[LTP] [PATCH] hugemmap15: Support RISC-V to do __cache_flush. (#79)

[Hui Min Mina Chou]

AndesCore CPU test fails due to an illegal instruction at the first
jumpfunc(), caused by executing incorrect instructions after
self-modifying code.

On RISC-V CPUs, a FENCE.i synchronizes instruction and data streams,
ensuring that subsequent instruction fetch on a RISC-V hart will see
any previous data stores already visible to the same RISC-V hart.

Thus, cacheflush() in the test should also use __clear_cache for RISC-V.
In SMP systems, it invokes the kernel syscall riscv_flush_icache to inform
each hart to flush their local i-caches.

Signed-off-by: Hui Min Mina Chou <minachou@andestech.com>
---
 testcases/kernel/mem/hugetlb/hugemmap/hugemmap15.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/testcases/kernel/mem/hugetlb/hugemmap/hugemmap15.c b/testcases/kernel/mem/hugetlb/hugemmap/hugemmap15.c
index 4d198407044a..a84ba6476f1e 100644
--- a/testcases/kernel/mem/hugetlb/hugemmap/hugemmap15.c
+++ b/testcases/kernel/mem/hugetlb/hugemmap/hugemmap15.c
@@ -47,7 +47,7 @@ static void cacheflush(void *p)
 {
 #if defined(__powerpc__)
 	asm volatile("dcbst 0,%0; sync; icbi 0,%0; isync" : : "r"(p));
-#elif defined(__arm__) || defined(__aarch64__)
+#elif defined(__arm__) || defined(__aarch64__) || defined(__riscv)
 	__clear_cache(p, p + COPY_SIZE);
 #else
 	(void)p;
-- 
2.34.1