Messages in this thread | | | From | Paul Mackerras <> | Date | Thu, 12 Dec 2002 08:12:24 +1100 | Subject | Re: [PATCH] dm.c - device-mapper I/O path fixes |
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Kevin Corry writes:
> Storing an int is *not* atomic unless it is declared as atomic_t and you use > the appropriate macros (see include/asm-*/atomic.h). Remember, we are talking > about a field in a data structure that can be accessed from multiple threads > on multiple CPUs.
As a practical matter, I believe that storing an int to an int-aligned address _is_ actually atomic on any CPU that can run Linux. The PowerPC architecture spec requires that single-word (i.e. 32-bit) aligned stores are atomic, for instance, and I think that would be the case on any other sane architecture as well.
The language lawyers would probably agree with you, though.
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