[Xen-devel] get_page put_page cmpxchg problem?

["King, Steven R" <steven.r.king@xxxxxxxxx>]

Hi Folks,

In -unstable (I haven't updated in a few days), I'm investigating a problem in which revalidate_l1() fails because get_page() fails due to a count_info of 0.  While that problem is still hanging over me, I did notice that get_page() in include/asm-x86/mm.h does a 64-bit cmpxchg while put_page() only does a 32-bit cmpxchg.  Seemed odd to me and possibly related to my bug.    I'm running on a 32-bit machine without shadow tables.

 

Can anyone offer an explanation?

 

Thanks for your time,

-steve

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