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Date: Thu, 07 Jun 2007 17:31:18 +0200 From: Stefan Richter <stefanr@...6.in-berlin.de> To: "Robert P. J. Day" <rpjday@...dspring.com> CC: Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: why is it called "asm-generic/atomic.h"? Robert P. J. Day wrote: > i'm just curious -- why does that particular header file have that > name? its opening comment reads: > > * Allows to provide arch independent atomic definitions without the need to > * edit all arch specific atomic.h files. > > but that's *not* what that header file does. The file name is correct, and the comment is correct too. It indeed _allows_ to define architecture-independent operations on atomic types, and it currently does so for atomic_long_t. There is no need to do so for atomic_t, because all architectures already had their own set of atomic_t operations when asm-generic/atomic.h was added. (And I presume they varied too much to justify an additional generic implementation plus #ifndef HAVE_ARCH_SOMETHING games.) PS: The atomic_long_t operations currently don't need to be protected by #ifndef HAVE_ARCH_SOMETHING and won't need to be in foreseeable future, therefore they don't have this protection. -- Stefan Richter -=====-=-=== -==- --=== http://arcgraph.de/sr/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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