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SubjectBug in ioremap: boundary case is wrong
The x86 ioremap starts with

if(phys_addr > virt_to_phys(high_memory))
return phys_to_virt(phys_addr);

If you vremap an area whose end point is over the high_memory point your
memory mapping breaks. Surely it should be

if( phys_addr + size > ...)


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