55 lines
1.2 KiB
C
Executable File
55 lines
1.2 KiB
C
Executable File
/* $Id: //BBN_Linux/Branch/Branch_for_Rel_TP_ASEAN_20161216/tclinux_phoenix/bootrom/bootram/include/asm/smplock.h#1 $
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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
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* for more details.
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*
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* Default SMP lock implementation
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*/
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#include <linux/interrupt.h>
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#include <linux/spinlock.h>
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extern spinlock_t kernel_flag;
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#define kernel_locked() spin_is_locked(&kernel_flag)
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/*
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* Release global kernel lock and global interrupt lock
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*/
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#define release_kernel_lock(task, cpu) \
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do { \
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if (task->lock_depth >= 0) \
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spin_unlock(&kernel_flag); \
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release_irqlock(cpu); \
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__sti(); \
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} while (0)
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/*
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* Re-acquire the kernel lock
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*/
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#define reacquire_kernel_lock(task) \
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do { \
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if (task->lock_depth >= 0) \
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spin_lock(&kernel_flag); \
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} while (0)
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/*
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* Getting the big kernel lock.
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*
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* This cannot happen asynchronously,
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* so we only need to worry about other
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* CPU's.
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*/
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extern __inline__ void lock_kernel(void)
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{
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if (!++current->lock_depth)
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spin_lock(&kernel_flag);
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}
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extern __inline__ void unlock_kernel(void)
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{
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if (--current->lock_depth < 0)
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spin_unlock(&kernel_flag);
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}
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