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ef9285f69f
With the PTE-tables now only being 256 bytes, allocating a full page for them is a giant waste. Start by improving the boot time allocator such that init_mm initialization will at least have optimal memory density. Much thanks to Will Deacon in help with debugging and ferreting out lost information on these dusty MMUs. Notes: - _TABLE_MASK is reduced to account for the shorter (256 byte) alignment of pte-tables, per the manual, table entries should only ever have state in the low 4 bits (Used,WrProt,Desc1,Desc0) so it is still longer than strictly required. (Thanks Will!!!) - Also use kernel_page_table() for the 020/030 zero_pgtable case and consequently remove the zero_pgtable init hack (will fix up later). 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/20200131125403.768263973@infradead.org Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> |
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