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    SubjectRe: [RFC 1/1] mm: add virt to phys debug
    Christoph Lameter napsal(a):
    > On Thu, 1 May 2008, Jiri Slaby wrote:
    >> Add some (configurable) expensive sanity checking to catch wrong address
    >> translations on x86.
    >> - create linux/mmdebug.h file to be able include this file in
    >> asm headers to not get unsolvable loops in header files
    >> - __phys_addr on x86_32 became a function in ioremap.c since
    >> PAGE_OFFSET and is_vmalloc_addr is undefined if declared in
    >> page_32.h (again circular dependencies)
    >> - add __phys_addr_const for initializing doublefault_tss.__cr3
    > Hmmm.. We could use include/linux/bounds.h to make
    > VMALLOC_START/VMALLOC_END (or whatever you need for checking the memory
    > boundaries) a cpp constant which may allow the use in page_32.h without
    > circular dependencies.

    Hrm, not that easy. I ended up in splitting fixmap_32.h (VMALLOC constants
    depends on it on 32-bit), moving around constants from over all the tree
    (NR_CPUS, FIX_ACPI_PAGES...) to not include files which would create loops,
    but still not having e.g. PMD_MASK available on all configurations. I think
    it's not worth it. Objections to merging the patch as was


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      Last update: 2008-05-13 16:43    [W:0.026 / U:4.608 seconds]
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