Jeremy Fitzhardinge wrote: > head.S creates the very initial pagetable for the kernel. This just > maps enough space for the kernel itself, and an allocation bitmap. > The amount of mapped memory is rounded up to 4Mbytes, and so this > typically ends up mapping 8Mbytes of memory. > > When booting, pagetable_init() needs to create mappings for all > lowmem, and the pagetables for these mappings are allocated from the > free pages around the kernel in low memory. If the number of > pagetable pages + kernel size exceeds head.S's initial mapping, it > will end up faulting on an unmapped page. This will only happen with > specific combinations of kernel size and memory size. > > This patch makes sure that head.S also maps enough space to fit the > kernel pagetables as well as the kernel itself. It ends up using an > additional two pages of unreclaimable memory. > > Signed-off-by: Jeremy Fitzhardinge <[EMAIL PROTECTED]> > Acked-by: "H. Peter Anvin" <[EMAIL PROTECTED]> > Cc: Andi Kleen <[EMAIL PROTECTED]> > Cc: Zachary Amsden <[EMAIL PROTECTED]> > Cc: Chris Wright <[EMAIL PROTECTED]> > Cc: "Eric W. Biederman" <[EMAIL PROTECTED]> > Cc: Linus Torvalds <[EMAIL PROTECTED]>,
Is some version of this going in for 2.6.21, or is it not a real problem? - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
