riscv/mm/mmap_test.h

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+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef _TESTCASES_MMAP_TEST_H
+#define _TESTCASES_MMAP_TEST_H
+#include <sys/mman.h>
+#include <sys/resource.h>
+#include <stddef.h>
+#include <strings.h>
+#include "kselftest_harness.h"
+
+#define TOP_DOWN 0
+#define BOTTOM_UP 1
+
+#define PROT (PROT_READ | PROT_WRITE)
+#define FLAGS (MAP_PRIVATE | MAP_ANONYMOUS)
+
+static inline int memory_layout(void)
+{
+	void *value1 = mmap(NULL, sizeof(int), PROT, FLAGS, 0, 0);
+	void *value2 = mmap(NULL, sizeof(int), PROT, FLAGS, 0, 0);
+
+	return value2 > value1;
+}
+#endif /* _TESTCASES_MMAP_TEST_H */

linux-7.2.3/tools/testing/selftests/riscv/mm/run_mmap.sh

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+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+
+original_stack_limit=$(ulimit -s)
+
+./mmap_default
+
+# Force mmap_bottomup to be ran with bottomup memory due to
+# the unlimited stack
+ulimit -s unlimited
+./mmap_bottomup
+ulimit -s $original_stack_limit