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

From: Ming Lei
Date: Mon Dec 17 2012 - 20:41:29 EST

On Tue, Dec 18, 2012 at 9:10 AM, Andy Lutomirski <luto@xxxxxxxxxxxxxx> 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.

See below in include/linux/types.h

typedef struct {
int counter;
} atomic_t;

#ifdef CONFIG_64BIT
typedef struct {
long counter;
} atomic64_t;

Ming Lei
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