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39c715b717
This patch implements a number of smp_processor_id() cleanup ideas that
Arjan van de Ven and I came up with.
The previous __smp_processor_id/_smp_processor_id/smp_processor_id API
spaghetti was hard to follow both on the implementational and on the
usage side.
Some of the complexity arose from picking wrong names, some of the
complexity comes from the fact that not all architectures defined
__smp_processor_id.
In the new code, there are two externally visible symbols:
- smp_processor_id(): debug variant.
- raw_smp_processor_id(): nondebug variant. Replaces all existing
uses of _smp_processor_id() and __smp_processor_id(). Defined
by every SMP architecture in include/asm-*/smp.h.
There is one new internal symbol, dependent on DEBUG_PREEMPT:
- debug_smp_processor_id(): internal debug variant, mapped to
smp_processor_id().
Also, i moved debug_smp_processor_id() from lib/kernel_lock.c into a new
lib/smp_processor_id.c file. All related comments got updated and/or
clarified.
I have build/boot tested the following 8 .config combinations on x86:
{SMP,UP} x {PREEMPT,!PREEMPT} x {DEBUG_PREEMPT,!DEBUG_PREEMPT}
I have also build/boot tested x64 on UP/PREEMPT/DEBUG_PREEMPT. (Other
architectures are untested, but should work just fine.)
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
73 lines
1.6 KiB
C
73 lines
1.6 KiB
C
/*
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* linux/include/asm-arm/smp.h
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*
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* Copyright (C) 2004-2005 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ASM_ARM_SMP_H
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#define __ASM_ARM_SMP_H
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#include <linux/config.h>
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#include <linux/threads.h>
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#include <linux/cpumask.h>
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#include <linux/thread_info.h>
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#include <asm/arch/smp.h>
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#ifndef CONFIG_SMP
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# error "<asm-arm/smp.h> included in non-SMP build"
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#endif
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#define raw_smp_processor_id() (current_thread_info()->cpu)
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extern cpumask_t cpu_present_mask;
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#define cpu_possible_map cpu_present_mask
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/*
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* at the moment, there's not a big penalty for changing CPUs
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* (the >big< penalty is running SMP in the first place)
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*/
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#define PROC_CHANGE_PENALTY 15
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struct seq_file;
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/*
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* generate IPI list text
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*/
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extern void show_ipi_list(struct seq_file *p);
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/*
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* Move global data into per-processor storage.
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*/
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extern void smp_store_cpu_info(unsigned int cpuid);
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/*
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* Raise an IPI cross call on CPUs in callmap.
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*/
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extern void smp_cross_call(cpumask_t callmap);
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/*
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* Boot a secondary CPU, and assign it the specified idle task.
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* This also gives us the initial stack to use for this CPU.
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*/
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extern int boot_secondary(unsigned int cpu, struct task_struct *);
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/*
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* Perform platform specific initialisation of the specified CPU.
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*/
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extern void platform_secondary_init(unsigned int cpu);
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/*
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* Initial data for bringing up a secondary CPU.
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*/
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struct secondary_data {
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unsigned long pgdir;
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void *stack;
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};
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extern struct secondary_data secondary_data;
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#endif /* ifndef __ASM_ARM_SMP_H */
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