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SubjectRe: Linux 2.2.19pre2
On Sat, Dec 16, 2000 at 07:11:47PM +0000, Alan Cox wrote:
> o E820 memory detect backport from 2.4 (Michael Chen)
It's broken, it will crash machines:

for (i = 0; i < e820.nr_map; i++) {
unsigned long start, end;
/* RAM? */
if (e820.map[i].type != E820_RAM)
continue;
start = PFN_UP(e820.map[i].addr);
end = PFN_DOWN(e820.map[i].addr + e820.map[i].size);
if (start >= end)
continue;
if (end > max_pfn)
max_pfn = end;
}
memory_end = (max_pfn << PAGE_SHIFT);
this will threat non-RAM holes as RAM. On 2.4.x we do a different things, that
is we collect the max_pfn but then we don't assume that there are no holes
between 1M and max_pfn ;), we instead fill the bootmem allocator _only_ with
E820_RAM segments.

I was in the process of fixing this (I also just backported the thinkpad
%edx clobber fix), but if somebody is going to work on this please let
me know so we stay in sync.

> o wake_one semantics for accept() (Andrew Morton)

I dislike the implementation. I stick with my faster and nicer implementation
that was just included in aa kernels for some time (2.2.18aa2 included it for
example). Andrew, I guess you didn't noticed I just implemented the wakeone for
accept. (I just ported it on top of 2.2.19pre2 after backing out the wakeone in
pre2)

Andrea
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