Re: [PATCH -v2 14/33] locking,m68k: Implement atomic_fetch_{add,sub,and,or,xor}()

Andreas Schwab
2016-06-16T12:43:29Z

Peter Zijlstra <peterz@infradead.org> writes:

> On Thu, Jun 16, 2016 at 12:08:27PM +0200, Geert Uytterhoeven wrote:
>
>> > #ifdef CONFIG_RMW_INSNS
>> >
>> > +/*
>> > + * Am I reading these CAS loops right in that %2 is the old value and the first
>> > + * iteration uses an uninitialized value?
>> > + *
>> > + * Would it not make sense to add: tmp = atomic_read(v); to avoid this?
>> > + */
>> > +
>> > #define ATOMIC_OP_RETURN(op, c_op, asm_op) \
>> > static inline int atomic_##op##_return(int i, atomic_t *v) \
>> > { \
>>
>> Do we want the above comment in the code?
>
> I figured it would not hurt; is this indeed the case, do we want to fix
> it?

No, there is nothing to fix here.

Andreas.

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Andreas Schwab, schwab@linux-m68k.org
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