forked from luck/tmp_suning_uos_patched
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>
36 lines
796 B
C
36 lines
796 B
C
#ifndef _LINUX_BH_H
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#define _LINUX_BH_H
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#include <linux/preempt.h>
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#include <linux/preempt_mask.h>
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#ifdef CONFIG_TRACE_IRQFLAGS
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extern void __local_bh_disable_ip(unsigned long ip, unsigned int cnt);
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#else
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static __always_inline void __local_bh_disable_ip(unsigned long ip, unsigned int cnt)
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{
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preempt_count_add(cnt);
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barrier();
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}
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#endif
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static inline void local_bh_disable(void)
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{
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__local_bh_disable_ip(_THIS_IP_, SOFTIRQ_DISABLE_OFFSET);
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}
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extern void _local_bh_enable(void);
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extern void __local_bh_enable_ip(unsigned long ip, unsigned int cnt);
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static inline void local_bh_enable_ip(unsigned long ip)
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{
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__local_bh_enable_ip(ip, SOFTIRQ_DISABLE_OFFSET);
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}
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static inline void local_bh_enable(void)
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{
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__local_bh_enable_ip(_THIS_IP_, SOFTIRQ_DISABLE_OFFSET);
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}
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#endif /* _LINUX_BH_H */
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