crypto: hisilicon/qm: Fix to enable build with RISC-V clang

With CONFIG_ACPI enabled for RISC-V, this driver gets enabled in
allmodconfig build. However, build fails with clang and below
error is seen.

drivers/crypto/hisilicon/qm.c:627:10: error: invalid output constraint '+Q' in asm
                       "+Q" (*((char __iomem *)fun_base))
                       ^
This is expected error with clang due to the way it is designed.

To fix this issue, move arm64 assembly code under #if.

Link: ClangBuiltLinux#999
Signed-off-by: Nathan Chancellor <[email protected]>
[[email protected]: Moved tmp0 and tmp1 into the #if]
Signed-off-by: Sunil V L <[email protected]>

Author: vlsunil

drivers/crypto/hisilicon/qm.c

@@ -610,14 +610,16 @@ EXPORT_SYMBOL_GPL(hisi_qm_wait_mb_ready);
 static void qm_mb_write(struct hisi_qm *qm, const void *src)
 {
 	void __iomem *fun_base = qm->io_base + QM_MB_CMD_SEND_BASE;
-	unsigned long tmp0 = 0, tmp1 = 0;
 
 	if (!IS_ENABLED(CONFIG_ARM64)) {
 		memcpy_toio(fun_base, src, 16);
 		dma_wmb();
 		return;
 	}
 
+#if IS_ENABLED(CONFIG_ARM64)
+	unsigned long tmp0 = 0, tmp1 = 0;
+
 	asm volatile("ldp %0, %1, %3\n"
 		     "stp %0, %1, %2\n"
 		     "dmb oshst\n"
@@ -626,6 +628,8 @@ static void qm_mb_write(struct hisi_qm *qm, const void *src)
 		       "+Q" (*((char __iomem *)fun_base))
 		     : "Q" (*((char *)src))
 		     : "memory");
+#endif
+
 }
 
 static int qm_mb_nolock(struct hisi_qm *qm, struct qm_mailbox *mailbox)