mirror of
https://github.com/torvalds/linux.git
synced 2024-12-13 14:43:03 +00:00
4ad8d38342
for_each_cpu walks through all processors in cpu_possible_map, which is defined as cpu_callout_map on i386 and isn't initialised until all processors have been booted. This breaks things which do for_each_cpu iterations early during boot. So, define cpu_possible_map as a bitmap with NR_CPUS bits populated. This was triggered by a patch i'm working on which does alloc_percpu before bringing up secondary processors. From: Alexander Nyberg <alexn@telia.com> i386-boottime-for_each_cpu-broken.patch i386-boottime-for_each_cpu-broken-fix.patch The SMP version of __alloc_percpu checks the cpu_possible_map before allocating memory for a certain cpu. With the above patches the BSP cpuid is never set in cpu_possible_map which breaks CONFIG_SMP on uniprocessor machines (as soon as someone tries to dereference something allocated via __alloc_percpu, which in fact is never allocated since the cpu is not set in cpu_possible_map). Signed-off-by: Zwane Mwaikambo <zwane@arm.linux.org.uk> Signed-off-by: Alexander Nyberg <alexn@telia.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
99 lines
2.2 KiB
C
99 lines
2.2 KiB
C
#ifndef __ASM_SMP_H
|
|
#define __ASM_SMP_H
|
|
|
|
/*
|
|
* We need the APIC definitions automatically as part of 'smp.h'
|
|
*/
|
|
#ifndef __ASSEMBLY__
|
|
#include <linux/config.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/threads.h>
|
|
#include <linux/cpumask.h>
|
|
#endif
|
|
|
|
#ifdef CONFIG_X86_LOCAL_APIC
|
|
#ifndef __ASSEMBLY__
|
|
#include <asm/fixmap.h>
|
|
#include <asm/bitops.h>
|
|
#include <asm/mpspec.h>
|
|
#ifdef CONFIG_X86_IO_APIC
|
|
#include <asm/io_apic.h>
|
|
#endif
|
|
#include <asm/apic.h>
|
|
#endif
|
|
#endif
|
|
|
|
#define BAD_APICID 0xFFu
|
|
#ifdef CONFIG_SMP
|
|
#ifndef __ASSEMBLY__
|
|
|
|
/*
|
|
* Private routines/data
|
|
*/
|
|
|
|
extern void smp_alloc_memory(void);
|
|
extern int pic_mode;
|
|
extern int smp_num_siblings;
|
|
extern cpumask_t cpu_sibling_map[];
|
|
extern cpumask_t cpu_core_map[];
|
|
|
|
extern void (*mtrr_hook) (void);
|
|
extern void zap_low_mappings (void);
|
|
extern void lock_ipi_call_lock(void);
|
|
extern void unlock_ipi_call_lock(void);
|
|
|
|
#define MAX_APICID 256
|
|
extern u8 x86_cpu_to_apicid[];
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
extern void cpu_exit_clear(void);
|
|
extern void cpu_uninit(void);
|
|
#endif
|
|
|
|
/*
|
|
* This function is needed by all SMP systems. It must _always_ be valid
|
|
* from the initial startup. We map APIC_BASE very early in page_setup(),
|
|
* so this is correct in the x86 case.
|
|
*/
|
|
#define raw_smp_processor_id() (current_thread_info()->cpu)
|
|
|
|
extern cpumask_t cpu_callout_map;
|
|
extern cpumask_t cpu_callin_map;
|
|
extern cpumask_t cpu_possible_map;
|
|
|
|
/* We don't mark CPUs online until __cpu_up(), so we need another measure */
|
|
static inline int num_booting_cpus(void)
|
|
{
|
|
return cpus_weight(cpu_callout_map);
|
|
}
|
|
|
|
#ifdef CONFIG_X86_LOCAL_APIC
|
|
|
|
#ifdef APIC_DEFINITION
|
|
extern int hard_smp_processor_id(void);
|
|
#else
|
|
#include <mach_apicdef.h>
|
|
static inline int hard_smp_processor_id(void)
|
|
{
|
|
/* we don't want to mark this access volatile - bad code generation */
|
|
return GET_APIC_ID(*(unsigned long *)(APIC_BASE+APIC_ID));
|
|
}
|
|
#endif
|
|
|
|
static __inline int logical_smp_processor_id(void)
|
|
{
|
|
/* we don't want to mark this access volatile - bad code generation */
|
|
return GET_APIC_LOGICAL_ID(*(unsigned long *)(APIC_BASE+APIC_LDR));
|
|
}
|
|
|
|
#endif
|
|
|
|
extern int __cpu_disable(void);
|
|
extern void __cpu_die(unsigned int cpu);
|
|
#endif /* !__ASSEMBLY__ */
|
|
|
|
#define NO_PROC_ID 0xFF /* No processor magic marker */
|
|
|
|
#endif
|
|
#endif
|