linux-kernel - [PATCH next v2] of/fdt: Fix defined but not used compiler warning

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Message-ID: <20190615030343.96524-1-wangkefeng.wang@huawei.com>
Date:   Sat, 15 Jun 2019 11:03:43 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     Kefeng Wang <wangkefeng.wang@...wei.com>,
        Stephen Boyd <swboyd@...omium.org>,
        Rob Herring <robh@...nel.org>,
        Frank Rowand <frowand.list@...il.com>
Subject: [PATCH next v2] of/fdt: Fix defined but not used compiler warning

When CONFIG_OF_EARLY_FLATTREE is disabled, there is a compiler
warning,

drivers/of/fdt.c:129:19: warning: ‘of_fdt_match’ defined but not used [-Wunused-function]
 static int __init of_fdt_match(const void *blob, unsigned long node,

Since the only caller of of_fdt_match() is of_flat_dt_match(),
let's move the body of of_fdt_match() into of_flat_dt_match()
and eliminate of_fdt_match().

Meanwhile, move of_fdt_is_compatible() under CONFIG_OF_EARLY_FLATTREE,
as all callers are over there.

Cc: Stephen Boyd <swboyd@...omium.org>
Cc: Rob Herring <robh@...nel.org>
Cc: Frank Rowand <frowand.list@...il.com>
Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
---
v2:
-Move the body of of_fdt_match() into of_flat_dt_match(), suggested by Frank.

 drivers/of/fdt.c | 99 ++++++++++++++++++++++--------------------------
 1 file changed, 45 insertions(+), 54 deletions(-)

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 3d36b5afd9bd..cd17dc62a719 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -78,38 +78,6 @@ void __init of_fdt_limit_memory(int limit)
 	}
 }
 
-/**
- * of_fdt_is_compatible - Return true if given node from the given blob has
- * compat in its compatible list
- * @blob: A device tree blob
- * @node: node to test
- * @compat: compatible string to compare with compatible list.
- *
- * On match, returns a non-zero value with smaller values returned for more
- * specific compatible values.
- */
-static int of_fdt_is_compatible(const void *blob,
-		      unsigned long node, const char *compat)
-{
-	const char *cp;
-	int cplen;
-	unsigned long l, score = 0;
-
-	cp = fdt_getprop(blob, node, "compatible", &cplen);
-	if (cp == NULL)
-		return 0;
-	while (cplen > 0) {
-		score++;
-		if (of_compat_cmp(cp, compat, strlen(compat)) == 0)
-			return score;
-		l = strlen(cp) + 1;
-		cp += l;
-		cplen -= l;
-	}
-
-	return 0;
-}
-
 static bool of_fdt_device_is_available(const void *blob, unsigned long node)
 {
 	const char *status = fdt_getprop(blob, node, "status", NULL);
@@ -123,27 +91,6 @@ static bool of_fdt_device_is_available(const void *blob, unsigned long node)
 	return false;
 }
 
-/**
- * of_fdt_match - Return true if node matches a list of compatible values
- */
-static int __init of_fdt_match(const void *blob, unsigned long node,
-			       const char *const *compat)
-{
-	unsigned int tmp, score = 0;
-
-	if (!compat)
-		return 0;
-
-	while (*compat) {
-		tmp = of_fdt_is_compatible(blob, node, *compat);
-		if (tmp && (score == 0 || (tmp < score)))
-			score = tmp;
-		compat++;
-	}
-
-	return score;
-}
-
 static void *unflatten_dt_alloc(void **mem, unsigned long size,
 				       unsigned long align)
 {
@@ -764,6 +711,38 @@ const void *__init of_get_flat_dt_prop(unsigned long node, const char *name,
 	return fdt_getprop(initial_boot_params, node, name, size);
 }
 
+/**
+ * of_fdt_is_compatible - Return true if given node from the given blob has
+ * compat in its compatible list
+ * @blob: A device tree blob
+ * @node: node to test
+ * @compat: compatible string to compare with compatible list.
+ *
+ * On match, returns a non-zero value with smaller values returned for more
+ * specific compatible values.
+ */
+static int of_fdt_is_compatible(const void *blob,
+		      unsigned long node, const char *compat)
+{
+	const char *cp;
+	int cplen;
+	unsigned long l, score = 0;
+
+	cp = fdt_getprop(blob, node, "compatible", &cplen);
+	if (cp == NULL)
+		return 0;
+	while (cplen > 0) {
+		score++;
+		if (of_compat_cmp(cp, compat, strlen(compat)) == 0)
+			return score;
+		l = strlen(cp) + 1;
+		cp += l;
+		cplen -= l;
+	}
+
+	return 0;
+}
+
 /**
  * of_flat_dt_is_compatible - Return true if given node has compat in compatible list
  * @node: node to test
@@ -779,7 +758,19 @@ int __init of_flat_dt_is_compatible(unsigned long node, const char *compat)
  */
 static int __init of_flat_dt_match(unsigned long node, const char *const *compat)
 {
-	return of_fdt_match(initial_boot_params, node, compat);
+	unsigned int tmp, score = 0;
+
+	if (!compat)
+		return 0;
+
+	while (*compat) {
+		tmp = of_fdt_is_compatible(initial_boot_params, node, *compat);
+		if (tmp && (score == 0 || (tmp < score)))
+			score = tmp;
+		compat++;
+	}
+
+	return score;
 }
 
 /**
-- 
2.20.1