double increment of current->maj_flt

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in the case of mmaped accesses, the number of major faults is twice
that the real amount. ++current->maj_flt is done once by do_no_page() and
once by inode->readpage().
in case of access by read(), the number reported is correct, since only
inode->readpage() increments the count.
is this a bug or is it by design ?

ganesh

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