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ARM: 7763/1: kernel: fix __cpu_logical_map default initialization

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The __cpu_logical_map array is statically initialized to 0, which is a valid
MPIDR value. To prevent issues with the current implementation, this patch
defines an MPIDR_INVALID value, and statically initializes the
__cpu_logical_map[] array to it. Entries in the arm_dt_init_cpu_maps()
tmp_map array used to stash DT reg properties while parsing DT are initialized
with the MPIDR_INVALID value as well for consistency.

Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Nicolas Pitre <nico@linaro.org>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Lorenzo Pieralisi 2013-06-19 10:40:48 +01:00 committed by Russell King
parent 1ba9bf0a9a
commit 18d7f152df
4 changed files with 5 additions and 3 deletions
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2
arch/arm/include/asm/cputype.h
View File

@ -32,6 +32,8 @@
#define MPIDR_HWID_BITMASK 0xFFFFFF
#define MPIDR_INVALID (~MPIDR_HWID_BITMASK)
#define MPIDR_LEVEL_BITS 8
#define MPIDR_LEVEL_MASK ((1 << MPIDR_LEVEL_BITS) - 1)

2
arch/arm/include/asm/smp_plat.h
View File

@ -49,7 +49,7 @@ static inline int cache_ops_need_broadcast(void)
/*
* Logical CPU mapping.
*/
extern int __cpu_logical_map[];
extern u32 __cpu_logical_map[];
#define cpu_logical_map(cpu) __cpu_logical_map[cpu]
/*
* Retrieve logical cpu index corresponding to a given MPIDR[23:0]

2
arch/arm/kernel/devtree.c
View File

@ -82,7 +82,7 @@ void __init arm_dt_init_cpu_maps(void)
u32 i, j, cpuidx = 1;
u32 mpidr = is_smp() ? read_cpuid_mpidr() & MPIDR_HWID_BITMASK : 0;
u32 tmp_map[NR_CPUS] = { [0 ... NR_CPUS-1] = UINT_MAX };
u32 tmp_map[NR_CPUS] = { [0 ... NR_CPUS-1] = MPIDR_INVALID };
bool bootcpu_valid = false;
cpus = of_find_node_by_path("/cpus");

2
arch/arm/kernel/setup.c
View File

@ -444,7 +444,7 @@ void notrace cpu_init(void)
: "r14");
}
int __cpu_logical_map[NR_CPUS];
u32 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = MPIDR_INVALID };
void __init smp_setup_processor_id(void)
{