Messages in this thread | | | Date | Thu, 07 Jun 2007 21:29:28 +1000 | From | Nick Piggin <> | Subject | Re: why does the macro "ZERO_PAGE" take an argument? |
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Robert P. J. Day wrote: > 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?
MIPS?
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