[PATCH v3 5/7] of: reserved_mem: rearrange code a bit

From: Marek Szyprowski

Date: Wed Mar 25 2026 - 05:04:51 EST


Move __rmem_check_for_overlap() and __rmem_cmp() functions before
fdt_scan_reserved_mem_reg_nodes() to avoid forward declaration and keep
related code close together.

Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
---
drivers/of/of_reserved_mem.c | 99 ++++++++++++++++++------------------
1 file changed, 49 insertions(+), 50 deletions(-)

diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c
index 5dd585bcf8a8..f9b6d3ebcc20 100644
--- a/drivers/of/of_reserved_mem.c
+++ b/drivers/of/of_reserved_mem.c
@@ -214,7 +214,55 @@ static int __init __reserved_mem_check_root(unsigned long node)
return 0;
}

-static void __init __rmem_check_for_overlap(void);
+static int __init __rmem_cmp(const void *a, const void *b)
+{
+ const struct reserved_mem *ra = a, *rb = b;
+
+ if (ra->base < rb->base)
+ return -1;
+
+ if (ra->base > rb->base)
+ return 1;
+
+ /*
+ * Put the dynamic allocations (address == 0, size == 0) before static
+ * allocations at address 0x0 so that overlap detection works
+ * correctly.
+ */
+ if (ra->size < rb->size)
+ return -1;
+ if (ra->size > rb->size)
+ return 1;
+
+ return 0;
+}
+
+static void __init __rmem_check_for_overlap(void)
+{
+ int i;
+
+ if (reserved_mem_count < 2)
+ return;
+
+ sort(reserved_mem, reserved_mem_count, sizeof(reserved_mem[0]),
+ __rmem_cmp, NULL);
+ for (i = 0; i < reserved_mem_count - 1; i++) {
+ struct reserved_mem *this, *next;
+
+ this = &reserved_mem[i];
+ next = &reserved_mem[i + 1];
+
+ if (this->base + this->size > next->base) {
+ phys_addr_t this_end, next_end;
+
+ this_end = this->base + this->size;
+ next_end = next->base + next->size;
+ pr_err("OVERLAP DETECTED!\n%s (%pa--%pa) overlaps with %s (%pa--%pa)\n",
+ this->name, &this->base, &this_end,
+ next->name, &next->base, &next_end);
+ }
+ }
+}

/**
* fdt_scan_reserved_mem_reg_nodes() - Store info for the "reg" defined
@@ -565,55 +613,6 @@ static int __init __reserved_mem_init_node(struct reserved_mem *rmem,
return ret;
}

-static int __init __rmem_cmp(const void *a, const void *b)
-{
- const struct reserved_mem *ra = a, *rb = b;
-
- if (ra->base < rb->base)
- return -1;
-
- if (ra->base > rb->base)
- return 1;
-
- /*
- * Put the dynamic allocations (address == 0, size == 0) before static
- * allocations at address 0x0 so that overlap detection works
- * correctly.
- */
- if (ra->size < rb->size)
- return -1;
- if (ra->size > rb->size)
- return 1;
-
- return 0;
-}
-
-static void __init __rmem_check_for_overlap(void)
-{
- int i;
-
- if (reserved_mem_count < 2)
- return;
-
- sort(reserved_mem, reserved_mem_count, sizeof(reserved_mem[0]),
- __rmem_cmp, NULL);
- for (i = 0; i < reserved_mem_count - 1; i++) {
- struct reserved_mem *this, *next;
-
- this = &reserved_mem[i];
- next = &reserved_mem[i + 1];
-
- if (this->base + this->size > next->base) {
- phys_addr_t this_end, next_end;
-
- this_end = this->base + this->size;
- next_end = next->base + next->size;
- pr_err("OVERLAP DETECTED!\n%s (%pa--%pa) overlaps with %s (%pa--%pa)\n",
- this->name, &this->base, &this_end,
- next->name, &next->base, &next_end);
- }
- }
-}

/**
* fdt_init_reserved_mem_node() - Initialize a reserved memory region
--
2.34.1