kernel mailz <kernelma...@googlemail.com> writes:
> I tried a small example
>
> int *p = 0x1000;
> int a = *p;
> asm("sync":::"memory");
> a = *p;
>
> and
>
> volatile int *p = 0x1000;
> int a = *p;
> asm("sync");
> a = *p
>
> Got the same assembly.
> Which is right.
>
> So does it mean, if proper use of volatile is done, there is no need
> of "memory" ?
You have to consider the effects of inlining, which may bring in other
memory loads and stores through non-volatile pointers.
Ian
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