Messages in this thread | | | Date | Tue, 18 Dec 2012 01:57:05 +0000 | From | Al Viro <> | Subject | Re: Are there u32 atomic bitops? (or dealing w/ i_flags) |
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On Mon, Dec 17, 2012 at 05:10:21PM -0800, Andy Lutomirski wrote: > I want to change inode->i_flags access to be atomic -- there are some > locking oddities right now, I think, and I want to use a new inode > flag to signal mtime updates from page_mkwrite. The problem is that > i_flags is an unsigned int, and making it an unsigned long seems like > a waste, but there aren't any u32 atomic bitops.
... and atomic accesses cost more. A lot more on some architectures. FWIW, atomic_t *is* 32bit on 32bit architectures, which still doesn't make it a good idea.
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