Techwizz/kernel-fxtec-pro1x
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

x86: move prefill_possible_map to common file

Browse source 
this patches moves prefill_possible_map() to smpboot.c
Right now it is x86_64-specific, but nothing intrinsically
prevents it to be used by i386

Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Glauber Costa 2008-03-03 14:12:42 -03:00 committed by Ingo Molnar
parent 7b1292e237
commit 68a1c3f8cd
5 changed files with 55 additions and 53 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
arch/x86/kernel/Makefile
View file

@ -46,7 +46,7 @@ obj-$(CONFIG_MICROCODE) += microcode.o
obj-$(CONFIG_PCI) += early-quirks.o
apm-y := apm_32.o
obj-$(CONFIG_APM) += apm.o
obj-$(CONFIG_X86_SMP) += smp_$(BITS).o smpboot_$(BITS).o tsc_sync.o
obj-$(CONFIG_X86_SMP) += smp_$(BITS).o smpboot_$(BITS).o smpboot.o tsc_sync.o
obj-$(CONFIG_X86_32_SMP) += smpcommon_32.o
obj-$(CONFIG_X86_64_SMP) += smp_64.o smpboot_64.o tsc_sync.o
obj-$(CONFIG_X86_TRAMPOLINE) += trampoline_$(BITS).o

53
arch/x86/kernel/smpboot.c Normal file
View file

@ -0,0 +1,53 @@
#include <linux/init.h>
#include <linux/smp.h>
#ifdef CONFIG_HOTPLUG_CPU
int additional_cpus __initdata = -1;
static __init int setup_additional_cpus(char *s)
{
return s && get_option(&s, &additional_cpus) ? 0 : -EINVAL;
}
early_param("additional_cpus", setup_additional_cpus);
/*
* cpu_possible_map should be static, it cannot change as cpu's
* are onlined, or offlined. The reason is per-cpu data-structures
* are allocated by some modules at init time, and dont expect to
* do this dynamically on cpu arrival/departure.
* cpu_present_map on the other hand can change dynamically.
* In case when cpu_hotplug is not compiled, then we resort to current
* behaviour, which is cpu_possible == cpu_present.
* - Ashok Raj
*
* Three ways to find out the number of additional hotplug CPUs:
* - If the BIOS specified disabled CPUs in ACPI/mptables use that.
* - The user can overwrite it with additional_cpus=NUM
* - Otherwise don't reserve additional CPUs.
* We do this because additional CPUs waste a lot of memory.
* -AK
*/
__init void prefill_possible_map(void)
{
int i;
int possible;
if (additional_cpus == -1) {
if (disabled_cpus > 0)
additional_cpus = disabled_cpus;
else
additional_cpus = 0;
}
possible = num_processors + additional_cpus;
if (possible > NR_CPUS)
possible = NR_CPUS;
printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
possible, max_t(int, possible - num_processors, 0));
for (i = 0; i < possible; i++)
cpu_set(i, cpu_possible_map);
}
#endif

51
arch/x86/kernel/smpboot_64.c
View file

@ -749,51 +749,6 @@ static __init void disable_smp(void)
cpu_set(0, per_cpu(cpu_core_map, 0));
}
#ifdef CONFIG_HOTPLUG_CPU
int additional_cpus __initdata = -1;
/*
* cpu_possible_map should be static, it cannot change as cpu's
* are onlined, or offlined. The reason is per-cpu data-structures
* are allocated by some modules at init time, and dont expect to
* do this dynamically on cpu arrival/departure.
* cpu_present_map on the other hand can change dynamically.
* In case when cpu_hotplug is not compiled, then we resort to current
* behaviour, which is cpu_possible == cpu_present.
* - Ashok Raj
*
* Three ways to find out the number of additional hotplug CPUs:
* - If the BIOS specified disabled CPUs in ACPI/mptables use that.
* - The user can overwrite it with additional_cpus=NUM
* - Otherwise don't reserve additional CPUs.
* We do this because additional CPUs waste a lot of memory.
* -AK
*/
__init void prefill_possible_map(void)
{
int i;
int possible;
if (additional_cpus == -1) {
if (disabled_cpus > 0)
additional_cpus = disabled_cpus;
else
additional_cpus = 0;
}
possible = num_processors + additional_cpus;
if (possible > NR_CPUS)
possible = NR_CPUS;
printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
possible,
max_t(int, possible - num_processors, 0));
for (i = 0; i < possible; i++)
cpu_set(i, cpu_possible_map);
}
#endif
/*
* Various sanity checks.
*/
@ -1087,12 +1042,6 @@ void __cpu_die(unsigned int cpu)
printk(KERN_ERR "CPU %u didn't die...\n", cpu);
}
static __init int setup_additional_cpus(char *s)
{
return s && get_option(&s, &additional_cpus) ? 0 : -EINVAL;
}
early_param("additional_cpus", setup_additional_cpus);
#else /* ... !CONFIG_HOTPLUG_CPU */
int __cpu_disable(void)

1
include/asm-x86/smp.h
View file

@ -63,6 +63,7 @@ void native_smp_cpus_done(unsigned int max_cpus);
int native_cpu_up(unsigned int cpunum);
extern unsigned disabled_cpus;
extern void prefill_possible_map(void);
#endif
#ifdef CONFIG_X86_32

1
include/asm-x86/smp_64.h
View file

@ -43,7 +43,6 @@ static inline int cpu_present_to_apicid(int mps_cpu)
extern int __cpu_disable(void);
extern void __cpu_die(unsigned int cpu);
extern void prefill_possible_map(void);
#define raw_smp_processor_id() read_pda(cpunumber)
#define cpu_physical_id(cpu) per_cpu(x86_cpu_to_apicid, cpu)