linux-kernel - why are some atomic_t's not volatile, while most are?

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Date:	Sun, 1 Jul 2007 08:49:37 -0400 (EDT)
From:	"Robert P. J. Day" <rpjday@...dspring.com>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: why are some atomic_t's not volatile, while most are?

  prompted by the earlier post on "volatile"s, is there a reason that
most atomic_t typedefs use volatile int's, while the rest don't?

$ grep "typedef.*struct"  $(find . -name atomic.h)
./include/asm-v850/atomic.h:typedef struct { int counter; } atomic_t;
./include/asm-mips/atomic.h:typedef struct { volatile int counter; } atomic_t;
./include/asm-mips/atomic.h:typedef struct { volatile long counter; } atomic64_t;
...

  etc, etc.  just curious.

rday
-- 
========================================================================
Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry
Waterloo, Ontario, CANADA

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