0bd3a173d7
Currently local_bh_disable() is out-of-line for no apparent reason.
So inline it to save a few cycles on call/return nonsense, the
function body is a single add on x86 (a few loads and store extra on
load/store archs).
Also expose two new local_bh functions:
__local_bh_{dis,en}able_ip(unsigned long ip, unsigned int cnt);
Which implement the actual local_bh_{dis,en}able() behaviour.
The next patch uses the exposed @cnt argument to optimize bh lock
functions.
With build fixes from Jacob Pan.
Cc: rjw@rjwysocki.net
Cc: rui.zhang@intel.com
Cc: jacob.jun.pan@linux.intel.com
Cc: Mike Galbraith <bitbucket@online.de>
Cc: hpa@zytor.com
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: lenb@kernel.org
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20131119151338.GF3694@twins.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
81 lines
1.7 KiB
C
81 lines
1.7 KiB
C
#ifndef LINUX_HARDIRQ_H
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#define LINUX_HARDIRQ_H
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#include <linux/preempt_mask.h>
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#include <linux/lockdep.h>
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#include <linux/ftrace_irq.h>
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#include <linux/vtime.h>
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#include <asm/hardirq.h>
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extern void synchronize_irq(unsigned int irq);
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#if defined(CONFIG_TINY_RCU)
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static inline void rcu_nmi_enter(void)
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{
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}
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static inline void rcu_nmi_exit(void)
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{
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}
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#else
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extern void rcu_nmi_enter(void);
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extern void rcu_nmi_exit(void);
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#endif
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/*
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* It is safe to do non-atomic ops on ->hardirq_context,
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* because NMI handlers may not preempt and the ops are
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* always balanced, so the interrupted value of ->hardirq_context
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* will always be restored.
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*/
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#define __irq_enter() \
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do { \
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account_irq_enter_time(current); \
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preempt_count_add(HARDIRQ_OFFSET); \
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trace_hardirq_enter(); \
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} while (0)
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/*
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* Enter irq context (on NO_HZ, update jiffies):
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*/
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extern void irq_enter(void);
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/*
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* Exit irq context without processing softirqs:
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*/
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#define __irq_exit() \
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do { \
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trace_hardirq_exit(); \
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account_irq_exit_time(current); \
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preempt_count_sub(HARDIRQ_OFFSET); \
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} while (0)
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/*
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* Exit irq context and process softirqs if needed:
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*/
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extern void irq_exit(void);
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#define nmi_enter() \
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do { \
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lockdep_off(); \
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ftrace_nmi_enter(); \
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BUG_ON(in_nmi()); \
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preempt_count_add(NMI_OFFSET + HARDIRQ_OFFSET); \
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rcu_nmi_enter(); \
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trace_hardirq_enter(); \
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} while (0)
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#define nmi_exit() \
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do { \
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trace_hardirq_exit(); \
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rcu_nmi_exit(); \
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BUG_ON(!in_nmi()); \
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preempt_count_sub(NMI_OFFSET + HARDIRQ_OFFSET); \
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ftrace_nmi_exit(); \
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lockdep_on(); \
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} while (0)
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#endif /* LINUX_HARDIRQ_H */
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