4GB+DEBUG_PAGEALLOC oopses with 2.6.0-test3-mm1

[Manfred Spraul]

Hi Ingo,

I'm running into crashes in copy_mount_options with 
CONFIG_DEBUG_PAGEALLOC and 4GB in 2.6.0-test3-mm1:

The functions in mm/usercopy assume that no exception handling is 
required if fs is KERNEL_DS. This is not true: at least the mount 
options copy and the i386 traps handler assume exception handling with 
fs==KERNEL_DS.

How should this be fixed? I don't see a simple, portable way to 
implement exception handling for the kernel address space.

--
   Manfred

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