Messages in this thread | | | Date | Mon, 23 Apr 2007 11:06:48 -0700 | From | Jeremy Fitzhardinge <> | Subject | Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings |
| |
Eric W. Biederman wrote: > Consider a memory hole of size 8M immediately after our bootmem bitmap. > head.S which knows nothing of holes will map the pages of the hole > into the initial page tables assuming that is where the page tables > will live. >
Sure, but considering we're only talking about mapping an additional *2* pages, the chances are that it will affect a kernel as much as the early head.S mapping. It's well within the variability of fairly similar kernel configs.
> As for how to fix this, we need to call boot_ioremap or better > bt_ioremap on the address returned from alloc_bootmem_pages_low to > force the allocated page into the page table. After we have setup > the page table page we can call unmap the page to free up the scarce > early mapping resource. >
Would that be necessary? Is there any need to remap it? Couldn't you just do the straightforward phys->virt mapping and use the page where it lies?
J - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |