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xen-devel
Re: [Xen-devel] [PATCH] linux/x86: Initialize high_memory as early as po
On 29 Jun 2006, at 15:03, Jan Beulich wrote:
This didn't seem safe enough to me, and apparently also not to the
original
author (at least I attribute the FIXME comment to this) - after all not
everything before FIXADDR_START is high memory.
One could say that under DEBUG_HIGHMEM the check should be more strict
(so that the subsequent BUG() condition fires in more broken cases),
but
without DEBUG_HIGHMEM it might be left as-is to avoid zapping incorrect
page table entries.
Any kmap_atomic virtual address should be above FIXADDR_START. You have
a point about debugging though (e.g., passing a non-atomic kmap address
to kunmap_atomic).
-- Keir
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