[PATCH v6 1/4] x86/boot: Wrap up the SRAT traversing code into subtable_parse()

[Masayoshi Mizuma]

From: Masayoshi Mizuma <m.mizuma@xxxxxxxxxxxxxx>

Wrap up the SRAT traversing code into subtable_parse().

Reviewed-by: Baoquan He <bhe@xxxxxxxxxx>
Signed-off-by: Masayoshi Mizuma <m.mizuma@xxxxxxxxxxxxxx>
---
 arch/x86/boot/compressed/acpi.c | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/arch/x86/boot/compressed/acpi.c b/arch/x86/boot/compressed/acpi.c
index 25019d42ae93..a0f81438a0fd 100644
--- a/arch/x86/boot/compressed/acpi.c
+++ b/arch/x86/boot/compressed/acpi.c
@@ -362,6 +362,19 @@ static unsigned long get_acpi_srat_table(void)
 	return 0;
 }
 
+static void subtable_parse(struct acpi_subtable_header *sub_table, int *num)
+{
+	struct acpi_srat_mem_affinity *ma;
+
+	ma = (struct acpi_srat_mem_affinity *)sub_table;
+
+	if (!(ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) && ma->length) {
+		immovable_mem[*num].start = ma->base_address;
+		immovable_mem[*num].size = ma->length;
+		(*num)++;
+	}
+}
+
 /**
  * count_immovable_mem_regions - Parse SRAT and cache the immovable
  * memory regions into the immovable_mem array.
@@ -395,14 +408,8 @@ int count_immovable_mem_regions(void)
 	while (table + sizeof(struct acpi_subtable_header) < table_end) {
 		sub_table = (struct acpi_subtable_header *)table;
 		if (sub_table->type == ACPI_SRAT_TYPE_MEMORY_AFFINITY) {
-			struct acpi_srat_mem_affinity *ma;
 
-			ma = (struct acpi_srat_mem_affinity *)sub_table;
-			if (!(ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) && ma->length) {
-				immovable_mem[num].start = ma->base_address;
-				immovable_mem[num].size = ma->length;
-				num++;
-			}
+			subtable_parse(sub_table, &num);
 
 			if (num >= MAX_NUMNODES*2) {
 				debug_putstr("Too many immovable memory regions, aborting.\n");
-- 
2.20.1