[PATCH v4 3/4] x86/boot: Get the max address from SRAT

[Masayoshi Mizuma]

From: Masayoshi Mizuma <m.mizuma@xxxxxxxxxxxxxx>

Get the max address from SRAT and write it into boot_params->max_addr.

Signed-off-by: Masayoshi Mizuma <m.mizuma@xxxxxxxxxxxxxx>
---
 arch/x86/boot/compressed/acpi.c | 26 ++++++++++++++++++++------
 1 file changed, 20 insertions(+), 6 deletions(-)

diff --git a/arch/x86/boot/compressed/acpi.c b/arch/x86/boot/compressed/acpi.c
index a0f81438a..764206c23 100644
--- a/arch/x86/boot/compressed/acpi.c
+++ b/arch/x86/boot/compressed/acpi.c
@@ -362,17 +362,25 @@ static unsigned long get_acpi_srat_table(void)
 	return 0;
 }
 
-static void subtable_parse(struct acpi_subtable_header *sub_table, int *num)
+static unsigned long subtable_parse(struct acpi_subtable_header *sub_table,
+				    int *num)
 {
 	struct acpi_srat_mem_affinity *ma;
+	unsigned long addr = 0;
 
 	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)++;
+	if (ma->length) {
+		if (ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE)
+			addr = ma->base_address + ma->length;
+		else {
+			immovable_mem[*num].start = ma->base_address;
+			immovable_mem[*num].size = ma->length;
+			(*num)++;
+		}
 	}
+
+	return addr;
 }
 
 /**
@@ -391,6 +399,7 @@ int count_immovable_mem_regions(void)
 	struct acpi_subtable_header *sub_table;
 	struct acpi_table_header *table_header;
 	char arg[MAX_ACPI_ARG_LENGTH];
+	unsigned long max_addr = 0, addr;
 	int num = 0;
 
 	if (cmdline_find_option("acpi", arg, sizeof(arg)) == 3 &&
@@ -409,7 +418,9 @@ int count_immovable_mem_regions(void)
 		sub_table = (struct acpi_subtable_header *)table;
 		if (sub_table->type == ACPI_SRAT_TYPE_MEMORY_AFFINITY) {
 
-			subtable_parse(sub_table, &num);
+			addr = subtable_parse(sub_table, &num);
+			if (addr > max_addr)
+				max_addr = addr;
 
 			if (num >= MAX_NUMNODES*2) {
 				debug_putstr("Too many immovable memory regions, aborting.\n");
@@ -418,6 +429,9 @@ int count_immovable_mem_regions(void)
 		}
 		table += sub_table->length;
 	}
+
+	boot_params->max_addr = max_addr;
+
 	return num;
 }
 #endif /* CONFIG_RANDOMIZE_BASE && CONFIG_MEMORY_HOTREMOVE */
-- 
2.20.1