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>
98 lines
2.2 KiB
C
98 lines
2.2 KiB
C
#ifndef __ASM_SMP_H
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#define __ASM_SMP_H
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/*
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* We need the APIC definitions automatically as part of 'smp.h'
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*/
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#ifndef __ASSEMBLY__
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#include <linux/config.h>
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#include <linux/kernel.h>
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#include <linux/threads.h>
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#include <linux/cpumask.h>
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#endif
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#ifdef CONFIG_X86_LOCAL_APIC
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#ifndef __ASSEMBLY__
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#include <asm/fixmap.h>
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#include <asm/bitops.h>
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#include <asm/mpspec.h>
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#ifdef CONFIG_X86_IO_APIC
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#include <asm/io_apic.h>
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#endif
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#include <asm/apic.h>
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#endif
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#endif
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#define BAD_APICID 0xFFu
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#ifdef CONFIG_SMP
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#ifndef __ASSEMBLY__
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/*
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* Private routines/data
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*/
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extern void smp_alloc_memory(void);
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extern int pic_mode;
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extern int smp_num_siblings;
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extern cpumask_t cpu_sibling_map[];
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extern cpumask_t cpu_core_map[];
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extern void (*mtrr_hook) (void);
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extern void zap_low_mappings (void);
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extern void lock_ipi_call_lock(void);
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extern void unlock_ipi_call_lock(void);
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#define MAX_APICID 256
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extern u8 x86_cpu_to_apicid[];
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#ifdef CONFIG_HOTPLUG_CPU
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extern void cpu_exit_clear(void);
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extern void cpu_uninit(void);
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#endif
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/*
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* This function is needed by all SMP systems. It must _always_ be valid
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* from the initial startup. We map APIC_BASE very early in page_setup(),
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* so this is correct in the x86 case.
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*/
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#define raw_smp_processor_id() (current_thread_info()->cpu)
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extern cpumask_t cpu_callout_map;
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extern cpumask_t cpu_callin_map;
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extern cpumask_t cpu_possible_map;
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/* We don't mark CPUs online until __cpu_up(), so we need another measure */
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static inline int num_booting_cpus(void)
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{
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return cpus_weight(cpu_callout_map);
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}
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#ifdef CONFIG_X86_LOCAL_APIC
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#ifdef APIC_DEFINITION
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extern int hard_smp_processor_id(void);
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#else
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#include <mach_apicdef.h>
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static inline int hard_smp_processor_id(void)
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{
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/* we don't want to mark this access volatile - bad code generation */
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return GET_APIC_ID(*(unsigned long *)(APIC_BASE+APIC_ID));
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}
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#endif
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static __inline int logical_smp_processor_id(void)
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{
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/* we don't want to mark this access volatile - bad code generation */
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return GET_APIC_LOGICAL_ID(*(unsigned long *)(APIC_BASE+APIC_LDR));
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}
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#endif
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extern int __cpu_disable(void);
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extern void __cpu_die(unsigned int cpu);
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#endif /* !__ASSEMBLY__ */
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#define NO_PROC_ID 0xFF /* No processor magic marker */
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#endif
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#endif
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