[resend, PATCH v1 1/3] resource: Reuse for_each_resource() macro

[resend, PATCH v1 1/3] resource: Reuse for_each_resource() macro

[Andy Shevchenko]

We have a few places where for_each_resource() is open coded.
Replace that by the macro. This makes code easier to read and
understand.

With this, compile r_next() only for CONFIG_PROC_FS=y.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 kernel/resource.c | 34 +++++++++++++++++++---------------
 1 file changed, 19 insertions(+), 15 deletions(-)

diff --git a/kernel/resource.c b/kernel/resource.c
index b1763b2fd7ef..86716cd566e9 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -77,13 +77,6 @@ static struct resource *next_resource_skip_children(struct resource *p)
 	     (_p) = (_skip_children) ? next_resource_skip_children(_p) : \
 				       next_resource(_p))
 
-static void *r_next(struct seq_file *m, void *v, loff_t *pos)
-{
-	struct resource *p = v;
-	(*pos)++;
-	return (void *)next_resource(p);
-}
-
 #ifdef CONFIG_PROC_FS
 
 enum { MAX_IORES_LEVEL = 5 };
@@ -91,14 +84,26 @@ enum { MAX_IORES_LEVEL = 5 };
 static void *r_start(struct seq_file *m, loff_t *pos)
 	__acquires(resource_lock)
 {
-	struct resource *p = pde_data(file_inode(m->file));
-	loff_t l = 0;
+	struct resource *root = pde_data(file_inode(m->file));
+	struct resource *p;
+	loff_t l = *pos;
+
 	read_lock(&resource_lock);
-	for (p = p->child; p && l < *pos; p = r_next(m, p, &l))
-		;
+	for_each_resource(root, p, false) {
+		if (l-- == 0)
+			break;
+	}
+
 	return p;
 }
 
+static void *r_next(struct seq_file *m, void *v, loff_t *pos)
+{
+	struct resource *p = v;
+	(*pos)++;
+	return (void *)next_resource(p);
+}
+
 static void r_stop(struct seq_file *m, void *v)
 	__releases(resource_lock)
 {
@@ -336,7 +341,7 @@ static int find_next_iomem_res(resource_size_t start, resource_size_t end,
 
 	read_lock(&resource_lock);
 
-	for (p = iomem_resource.child; p; p = next_resource(p)) {
+	for_each_resource(&iomem_resource, p, false) {
 		/* If we passed the resource we are looking for, stop */
 		if (p->start > end) {
 			p = NULL;
@@ -1641,13 +1646,12 @@ __setup("reserve=", reserve_setup);
  */
 int iomem_map_sanity_check(resource_size_t addr, unsigned long size)
 {
-	struct resource *p = &iomem_resource;
 	resource_size_t end = addr + size - 1;
+	struct resource *p;
 	int err = 0;
-	loff_t l;
 
 	read_lock(&resource_lock);
-	for (p = p->child; p ; p = r_next(NULL, p, &l)) {
+	for_each_resource(&iomem_resource, p, false) {
 		/*
 		 * We can probably skip the resources without
 		 * IORESOURCE_IO attribute?
-- 
2.40.0.1.gaa8946217a0b

[resend, PATCH v1 2/3] resource: Unify next_resource() and next_resource_skip_children()

[Andy Shevchenko]

We have the next_resource() is used once and no user for the
next_resource_skip_children() outside of the for_each_resource().

Unify them by adding skip_children parameter to the next_resource().

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 kernel/resource.c | 19 ++++++-------------
 1 file changed, 6 insertions(+), 13 deletions(-)

diff --git a/kernel/resource.c b/kernel/resource.c
index 86716cd566e9..866ef3663a0b 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -56,26 +56,17 @@ struct resource_constraint {
 
 static DEFINE_RWLOCK(resource_lock);
 
-static struct resource *next_resource(struct resource *p)
+static struct resource *next_resource(struct resource *p, bool skip_children)
 {
-	if (p->child)
+	if (!skip_children && p->child)
 		return p->child;
 	while (!p->sibling && p->parent)
 		p = p->parent;
 	return p->sibling;
 }
 
-static struct resource *next_resource_skip_children(struct resource *p)
-{
-	while (!p->sibling && p->parent)
-		p = p->parent;
-	return p->sibling;
-}
-
 #define for_each_resource(_root, _p, _skip_children) \
-	for ((_p) = (_root)->child; (_p); \
-	     (_p) = (_skip_children) ? next_resource_skip_children(_p) : \
-				       next_resource(_p))
+	for ((_p) = (_root)->child; (_p); (_p) = next_resource(_p, _skip_children))
 
 #ifdef CONFIG_PROC_FS
 
@@ -100,8 +91,10 @@ static void *r_start(struct seq_file *m, loff_t *pos)
 static void *r_next(struct seq_file *m, void *v, loff_t *pos)
 {
 	struct resource *p = v;
+
 	(*pos)++;
-	return (void *)next_resource(p);
+
+	return (void *)next_resource(p, false);
 }
 
 static void r_stop(struct seq_file *m, void *v)
-- 
2.40.0.1.gaa8946217a0b

[resend, PATCH v1 3/3] resource: Constify resource crosscheck APIs

[Andy Shevchenko]

Constify APIs: _contains(), _overlaps(), _intersection(), _union().

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 include/linux/ioport.h | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/include/linux/ioport.h b/include/linux/ioport.h
index 25d768d48970..14f5cfabbbc8 100644
--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -229,7 +229,7 @@ static inline unsigned long resource_ext_type(const struct resource *res)
 	return res->flags & IORESOURCE_EXT_TYPE_BITS;
 }
 /* True iff r1 completely contains r2 */
-static inline bool resource_contains(struct resource *r1, struct resource *r2)
+static inline bool resource_contains(const struct resource *r1, const struct resource *r2)
 {
 	if (resource_type(r1) != resource_type(r2))
 		return false;
@@ -239,13 +239,13 @@ static inline bool resource_contains(struct resource *r1, struct resource *r2)
 }
 
 /* True if any part of r1 overlaps r2 */
-static inline bool resource_overlaps(struct resource *r1, struct resource *r2)
+static inline bool resource_overlaps(const struct resource *r1, const struct resource *r2)
 {
        return r1->start <= r2->end && r1->end >= r2->start;
 }
 
-static inline bool
-resource_intersection(struct resource *r1, struct resource *r2, struct resource *r)
+static inline bool resource_intersection(const struct resource *r1, const struct resource *r2,
+					 struct resource *r)
 {
 	if (!resource_overlaps(r1, r2))
 		return false;
@@ -254,8 +254,8 @@ resource_intersection(struct resource *r1, struct resource *r2, struct resource
 	return true;
 }
 
-static inline bool
-resource_union(struct resource *r1, struct resource *r2, struct resource *r)
+static inline bool resource_union(const struct resource *r1, const struct resource *r2,
+				  struct resource *r)
 {
 	if (!resource_overlaps(r1, r2))
 		return false;
-- 
2.40.0.1.gaa8946217a0b