Messages in this thread | | | Date | Tue, 28 Oct 2014 18:29:07 +0100 (CET) | From | Thomas Gleixner <> | Subject | Re: [PATCH] mm: Avoid overlap the fixmap area on i386 |
| |
On Tue, 28 Oct 2014, H. Peter Anvin wrote: > On 10/28/2014 04:06 AM, Thomas Gleixner wrote: > >> > >> The available address we can use is lower than FIXADDR_BOOT_START. So > >> We will set the kmap boundary below the FIXADDR_BOOT_START, if configure > >> the high memory. > >> > >> If we configure the high memory, the vmalloc reserve area should end > >> up to PKMAP_BASE, otherwise should end up to FIXADDR_BOOT_START. > > > > Which is not really a problem, because the FIXADDR_BOOT area is only > > used during boot for early_ioremap() and it's unused when ioremap() is > > functional. vmalloc becomes available after early boot so the > > FIXADDR_BOOT area is available for reuse. > > > > Given the very limited address space available on i386, it would be > extremely undesirable to not reuse address space when possible.
Fair enough. Then we should do that for the highmem=y case as well.
Thanks,
tglx
| |