Messages in this thread | | | Date | Sun, 25 Mar 2001 17:33:44 +0100 | From | Russell King <> | Subject | Re: [patch] pae-2.4.3-A4 |
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On Sun, Mar 25, 2001 at 04:53:37PM +0200, Ingo Molnar wrote: > one nontrivial issue was that on PAE the pgd has to be installed with > 'present' pgd entries, due to a CPU erratum. This means that the > pgd_present() code in mm/memory.c, while correct theoretically, doesnt > work with PAE. An equivalent solution is to use !pgd_none(), which also > works with the PAE workaround.
Certainly that's the way the original *_alloc routines used to work. In fact, ARM never had need to implement the pmd_present() macros, since they were never referenced - only the pmd_none() macros were.
However, I'm currently struggling with this change on ARM - so far after a number of hours trying to kick something into shape, I've not managed to even get to the stange where I get a kernel image to link, let alone the compilation to finish.
One of my many dilemas at the moment is how to allocate the page 0 PMD in pgd_alloc(), where we don't have a mm_struct to do the locking against.
-- Russell King (rmk@arm.linux.org.uk) The developer of ARM Linux http://www.arm.linux.org.uk/personal/aboutme.html
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