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| author | Christoph Hellwig <hch@lst.de> | 2018-12-16 19:53:49 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-12-20 14:21:20 +0300 |
| commit | 25078dc1f74be16b858e914f52cc8f4d03c2271a (patch) | |
| tree | c022dcf7a28611f727ca834b2fac9952f02cb14d /Documentation/kernel-hacking | |
| parent | f3e5a8579c70d591db8e772cab93af0ec7e39849 (diff) | |
| download | linux-25078dc1f74be16b858e914f52cc8f4d03c2271a.tar.xz | |
powerpc: use mm zones more sensibly
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>
Diffstat (limited to 'Documentation/kernel-hacking')
0 files changed, 0 insertions, 0 deletions