Messages in this thread | | | Date | Tue, 28 Oct 2014 10:24:08 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH] mm: Avoid overlap the fixmap area on i386 |
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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.
-hpa
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