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ARM: SMP: move CPU number sanity checks to smp_init_cpus()

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Ensure that the number of CPUs is sanity checked before setting
the number of possible CPUs.  This avoids any chance of overflowing
the cpu_possible bitmap.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2010-12-03 10:42:58 +00:00
parent 28e18293cf
commit bbc3d14e9a
3 changed files with 34 additions and 33 deletions
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21
arch/arm/mach-omap2/omap-smp.c
View File

@ -120,16 +120,6 @@ void __init smp_init_cpus(void)
ncores = get_core_count();
for (i = 0; i < ncores; i++)
set_cpu_possible(i, true);
}
void __init smp_prepare_cpus(unsigned int max_cpus)
{
unsigned int ncores = get_core_count();
unsigned int cpu = smp_processor_id();
int i;
/* sanity check */
if (ncores == 0) {
printk(KERN_ERR
@ -144,6 +134,17 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
ncores, NR_CPUS);
ncores = NR_CPUS;
}
for (i = 0; i < ncores; i++)
set_cpu_possible(i, true);
}
void __init smp_prepare_cpus(unsigned int max_cpus)
{
unsigned int ncores = num_possible_cpus();
unsigned int cpu = smp_processor_id();
int i;
smp_store_cpu_info(cpu);
/*

20
arch/arm/mach-realview/platsmp.c
View File

@ -160,16 +160,6 @@ void __init smp_init_cpus(void)
{
unsigned int i, ncores = get_core_count();
for (i = 0; i < ncores; i++)
set_cpu_possible(i, true);
}
void __init smp_prepare_cpus(unsigned int max_cpus)
{
unsigned int ncores = get_core_count();
unsigned int cpu = smp_processor_id();
int i;
/* sanity check */
if (ncores == 0) {
printk(KERN_ERR
@ -186,6 +176,16 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
ncores = NR_CPUS;
}
for (i = 0; i < ncores; i++)
set_cpu_possible(i, true);
}
void __init smp_prepare_cpus(unsigned int max_cpus)
{
unsigned int ncores = num_possible_cpus();
unsigned int cpu = smp_processor_id();
int i;
smp_store_cpu_info(cpu);
/*

26
arch/arm/mach-ux500/platsmp.c
View File

@ -128,16 +128,6 @@ void __init smp_init_cpus(void)
{
unsigned int i, ncores = get_core_count();
for (i = 0; i < ncores; i++)
set_cpu_possible(i, true);
}
void __init smp_prepare_cpus(unsigned int max_cpus)
{
unsigned int ncores = get_core_count();
unsigned int cpu = smp_processor_id();
int i;
/* sanity check */
if (ncores == 0) {
printk(KERN_ERR
@ -145,14 +135,24 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
ncores = 1;
}
if (ncores > num_possible_cpus()) {
if (ncores > NR_CPUS) {
printk(KERN_WARNING
"U8500: no. of cores (%d) greater than configured "
"maximum of %d - clipping\n",
ncores, num_possible_cpus());
ncores = num_possible_cpus();
ncores, NR_CPUS);
ncores = NR_CPUS;
}
for (i = 0; i < ncores; i++)
set_cpu_possible(i, true);
}
void __init smp_prepare_cpus(unsigned int max_cpus)
{
unsigned int ncores = num_possible_cpus();
unsigned int cpu = smp_processor_id();
int i;
smp_store_cpu_info(cpu);
/*