[PATCH -mm 5/8] acpi, numa, mem_hotplug: Mark hotpluggable memoryin memblock

[Zhang Yanfei]

From: Tang Chen <tangchen@xxxxxxxxxxxxxx>

When parsing SRAT, we know that which memory area is hotpluggable.
So we invoke function memblock_mark_hotplug() introduced by previous
patch to mark hotpluggable memory in memblock.

Besides, move setting back to top-down allocation just right after
we mark hotpluggable memory in memblock.

Signed-off-by: Tang Chen <tangchen@xxxxxxxxxxxxxx>
Signed-off-by: Zhang Yanfei <zhangyanfei@xxxxxxxxxxxxxx>
---
 arch/x86/kernel/setup.c |    7 -------
 arch/x86/mm/numa.c      |    2 ++
 arch/x86/mm/srat.c      |   13 +++++++++++++
 3 files changed, 15 insertions(+), 7 deletions(-)

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index b8fefb7..36cfce3 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -1132,13 +1132,6 @@ void __init setup_arch(char **cmdline_p)
 	early_acpi_boot_init();
 
 	initmem_init();
-
-	/*
-	 * When ACPI SRAT is parsed, which is done in initmem_init(),
-	 * set memblock back to the top-down direction.
-	 */
-	memblock_set_bottom_up(false);
-
 	memblock_find_dma_reserve();
 
 	/*
diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index ac4ea06..ef9130d 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -569,6 +569,8 @@ static int __init numa_init(int (*init_func)(void))
 	memset(&numa_meminfo, 0, sizeof(numa_meminfo));
 	WARN_ON(memblock_set_node(0, ULLONG_MAX, &memblock.memory,
 				  MAX_NUMNODES));
+	/* In case that parsing SRAT failed. */
+	WARN_ON(memblock_clear_hotplug(0, ULLONG_MAX));
 	numa_reset_distance();
 
 	ret = init_func();
diff --git a/arch/x86/mm/srat.c b/arch/x86/mm/srat.c
index 266ca91..246739c 100644
--- a/arch/x86/mm/srat.c
+++ b/arch/x86/mm/srat.c
@@ -181,6 +181,11 @@ acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
 		(unsigned long long) start, (unsigned long long) end - 1,
 		hotpluggable ? " hotplug" : "");
 
+	/* Mark hotplug range in memblock. */
+	if (hotpluggable && memblock_mark_hotplug(start, ma->length))
+		pr_warn("SRAT: Failed to mark hotplug range [mem %#010Lx-%#010Lx] in memblock\n",
+			(unsigned long long) start, (unsigned long long) end - 1);
+
 	return 0;
 out_err_bad_srat:
 	bad_srat();
@@ -197,5 +202,13 @@ int __init x86_acpi_numa_init(void)
 	ret = acpi_numa_init();
 	if (ret < 0)
 		return ret;
+
+	/*
+	 * When ACPI SRAT is parsed, and hotpluggable range in
+	 * memblock is marked, set memblock back to the top-down
+	 * direction.
+	 */
+	memblock_set_bottom_up(false);
+
 	return srat_disabled() ? -EINVAL : 0;
 }
-- 
1.7.1

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