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https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
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0835761129
This is from an earlier message from 'Christoph Lameter':
cpu_core_map is currently an array defined using NR_CPUS. This means that
we overallocate since we will rarely really use maximum configured cpu.
If we put the cpu_core_map into the per cpu area then it will be allocated
for each processor as it comes online.
This means that the core map cannot be accessed until the per cpu area
has been allocated. Xen does a weird thing here looping over all processors
and zeroing the masks that are not yet allocated and that will be zeroed
when they are allocated. I commented the code out.
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Mike Travis <travis@sgi.com>
Cc: Andi Kleen <ak@suse.de>
Cc: Christoph Lameter <clameter@sgi.com>
Cc: "Siddha, Suresh B" <suresh.b.siddha@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
122 lines
2.8 KiB
C
122 lines
2.8 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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#include <linux/threads.h>
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#include <linux/cpumask.h>
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#include <linux/bitops.h>
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#include <linux/init.h>
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extern int disable_apic;
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#include <asm/mpspec.h>
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#include <asm/apic.h>
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#include <asm/io_apic.h>
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#include <asm/thread_info.h>
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#ifdef CONFIG_SMP
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#include <asm/pda.h>
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struct pt_regs;
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extern cpumask_t cpu_present_mask;
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extern cpumask_t cpu_possible_map;
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extern cpumask_t cpu_online_map;
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extern cpumask_t cpu_callout_map;
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extern cpumask_t cpu_initialized;
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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 volatile unsigned long smp_invalidate_needed;
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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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extern int smp_num_siblings;
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extern void smp_send_reschedule(int cpu);
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extern cpumask_t cpu_sibling_map[NR_CPUS];
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/*
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* cpu_core_map lives in a per cpu area
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*
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* extern cpumask_t cpu_core_map[NR_CPUS];
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*/
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DECLARE_PER_CPU(cpumask_t, cpu_core_map);
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extern u8 cpu_llc_id[NR_CPUS];
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#define SMP_TRAMPOLINE_BASE 0x6000
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/*
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* On x86 all CPUs are mapped 1:1 to the APIC space.
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* This simplifies scheduling and IPI sending and
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* compresses data structures.
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*/
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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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#define raw_smp_processor_id() read_pda(cpunumber)
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extern int __cpu_disable(void);
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extern void __cpu_die(unsigned int cpu);
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extern void prefill_possible_map(void);
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extern unsigned num_processors;
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extern unsigned __cpuinitdata disabled_cpus;
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#define NO_PROC_ID 0xFF /* No processor magic marker */
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#endif /* CONFIG_SMP */
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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 int *)(APIC_BASE+APIC_ID));
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}
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/*
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* Some lowlevel functions might want to know about
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* the real APIC ID <-> CPU # mapping.
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*/
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extern u8 x86_cpu_to_apicid[NR_CPUS]; /* physical ID */
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extern u8 x86_cpu_to_log_apicid[NR_CPUS];
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extern u8 bios_cpu_apicid[];
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static inline int cpu_present_to_apicid(int mps_cpu)
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{
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if (mps_cpu < NR_CPUS)
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return (int)bios_cpu_apicid[mps_cpu];
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else
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return BAD_APICID;
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}
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#ifndef CONFIG_SMP
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#define stack_smp_processor_id() 0
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#define cpu_logical_map(x) (x)
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#else
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#include <asm/thread_info.h>
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#define stack_smp_processor_id() \
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({ \
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struct thread_info *ti; \
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__asm__("andq %%rsp,%0; ":"=r" (ti) : "0" (CURRENT_MASK)); \
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ti->cpu; \
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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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#ifdef CONFIG_SMP
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#define cpu_physical_id(cpu) x86_cpu_to_apicid[cpu]
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#else
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#define cpu_physical_id(cpu) boot_cpu_id
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#endif /* !CONFIG_SMP */
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#endif
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