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
(http://lkml.org/lkml/2008/5/1/300)?
Thanks.
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