selftests/mm: skip virtual_address_range tests on riscv

RISC-V doesn't currently have the behavior of restricting the virtual
address space which virtual_address_range tests check, this will
cause the tests fail. So lets disable the whole test suite for riscv64
for now, not build it and run_vmtests.sh will skip it if it is not present.

Link: https://lkml.kernel.org/r/20241008094141.549248-5-zhangchunyan@iscas.ac.cn
Signed-off-by: Chunyan Zhang <zhangchunyan@iscas.ac.cn>
Reviewed-by: Charlie Jenkins <charlie@rivosinc.com>
Acked-by: Palmer Dabbelt <palmer@rivosinc.com>
Cc: Alexandre Ghiti <alex@ghiti.fr>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Author: Chunyan Zhang

tools/testing/selftests/mm/Makefile

@@ -116,7 +116,9 @@ endif
 
 ifneq (,$(filter $(ARCH),arm64 mips64 parisc64 powerpc riscv64 s390x sparc64 x86_64 s390))
 TEST_GEN_FILES += va_high_addr_switch
+ifneq ($(ARCH),riscv64)
 TEST_GEN_FILES += virtual_address_range
+endif
 TEST_GEN_FILES += write_to_hugetlbfs
 endif
 

tools/testing/selftests/mm/run_vmtests.sh

@@ -347,10 +347,12 @@ if [ $VADDR64 -ne 0 ]; then
 	# allows high virtual address allocation requests independent
 	# of platform's physical memory.
 
-	prev_policy=$(cat /proc/sys/vm/overcommit_memory)
-	echo 1 > /proc/sys/vm/overcommit_memory
-	CATEGORY="hugevm" run_test ./virtual_address_range
-	echo $prev_policy > /proc/sys/vm/overcommit_memory
+	if [ -x ./virtual_address_range ]; then
+		prev_policy=$(cat /proc/sys/vm/overcommit_memory)
+		echo 1 > /proc/sys/vm/overcommit_memory
+		CATEGORY="hugevm" run_test ./virtual_address_range
+		echo $prev_policy > /proc/sys/vm/overcommit_memory
+	fi
 
 	# va high address boundary switch test
 	ARCH_ARM64="arm64"