On 6/7/07, keshetti85-linux@xxxxxxxxxxx <keshetti85-linux@xxxxxxxxxxx
> wrote:
This helps prevent deadlocks where the code is potentially accessed from interrupt context also.
Actually spin_lock_irqsave saves the current interrupt flags, and ALSO disables interrupts.
"local_irq_save" - which is called by spin_lock_irqsave - has the "cli" instruction which does the disabling part.
Spinlocks are used in the kernel only, so I kinda missed the point here. Can you rephrase?
Bhanu.
-- Hi list,
Can anybody tell me what is the intended use of the spin_lock_irqsave?
This helps prevent deadlocks where the code is potentially accessed from interrupt context also.
The only extra thing spn_lock_irqsave does when compared to spin_lock_irq is,
it saves the current context(?) in some variable. But why is it required at all?
Actually spin_lock_irqsave saves the current interrupt flags, and ALSO disables interrupts.
"local_irq_save" - which is called by spin_lock_irqsave - has the "cli" instruction which does the disabling part.
Isn't it done by the kernel??
Spinlocks are used in the kernel only, so I kinda missed the point here. Can you rephrase?
Thanks and regards,
Mahesh.
Bhanu.
The box said "Requires Windows Vista or better." So I installed LINUX
