Are there u32 atomic bitops? (or dealing w/ i_flags)

From: Andy Lutomirski
Date: Mon Dec 17 2012 - 20:15:42 EST

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.

What should I do? Suck it up and waste four bytes on 64-bit machines?

In general, having atomic flag words be long seems likely to waste
bits on 64-bit architectures.

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