f037360f2e
a) in smp_lock.h #include of sched.h and spinlock.h moved under #ifdef CONFIG_LOCK_KERNEL. b) interrupt.h now explicitly pulls sched.h (not via smp_lock.h from hardirq.h as it used to) c) in three more places we need changes to compensate for (a) - one place in arch/sparc needs string.h now, hardirq.h needs forward declaration of task_struct and preempt.h needs direct include of thread_info.h. d) thread_info-related helpers in sched.h and thread_info.h put under ifndef __HAVE_THREAD_FUNCTIONS. Obviously safe. Signed-off-by: Al Viro <viro@parcelfarce.linux.theplanet.co.uk> Signed-off-by: Roman Zippel <zippel@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
64 lines
1.4 KiB
C
64 lines
1.4 KiB
C
#ifndef __LINUX_PREEMPT_H
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#define __LINUX_PREEMPT_H
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/*
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* include/linux/preempt.h - macros for accessing and manipulating
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* preempt_count (used for kernel preemption, interrupt count, etc.)
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*/
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#include <linux/config.h>
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#include <linux/thread_info.h>
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#include <linux/linkage.h>
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#ifdef CONFIG_DEBUG_PREEMPT
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extern void fastcall add_preempt_count(int val);
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extern void fastcall sub_preempt_count(int val);
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#else
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# define add_preempt_count(val) do { preempt_count() += (val); } while (0)
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# define sub_preempt_count(val) do { preempt_count() -= (val); } while (0)
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#endif
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#define inc_preempt_count() add_preempt_count(1)
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#define dec_preempt_count() sub_preempt_count(1)
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#define preempt_count() (current_thread_info()->preempt_count)
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#ifdef CONFIG_PREEMPT
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asmlinkage void preempt_schedule(void);
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#define preempt_disable() \
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do { \
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inc_preempt_count(); \
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barrier(); \
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} while (0)
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#define preempt_enable_no_resched() \
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do { \
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barrier(); \
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dec_preempt_count(); \
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} while (0)
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#define preempt_check_resched() \
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do { \
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if (unlikely(test_thread_flag(TIF_NEED_RESCHED))) \
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preempt_schedule(); \
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} while (0)
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#define preempt_enable() \
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do { \
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preempt_enable_no_resched(); \
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preempt_check_resched(); \
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} while (0)
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#else
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#define preempt_disable() do { } while (0)
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#define preempt_enable_no_resched() do { } while (0)
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#define preempt_enable() do { } while (0)
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#define preempt_check_resched() do { } while (0)
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#endif
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#endif /* __LINUX_PREEMPT_H */
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