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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>
48 lines
1,009 B
C
48 lines
1,009 B
C
/*
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* include/asm-sh/smp.h
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*
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* Copyright (C) 2002, 2003 Paul Mundt
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive for
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* more details.
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*/
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#ifndef __ASM_SH_SMP_H
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#define __ASM_SH_SMP_H
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#include <linux/config.h>
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#include <linux/bitops.h>
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#include <linux/cpumask.h>
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#ifdef CONFIG_SMP
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#include <asm/spinlock.h>
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#include <asm/atomic.h>
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#include <asm/current.h>
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extern cpumask_t cpu_online_map;
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extern cpumask_t cpu_possible_map;
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#define cpu_online(cpu) cpu_isset(cpu, cpu_online_map)
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#define raw_smp_processor_id() (current_thread_info()->cpu)
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/* I've no idea what the real meaning of this is */
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#define PROC_CHANGE_PENALTY 20
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#define NO_PROC_ID (-1)
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struct smp_fn_call_struct {
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spinlock_t lock;
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atomic_t finished;
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void (*fn)(void *);
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void *data;
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};
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extern struct smp_fn_call_struct smp_fn_call;
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#define SMP_MSG_RESCHEDULE 0x0001
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#endif /* CONFIG_SMP */
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#endif /* __ASM_SH_SMP_H */
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