Re: [RESEND] [PATCH] VFS: make file->f_pos access atomic on 32bit arch

Andi Kleen
2008-10-07T10:23:46Z

> Maybe cmpxchg8b is good for i486 or later x86, but i386 or other architectures
> that do not have similar instruction needs some locking primitive. I think lazy

We have a cmpxchg emulation on 386. That works because only UP 386s are
supported, so it can be done in software.

> seqlock is one option for making file->f_pos access atomic.

The question is if it's the right option. At least all the common
operations on fds (read/write) are all writers, not readers.

-Andi

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ak@linux.intel.com