m68k: mm: Extend table allocator for multiple sizes

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In addition to the PGD/PMD table size (128*4) add a PTE table size
(64*4) to the table allocator. This completely removes the pte-table
overhead compared to the old code, even for dense tables.

Notes:

 - the allocator gained a list_empty() check to deal with there not
   being any pages at all.

 - the free mask is extended to cover more than the 8 bits required
   for the (512 byte) PGD/PMD tables.

 - NR_PAGETABLE accounting is restored.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Will Deacon <will@kernel.org>
Acked-by: Greg Ungerer <gerg@linux-m68k.org>
Tested-by: Michael Schmitz <schmitzmic@gmail.com>
Tested-by: Greg Ungerer <gerg@linux-m68k.org>
Link: https://lore.kernel.org/r/20200131125403.882175409@infradead.org
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

...

This commit is contained in:

Peter Zijlstra 2020-01-31 13:45:39 +01:00 • committed by Geert Uytterhoeven

parent 61c64a25ae

commit 0e071ee681

3 changed files with 70 additions and 42 deletions

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31

arch/m68k/include/asm/motorola_pgalloc.h

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16

arch/m68k/mm/init.c

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65

arch/m68k/mm/motorola.c

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