[PATCH v2 2/3] cache: Check dcache availability before calling cache functions

[Boon Khai Ng]

When the data cache (dcache) is disabled, calling related
status functions can lead to compilation errors due to
undefined references.

Adding a !CONFIG_IS_ENABLED(SYS_DCACHE_OFF) check before
invoking dcache_status() (used in common/memsize.c:get_ram_size())
and mmu_status() (from arch/arm/include/asm/io.h).

Without this check, builds with dcache disabled will fail to compile.

Signed-off-by: Boon Khai Ng <boon.khai.ng at altera.com>
---
 arch/arm/include/asm/io.h | 28 ++++++++++++++++------------
 common/memsize.c          |  5 ++++-
 2 files changed, 20 insertions(+), 13 deletions(-)

diff --git a/arch/arm/include/asm/io.h b/arch/arm/include/asm/io.h
index 85ec0e6937e..cebed7397d4 100644
--- a/arch/arm/include/asm/io.h
+++ b/arch/arm/include/asm/io.h
@@ -386,12 +386,14 @@ void __memcpy_fromio(void *to, const volatile void __iomem *from, size_t count)
 		count--;
 	}
 
-	if (mmu_status()) {
-		while (count >= 8) {
-			*(u64 *)to = __raw_readq(from);
-			from += 8;
-			to += 8;
-			count -= 8;
+	if (!CONFIG_IS_ENABLED(SYS_DCACHE_OFF)) {
+		if (mmu_status()) {
+			while (count >= 8) {
+				*(u64 *)to = __raw_readq(from);
+				from += 8;
+				to += 8;
+				count -= 8;
+			}
 		}
 	}
 
@@ -416,12 +418,14 @@ void __memcpy_toio(volatile void __iomem *to, const void *from, size_t count)
 		count--;
 	}
 
-	if (mmu_status()) {
-		while (count >= 8) {
-			__raw_writeq(*(u64 *)from, to);
-			from += 8;
-			to += 8;
-			count -= 8;
+	if (!CONFIG_IS_ENABLED(SYS_DCACHE_OFF)) {
+		if (mmu_status()) {
+			while (count >= 8) {
+				__raw_writeq(*(u64 *)from, to);
+				from += 8;
+				to += 8;
+				count -= 8;
+			}
 		}
 	}
 
diff --git a/common/memsize.c b/common/memsize.c
index 86109579c95..3c3ae6f1eba 100644
--- a/common/memsize.c
+++ b/common/memsize.c
@@ -52,7 +52,10 @@ long get_ram_size(long *base, long maxsize)
 	long           val;
 	long           size;
 	int            i = 0;
-	int            dcache_en = dcache_status();
+	int            dcache_en = 0;
+
+	if (!CONFIG_IS_ENABLED(SYS_DCACHE_OFF))
+		dcache_en = dcache_status();
 
 	for (cnt = (maxsize / sizeof(long)) >> 1; cnt > 0; cnt >>= 1) {
 		addr = base + cnt;	/* pointer arith! */
-- 
2.35.3