Hi!

On 11/1/20 6:04 PM, Mike Rapoport wrote:

It's been a while since DISCONTIGMEM is generally considered deprecated,
but it is still used by four architectures. This set replaces DISCONTIGMEM
with a different way to handle holes in the memory map and marks
DISCONTIGMEM configuration as BROKEN in Kconfigs of these architectures with
the intention to completely remove it in several releases.

While for 64-bit alpha and ia64 the switch to SPARSEMEM is quite obvious
and was a matter of moving some bits around, for smaller 32-bit arc and
m68k SPARSEMEM is not necessarily the best thing to do.

On 32-bit machines SPARSEMEM would require large sections to make section
index fit in the page flags, but larger sections mean that more memory is
wasted for unused memory map.

Besides, pfn_to_page() and page_to_pfn() become less efficient, at least on
arc.

So I've decided to generalize arm's approach for freeing of unused parts of
the memory map with FLATMEM and enable it for both arc and m68k. The
details are in the description of patches 10 (arc) and 13 (m68k).

Apologies for the late reply. Is this still relevant for testing?

I have already successfully tested v1 of the patch set, shall I test v2?

Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - glaubitz@debian.org
`. `'   Freie Universitaet Berlin - glaubitz@physik.fu-berlin.de
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913


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