linux-kernel - Re: Are there u32 atomic bitops? (or dealing w/ i

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Message-ID: <CACVXFVNQvwHvJcSzqKv27MH_RgM=e0VvXkLPKCB0i3=Z9_9EXg@mail.gmail.com>
Date:	Tue, 18 Dec 2012 09:34:17 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	linux-kernel@...r.kernel.org,
	Linux FS Devel <linux-fsdevel@...r.kernel.org>
Subject: Re: Are there u32 atomic bitops? (or dealing w/ i_flags)

On Tue, Dec 18, 2012 at 9:10 AM, Andy Lutomirski <luto@...capital.net> 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;
#endif



Thanks,
-- 
Ming Lei
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