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| author |   Christoph Hellwig <hch@lst.de> | 2018-12-16 17:53:49 +0100 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2018-12-20 22:21:20 +1100 |
| commit | 25078dc1f74be16b858e914f52cc8f4d03c2271a (patch) | |
| tree | c022dcf7a28611f727ca834b2fac9952f02cb14d /arch/powerpc/include/asm/page.h | |
| parent | cxl: drop the dma_set_mask callback from vphb (diff) | |
| download | linux-dev-25078dc1f74be16b858e914f52cc8f4d03c2271a.tar.xz linux-dev-25078dc1f74be16b858e914f52cc8f4d03c2271a.zip | |
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 'arch/powerpc/include/asm/page.h')
| -rw-r--r-- | arch/powerpc/include/asm/page.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/page.h b/arch/powerpc/include/asm/page.h index a7624a3b1435..5c5ea2413413 100644 --- a/arch/powerpc/include/asm/page.h +++ b/arch/powerpc/include/asm/page.h @@ -340,4 +340,6 @@ struct vm_area_struct; #endif /* __ASSEMBLY__ */ #include <asm/slice.h> +#define ARCH_ZONE_DMA_BITS 31 + #endif /* _ASM_POWERPC_PAGE_H */ |