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powerpc: use mm zones more sensibly

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Powerpc has somewhat odd usage where ZONE_DMA is used for all memory on
common 64-bit configfs, and ZONE_DMA32 is used for 31-bit schemes.

Move to a scheme closer to what other architectures use (and I dare to
say the intent of the system):

 - ZONE_DMA: optionally for memory < 31-bit (64-bit embedded only)
 - ZONE_NORMAL: everything addressable by the kernel
 - ZONE_HIGHMEM: memory > 32-bit for 32-bit kernels

Also provide information on how ZONE_DMA is used by defining
ARCH_ZONE_DMA_BITS.

Contains various fixes from Benjamin Herrenschmidt.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christoph Hellwig 2018-12-16 17:53:49 +01:00 • committed by Michael Ellerman
parent f3e5a8579c
commit 25078dc1f7
9 changed files with 27 additions and 68 deletions
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2
include/linux/mmzone.h
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@ -314,7 +314,7 @@ enum zone_type {
* Architecture Limit
* ---------------------------
* parisc, ia64, sparc <4G
* s390 <2G
* s390, powerpc <2G
* arm Various
* alpha Unlimited or 0-16MB.
*