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MIPS: Allow __cpu_number_map to be larger than NR_CPUS

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In systems where the CPU id space is sparse, this allows a smaller
NR_CPUS to be chosen, thus keeping internal data structures smaller.

Signed-off-by: David Daney <david.daney@cavium.com>
Signed-off-by: Carlos Munoz <cmunoz@caviumnetworks.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/17388/
[jhogan@kernel.org: Add depends on SMP to fix
 "warning: symbol value '' invalid for MIPS_NR_CPU_NR_MAP"]
Signed-off-by: James Hogan <jhogan@kernel.org>
This commit is contained in:
David Daney 2017-09-28 12:34:04 -05:00 committed by James Hogan
parent 239e14d195
commit 7820b84be8
3 changed files with 13 additions and 3 deletions
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12
arch/mips/Kconfig
View File

@ -915,7 +915,8 @@ config CAVIUM_OCTEON_SOC
select USE_OF
select ARCH_SPARSEMEM_ENABLE
select SYS_SUPPORTS_SMP
select NR_CPUS_DEFAULT_16
select NR_CPUS_DEFAULT_64
select MIPS_NR_CPU_NR_MAP_1024
select BUILTIN_DTB
select MTD_COMPLEX_MAPPINGS
select SYS_SUPPORTS_RELOCATABLE
@ -2725,6 +2726,15 @@ config NR_CPUS
config MIPS_PERF_SHARED_TC_COUNTERS
bool
config MIPS_NR_CPU_NR_MAP_1024
bool
config MIPS_NR_CPU_NR_MAP
int
depends on SMP
default 1024 if MIPS_NR_CPU_NR_MAP_1024
default NR_CPUS if !MIPS_NR_CPU_NR_MAP_1024
#
# Timer Interrupt Frequency Configuration
#

2
arch/mips/include/asm/smp.h
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@ -29,7 +29,7 @@ extern cpumask_t cpu_foreign_map[];
/* Map from cpu id to sequential logical cpu number. This will only
not be idempotent when cpus failed to come on-line. */
extern int __cpu_number_map[NR_CPUS];
extern int __cpu_number_map[CONFIG_MIPS_NR_CPU_NR_MAP];
#define cpu_number_map(cpu) __cpu_number_map[cpu]
/* The reverse map from sequential logical cpu number to cpu id. */

2
arch/mips/kernel/smp.c
View File

@ -48,7 +48,7 @@
#include <asm/setup.h>
#include <asm/maar.h>
int __cpu_number_map[NR_CPUS]; /* Map physical to logical */
int __cpu_number_map[CONFIG_MIPS_NR_CPU_NR_MAP]; /* Map physical to logical */
EXPORT_SYMBOL(__cpu_number_map);
int __cpu_logical_map[NR_CPUS]; /* Map logical to physical */