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Date: Wed, 10 Apr 2013 18:23:01 +0800
From: Hanjun Guo <guohanjun@...wei.com>
To: <kernel.openeuler@...wei.com>
CC: Toshi Kani <toshi.kani@...com>, Jiang Liu <jiang.liu@...wei.com>,
<linux-ia64@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH 4/4] ACPI: Only count valid srat memory structures
From: Thomas Renninger <trenn@...e.de>
mainline inclusion
from mainline-3.6
upstream commit 095adbb6441172985f5ddc3b9e88cb3191bdeac4
category: bugfix
If BIOS provide OS with SRAT table which contains only one disabled
memory affinity structure, this will trigger a WARN_ON.
This patch is based on the former one "ACPI: Untangle a return
statement for better readability".
--------------------------------------------------------
Otherwise you could run into:
WARN_ON in numa_register_memblks(), because node_possible_map is zero
References: https://bugzilla.novell.com/show_bug.cgi?id=757888
On this machine (ProLiant ML570 G3) the SRAT table contains:
- No processor affinities
- One memory affinity structure (which is set disabled)
CC: Per Jessen <per@...nsuse.org>
CC: Andi Kleen <andi@...stfloor.org>
Signed-off-by: Thomas Renninger <trenn@...e.de>
Signed-off-by: Len Brown <len.brown@...el.com>
Integrated-by: Hanjun Guo <guohanjun@...wei.com>
---
arch/ia64/kernel/acpi.c | 5 +++--
arch/x86/mm/srat.c | 16 +++++++++-------
drivers/acpi/numa.c | 8 +++++---
include/linux/acpi.h | 2 +-
4 files changed, 18 insertions(+), 13 deletions(-)
diff --git a/arch/ia64/kernel/acpi.c b/arch/ia64/kernel/acpi.c
index 6f38b61..4405788 100644
--- a/arch/ia64/kernel/acpi.c
+++ b/arch/ia64/kernel/acpi.c
@@ -497,7 +497,7 @@ acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
srat_num_cpus++;
}
-void __init
+int __init
acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
{
unsigned long paddr, size;
@@ -512,7 +512,7 @@ acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
/* Ignore disabled entries */
if (!(ma->flags & ACPI_SRAT_MEM_ENABLED))
- return;
+ return -1;
/* record this node in proximity bitmap */
pxm_bit_set(pxm);
@@ -531,6 +531,7 @@ acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
p->size = size;
p->nid = pxm;
num_node_memblks++;
+ return 0;
}
void __init acpi_numa_arch_fixup(void)
diff --git a/arch/x86/mm/srat.c b/arch/x86/mm/srat.c
index efb5b4b..db870ec 100644
--- a/arch/x86/mm/srat.c
+++ b/arch/x86/mm/srat.c
@@ -142,23 +142,23 @@ static inline int save_add_info(void) {return 0;}
#endif
/* Callback for parsing of the Proximity Domain <-> Memory Area mappings */
-void __init
+int __init
acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
{
u64 start, end;
int node, pxm;
if (srat_disabled())
- return;
+ return -1;
if (ma->header.length != sizeof(struct acpi_srat_mem_affinity)) {
bad_srat();
- return;
+ return -1;
}
if ((ma->flags & ACPI_SRAT_MEM_ENABLED) == 0)
- return;
+ return -1;
if ((ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) && !save_add_info())
- return;
+ return -1;
start = ma->base_address;
end = start + ma->length;
pxm = ma->proximity_domain;
@@ -168,16 +168,18 @@ acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
if (node < 0) {
printk(KERN_ERR "SRAT: Too many proximity domains.\n");
bad_srat();
- return;
+ return -1;
}
if (numa_add_memblk(node, start, end) < 0) {
bad_srat();
- return;
+ return -1;
}
printk(KERN_INFO "SRAT: Node %u PXM %u %Lx-%Lx\n", node, pxm,
start, end);
+
+ return 0;
}
void __init acpi_numa_arch_fixup(void) {}
diff --git a/drivers/acpi/numa.c b/drivers/acpi/numa.c
index 2a63993..cb31298 100644
--- a/drivers/acpi/numa.c
+++ b/drivers/acpi/numa.c
@@ -237,6 +237,8 @@ acpi_parse_processor_affinity(struct acpi_subtable_header *header,
return 0;
}
+static int __initdata parsed_numa_memblks;
+
static int __init
acpi_parse_memory_affinity(struct acpi_subtable_header * header,
const unsigned long end)
@@ -250,8 +252,8 @@ acpi_parse_memory_affinity(struct acpi_subtable_header * header,
acpi_table_print_srat_entry(header);
/* let architecture-dependent part to do it */
- acpi_numa_memory_affinity_init(memory_affinity);
-
+ if (!acpi_numa_memory_affinity_init(memory_affinity))
+ parsed_numa_memblks++;
return 0;
}
@@ -306,7 +308,7 @@ int __init acpi_numa_init(void)
if (cnt < 0)
return cnt;
- else if (cnt == 0)
+ else if (!parsed_numa_memblks)
return -ENOENT;
return 0;
}
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index f421dd8..8b88441 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -96,7 +96,7 @@ void acpi_table_print_madt_entry (struct acpi_subtable_header *madt);
void acpi_numa_slit_init (struct acpi_table_slit *slit);
void acpi_numa_processor_affinity_init (struct acpi_srat_cpu_affinity *pa);
void acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa);
-void acpi_numa_memory_affinity_init (struct acpi_srat_mem_affinity *ma);
+int acpi_numa_memory_affinity_init (struct acpi_srat_mem_affinity *ma);
void acpi_numa_arch_fixup(void);
#ifdef CONFIG_ACPI_HOTPLUG_CPU
--
1.6.0.2
--
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