the difference between irq save and the irq disable ?

the difference between irq save and the irq disable ?

[mandy london]

in my mind, irq save only store the conditions of that time ,  and the
following code can access the shared region and change it ,so modify 
irq  states .

while , disable irq  keeps the states of interrupt unchangable .

but , I have no knowlege of the difference between code in irq save
and irq restore and  in irq disable and irq enable ?

whethe the former can be interrupted and the later not ? only this ?

Re: the difference between irq save and the irq disable ?

[Tushar Adeshara]

On 9/5/05, mandy london <laborious.bee@gmail.com> wrote:
> in my mind, irq save only store the conditions of that time ,  and the
> following code can access the shared region and change it ,so modify
> irq  states .
> 
> while , disable irq  keeps the states of interrupt unchangable .
> 
> but , I have no knowlege of the difference between code in irq save
> and irq restore and  in irq disable and irq enable ?
> 
> whethe the former can be interrupted and the later not ? only this ?

Have a look at Documentaion/cli-sti-removal.txt. As per that,
irq_enable will enable all irqs and irq_restore will bring irq status
to the one it was
before irq_save.
                            And as per my knowledge, non are
interruptible except case of RT.

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-- 
Regards,
Tushar
--------------------
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