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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/kernel/dma-swiotlb.c | |
| parent | f3e5a8579c70d591db8e772cab93af0ec7e39849 (diff) | |
| download | linux-25078dc1f74be16b858e914f52cc8f4d03c2271a.tar.gz linux-25078dc1f74be16b858e914f52cc8f4d03c2271a.tar.bz2 linux-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/kernel/dma-swiotlb.c')
| -rw-r--r-- | arch/powerpc/kernel/dma-swiotlb.c | 6 |
1 files changed, 1 insertions, 5 deletions
diff --git a/arch/powerpc/kernel/dma-swiotlb.c b/arch/powerpc/kernel/dma-swiotlb.c index 5fc335f4d9cd..678811abccfc 100644 --- a/arch/powerpc/kernel/dma-swiotlb.c +++ b/arch/powerpc/kernel/dma-swiotlb.c @@ -108,12 +108,8 @@ int __init swiotlb_setup_bus_notifier(void) void __init swiotlb_detect_4g(void) { - if ((memblock_end_of_DRAM() - 1) > 0xffffffff) { + if ((memblock_end_of_DRAM() - 1) > 0xffffffff) ppc_swiotlb_enable = 1; -#ifdef CONFIG_ZONE_DMA32 - limit_zone_pfn(ZONE_DMA32, (1ULL << 32) >> PAGE_SHIFT); -#endif - } } static int __init check_swiotlb_enabled(void) |