On Sat, 19 Jan 2008, Anton Salikhmetov wrote:
>
> Before using pte_wrprotect() the vma_wrprotect() routine uses the
> pte_offset_map_lock() macro to get the PTE and to acquire the ptl
> spinlock. Why did you say that this code was not SMP-safe? It should
> be atomic, I think.
It's atomic WITH RESPECT TO OTHER PEOPLE WHO GET THE LOCK.
Guess how much another x86 CPU cares when it sets the accessed bit in
hardware?
> The POSIX standard requires the ctime and mtime stamps to be updated
> not later than at the second call to msync() with the MS_ASYNC flag.
.. and that is no excuse for bad code.
Linus
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