I understand the old sli/sti interface should no
longer be used :
unsigned long flags;
save_flags(flags);
cli();
/* critical section .
restore_flags(flags);
and should be replaced by the spinlock interface
spinlock_t mr_lock = SPIN_LOCK_UNLOCKED;
unsigned long flags;
spin_lock_irqsave(&mr_lock, flags);
/* critical section ... */
spin_unlock_irqrestore(&mr_lock, flags)
but I am working with a few different drivers (some of
which I didn't write). They are using gpio ports on a
embedded arm processor. My critial code would set a
single bit in a port (the other modules use other bits
in the same port) i.e.:
outl(inl(XXXX_PORT) | XXXX_MASK, XXXX_PORT);
If I use the spinlocks, the spinlock_t mr_lock is not
availble in all the modules.... so do I have a locking
problem? how should I code this ?
Thanks in advance.
unsigned long flags;
save_flags(flags);
cli();
/* critical section .
restore_flags(flags);
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