diff options
| author | Will Deacon <will.deacon@arm.com> | 2012-01-20 15:01:12 +0400 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-01-23 14:20:05 +0400 |
| commit | eb50439b92b6298bf209a982f295ba9c0f7cb30b (patch) | |
| tree | 8678f4221e4a40907d9781753a8b95c96bbfded6 /arch/arm/include/asm/smp_plat.h | |
| parent | a092f2b15399bb4d1aa4e83cffe775f0c946f323 (diff) | |
| download | linux-eb50439b92b6298bf209a982f295ba9c0f7cb30b.tar.xz | |
ARM: 7293/1: logical_cpu_map: decouple CPU mapping from SMP
It turns out that the logical CPU mapping is useful even when !CONFIG_SMP
for manipulation of devices like interrupt and power controllers when
running a UP kernel on a CPU other than 0. This can happen when kexecing
a UP image from an SMP kernel.
In the future, multi-cluster systems running AMP configurations will
require something similar for mapping cluster IDs, so it makes sense to
decouple this logic in preparation for this support.
Acked-by: Yang Bai <hamo.by@gmail.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Reported-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/include/asm/smp_plat.h')
| -rw-r--r-- | arch/arm/include/asm/smp_plat.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/arm/include/asm/smp_plat.h b/arch/arm/include/asm/smp_plat.h index f24c1b9e211d..558d6c80aca9 100644 --- a/arch/arm/include/asm/smp_plat.h +++ b/arch/arm/include/asm/smp_plat.h @@ -43,4 +43,10 @@ static inline int cache_ops_need_broadcast(void) } #endif +/* + * Logical CPU mapping. + */ +extern int __cpu_logical_map[]; +#define cpu_logical_map(cpu) __cpu_logical_map[cpu] + #endif |