Messages in this thread |  | | From | Sven Eckelmann <> | | Subject | Range of 24/32 bit for atomic_t since 2.6.3 | | Date | Mon, 26 Apr 2010 11:31:19 +0200 |
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Hi,
currently arch/mn10300/include/asm/atomic.h and include/asm-generic/atomic.h warns right before atomic_read/atomic_set/atomic_add_return/ atomic_sub_return that atomic_t only guarantees a useful range of 24 bits. Documentation/atomic_ops.txt informs about the historical reason why this was true for 32-bit Sparc - something that was changes in linux 2.6.3 using a hash array with spinlocks [1].
Is it save to assume that atomic_t provides us the full range of 32 bit after 2.6.3 and can those statements in both atomic.h be removed?
Kind regards, Sven Eckelmann
[1] http://lwn.net/Articles/71732/ [unhandled content-type:application/pgp-signature] |  |