include/linux/bottom_half.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_BH_H
   3 #define _LINUX_BH_H
   4
   5 #include <linux/instruction_pointer.h>
   6 #include <linux/preempt.h>
   7
   8 #if defined(CONFIG_PREEMPT_RT) || defined(CONFIG_TRACE_IRQFLAGS)
   9 extern void __local_bh_disable_ip(unsigned long ip, unsigned int cnt);
  10 #else
  11 static __always_inline void __local_bh_disable_ip(unsigned long ip, unsigned int cnt)
  12 {
  13         preempt_count_add(cnt);
  14         barrier();
  15 }
  16 #endif
  17
  18 static inline void local_bh_disable(void)
  19 {
  20         __local_bh_disable_ip(_THIS_IP_, SOFTIRQ_DISABLE_OFFSET);
  21 }
  22
  23 extern void _local_bh_enable(void);
  24 extern void __local_bh_enable_ip(unsigned long ip, unsigned int cnt);
  25
  26 static inline void local_bh_enable_ip(unsigned long ip)
  27 {
  28         __local_bh_enable_ip(ip, SOFTIRQ_DISABLE_OFFSET);
  29 }
  30
  31 static inline void local_bh_enable(void)
  32 {
  33         __local_bh_enable_ip(_THIS_IP_, SOFTIRQ_DISABLE_OFFSET);
  34 }
  35
  36 #ifdef CONFIG_PREEMPT_RT
  37 extern bool local_bh_blocked(void);
  38 #else
  39 static inline bool local_bh_blocked(void) { return false; }
  40 #endif
  41
  42 #endif /* _LINUX_BH_H */