linux-kernel - question about irq_enter()/irq

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Date:   Tue, 29 Nov 2016 17:47:12 -0600
From:   Grygorii Strashko <grygorii.strashko@...com>
To:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-rt-users@...r.kernel.org>
Subject: question about irq_enter()/irq_exit() calling policy

Hi All,

Sorry for the may be dumb question, but what is the calling policy for irq_enter()/irq_exit()?

1) Should these function be called each time system enter/exit IRQ context?

HW IRQ:
 switch (IRQ mode)
  ...
  irq_enter()
	handle irq - execute hw_irq_hadler
  irq_exit()
  ...
 switch

2) Should these function be called for each processed irq?


HW IRQ:
 switch (IRQ mode)
  ...
  while (irq = get_pending_irq()) {
  	...
  	irq_enter()
		handle(irq) - execute hw_irq_hadler
  	irq_exit()
 }
 ...
 switch

-- 
regards,
-grygorii