[PATCH] Document Linux's memory barriers

Paul Mackerras paulus at samba.org
Thu Mar 9 09:06:05 EST 2006

Duncan Sands writes:

> On UP you at least need compiler barriers, right?  You're in trouble if you think
> you are writing in a certain order, and expect to see the same order from an
> interrupt handler, but the compiler decided to rearrange the order of the writes...

I'd be interested to know what the C standard says about whether the
compiler can reorder writes that may be visible to a signal handler.
An interrupt handler in the kernel is logically equivalent to a signal
handler in normal C code.

Surely there are some C language lawyers on one of the lists that this
thread is going to?


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