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Subjectwhy does the macro "ZERO_PAGE" take an argument?

probably making a fool of myself here, but what is the purpose of
that single argument to the macro "ZERO_PAGE"?

$ grep -r "define ZERO_PAGE" include
include/asm-frv/pgtable.h:#define ZERO_PAGE(vaddr) ({ BUG(); NULL; })
include/asm-frv/pgtable.h:#define ZERO_PAGE(vaddr) virt_to_page(empty_zero_page)
include/asm-v850/pgtable.h:#define ZERO_PAGE(vaddr) ((void *)0x87654321)
include/asm-mips/pgtable.h:#define ZERO_PAGE(vaddr) \
include/asm-blackfin/pgtable.h:#define ZERO_PAGE(vaddr) (virt_to_page(0))
include/asm-parisc/pgtable.h:#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
include/asm-alpha/pgtable.h:#define ZERO_PAGE(vaddr) (virt_to_page(ZERO_PGE))
AFAICT, there are no definitions of that macro that actually use
that argument. is that some kind of historical cruft?

Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry
Waterloo, Ontario, CANADA
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