Messages in this thread | | | Date | Wed, 9 May 2007 11:43:05 +0200 | From | Johannes Stezenbach <> | Subject | Re: [RFC/PATCH] doc: volatile considered evil |
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On Tue, May 08, 2007, Jonathan Corbet wrote: > > I just took a shot at turning this into something more like a normal > document: > > http://lwn.net/Articles/233479/
I think the "jiffies variable is special" part misses the "for stupid legacy reasons" explanation.
According to the other volatile rules one should use something like that:
extern unsigned long __jiffies; static inline unsigned long read_ulong(unsigned long *addr) { return *(volatile unsigned long *)addr; } static inline unsigned long get_jiffies(void) { return read_ulong(&__jiffies); }
But of course changing all references to jiffies in the kernel would be insane, thus jiffies is special "for stupid legacy reasons".
Right?
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