mm: Handle 0 flags in _calc_vm_trans() macro
_calc_vm_trans() does not handle the situation when some of the passed flags are 0 (which can happen if these VM flags do not make sense for the architecture). Improve the _calc_vm_trans() macro to return 0 in such situation. Since all passed flags are constant, this does not add any runtime overhead. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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@ -63,8 +63,9 @@ static inline bool arch_validate_prot(unsigned long prot)
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* ("bit1" and "bit2" must be single bits)
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*/
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#define _calc_vm_trans(x, bit1, bit2) \
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((!(bit1) || !(bit2)) ? 0 : \
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((bit1) <= (bit2) ? ((x) & (bit1)) * ((bit2) / (bit1)) \
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: ((x) & (bit1)) / ((bit1) / (bit2)))
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: ((x) & (bit1)) / ((bit1) / (bit2))))
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/*
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* Combine the mmap "prot" argument into "vm_flags" used internally.
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