Subject: [PATCH 5.15 427/846] of: fdt: Aggregate the processing of "linux, usable-memory-range"

From: Greg Kroah-Hartman <[email-masked]>
Date: Mon, 24 Jan 2022 19:39:04 +0100

From: Zhen Lei <[email-masked]>

[ Upstream commit 8347b41748c3019157312fbe7f8a6792ae396eb7 ]

Currently, we parse the "linux,usable-memory-range" property in
early_init_dt_scan_chosen(), to obtain the specified memory range of the
crash kernel. We then reserve the required memory after
early_init_dt_scan_memory() has identified all available physical memory.
Because the two pieces of code are separated far, the readability and
maintainability are reduced. So bring them together.

Suggested-by: Rob Herring <[email-masked]>
Signed-off-by: Zhen Lei <[email-masked]>
(change the prototype of early_init_dt_check_for_usable_mem_range(), in
order to use it outside)
Signed-off-by: Pingfan Liu <[email-masked]>
Tested-by: Dave Kleikamp <[email-masked]>
Acked-by: John Donnelly <[email-masked]>
Reviewed-by: Rob Herring <[email-masked]>
Cc: Catalin Marinas <[email-masked]>
Cc: Will Deacon <[email-masked]>
Cc: [email-masked]
To: [email-masked]
To: [email-masked]
Signed-off-by: Rob Herring <[email-masked]>
Signed-off-by: Sasha Levin <[email-masked]>
---
 drivers/of/fdt.c | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 4546572af24bb..105b1a47905ab 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -969,18 +969,22 @@ static void __init early_init_dt_check_for_elfcorehdr(unsigned long node)
 		 elfcorehdr_addr, elfcorehdr_size);
 }
 
-static phys_addr_t cap_mem_addr;
-static phys_addr_t cap_mem_size;
+static unsigned long chosen_node_offset = -FDT_ERR_NOTFOUND;
 
 /**
  * early_init_dt_check_for_usable_mem_range - Decode usable memory range
  * location from flat tree
- * @node: reference to node containing usable memory range location ('chosen')
  */
-static void __init early_init_dt_check_for_usable_mem_range(unsigned long node)
+static void __init early_init_dt_check_for_usable_mem_range(void)
 {
 	const __be32 *prop;
 	int len;
+	phys_addr_t cap_mem_addr;
+	phys_addr_t cap_mem_size;
+	unsigned long node = chosen_node_offset;
+
+	if ((long)node < 0)
+		return;
 
 	pr_debug("Looking for usable-memory-range property... ");
 
@@ -993,6 +997,8 @@ static void __init early_init_dt_check_for_usable_mem_range(unsigned long node)
 
 	pr_debug("cap_mem_start=%pa cap_mem_size=%pa\n", &cap_mem_addr,
 		 &cap_mem_size);
+
+	memblock_cap_memory_range(cap_mem_addr, cap_mem_size);
 }
 
 #ifdef CONFIG_SERIAL_EARLYCON
@@ -1141,9 +1147,10 @@ int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
 	    (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
 		return 0;
 
+	chosen_node_offset = node;
+
 	early_init_dt_check_for_initrd(node);
 	early_init_dt_check_for_elfcorehdr(node);
-	early_init_dt_check_for_usable_mem_range(node);
 
 	/* Retrieve command line */
 	p = of_get_flat_dt_prop(node, "bootargs", &l);
@@ -1279,7 +1286,7 @@ void __init early_init_dt_scan_nodes(void)
 	of_scan_flat_dt(early_init_dt_scan_memory, NULL);
 
 	/* Handle linux,usable-memory-range property */
-	memblock_cap_memory_range(cap_mem_addr, cap_mem_size);
+	early_init_dt_check_for_usable_mem_range();
 }
 
 bool __init early_init_dt_scan(void *params)
-- 
2.34.1

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