On Wed, Mar 25, 2015 at 05:17:35PM +0000, Catalin Marinas wrote:

On Tue, Mar 24, 2015 at 10:02:45PM +0800, Hanjun Guo wrote:

quoted

+/**
+ * acpi_map_gic_cpu_interface - generates a logical cpu number
+ * and map to MPIDR represented by GICC structure
+ * @mpidr: CPU's hardware id to register, MPIDR represented in MADT
+ * @enabled: this cpu is enabled or not
+ *
+ * Returns the logical cpu number which maps to MPIDR
+ */
+static int __init acpi_map_gic_cpu_interface(u64 mpidr, u8 enabled)

So here we have an u8 enabled.

quoted

+static int __init
+acpi_parse_gic_cpu_interface(struct acpi_subtable_header *header,
+				const unsigned long end)
+{
+	struct acpi_madt_generic_interrupt *processor;
+
+	processor = (struct acpi_madt_generic_interrupt *)header;
+
+	if (BAD_MADT_ENTRY(processor, end))
+		return -EINVAL;
+
+	acpi_table_print_madt_entry(header);
+
+	acpi_map_gic_cpu_interface(processor->arm_mpidr & MPIDR_HWID_BITMASK,
+		processor->flags & ACPI_MADT_ENABLED);

and here processor->flags is u32. Luckily, ACPI_MADT_ENABLED is 1 and we
don't lose any information. So either make the enabled above a bool or
simply pass the flags with the check in acpi_map_gic_cpu_interface()
(personal preference for the latter).

I've applied the following patch on top of the series.

Will

--->8

commit 8ef320319592693f4a6286d80df210fd47b3e356
Author: Will Deacon [off-list ref]
Date:   Thu Mar 26 15:09:20 2015 +0000

    ARM64 / ACPI: fix usage of acpi_map_gic_cpu_interface
    
    acpi_parse_gic_cpu_interface calls acpi_map_gic_cpu_interface by both
    passing a 32-bit value in the u8 enabled parameter and then subsequently
    ignoring its return value.
    
    Sort it out.
    
    Reported-by: Catalin Marinas [off-list ref]
    Signed-off-by: Will Deacon [off-list ref]

diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c
index cd60329da8c4..07649e413244 100644
--- a/arch/arm64/kernel/acpi.c
+++ b/arch/arm64/kernel/acpi.c

@@ -103,9 +103,12 @@ void __init __acpi_unmap_table(char *map, unsigned long size)
  *
  * Returns the logical cpu number which maps to MPIDR
  */
-static int __init acpi_map_gic_cpu_interface(u64 mpidr, u8 enabled)
+static int __init
+acpi_map_gic_cpu_interface(struct acpi_madt_generic_interrupt *processor)
 {
 	int i;
+	u64 mpidr = processor->arm_mpidr & MPIDR_HWID_BITMASK;
+	bool enabled = !!(processor->flags & ACPI_MADT_ENABLED);
 
 	if (mpidr == INVALID_HWID) {
 		pr_info("Skip MADT cpu entry with invalid MPIDR\n");

@@ -178,11 +181,7 @@ acpi_parse_gic_cpu_interface(struct acpi_subtable_header *header,
 		return -EINVAL;
 
 	acpi_table_print_madt_entry(header);
-
-	acpi_map_gic_cpu_interface(processor->arm_mpidr & MPIDR_HWID_BITMASK,
-		processor->flags & ACPI_MADT_ENABLED);
-
-	return 0;
+	return acpi_map_gic_cpu_interface(processor);
 }
 
 /* Parse GIC cpu interface entries in MADT for SMP init */