some questions about flush_map() in pageattr.c

some questions about flush_map() in pageattr.c

[Thomas Schlichter]

Hello,

currently I am writing a patch to be able to make TLBs on any IO-devices 
coherent to the CPUs TLBs. So I was looking in the kernel-sources for places 
where not only the local but all TLBs are flushed. So I came up with 
flush_map() in the arch/i386/mm/ and the arch/x86_64/mm/ directories.

Now my questions:

1. In the x86_64 part of code the flush_kernel_map() does a 
local_flush_tlb_one() but in the i386 parts a local_flush_tlb_all(). Is the 
mentioned athlon bug the cause or can it be changed to work as in the x86_64 
code?

2. Can the flush_map() function be replaced by a flush_tlb_all() respective 
flush_tlb_page(). If I can do so, what would be the correct value for the 
first argument 'vma'?

If it is not posible could you please tell me why not...?

Thank you very much!

  Thomas Schlichter