Messages in this thread | | | From | "Stephen C. Tweedie" <> | Date | Thu, 10 Feb 2000 14:54:22 +0000 (GMT) | Subject | Re: how does kernel get the "current" task struct? |
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Hi,
On Wed, 9 Feb 2000 21:47:39 +0100, Jamie Lokier <lkd@tantalophile.demon.co.uk> said:
> Slightly different topic: I think I see a bug. This code in > free_pages_ok: > ... > map_nr here is relative to the first page in mem_map, whichever zone is > used. That means the first page in mem_map had better have as much > alignment as any zone, otherwise the masking operations on map_nr aren't > going to work nicely at all. This only affects the folks who are asking > about systems with memory that doesn't start at address zero.
It's not a bug --- it's an alignment constraint, just like the zone alignment one. If your physical memory doesn't start on an aligned boundary, then you just have some missing pages in the mem_map. The PG_RESERVED mem_map page flag can be (and is) used to indicate exactly that sort of unaccessible page.
--Stephen
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