summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/kernel/dma-swiotlb.c
diff options
context:
space:
mode:
authorChristoph Hellwig <hch@lst.de>2018-12-16 17:53:49 +0100
committerMichael Ellerman <mpe@ellerman.id.au>2018-12-20 12:21:20 +0100
commit25078dc1f74be16b858e914f52cc8f4d03c2271a (patch)
treec022dcf7a28611f727ca834b2fac9952f02cb14d /arch/powerpc/kernel/dma-swiotlb.c
parentcxl: drop the dma_set_mask callback from vphb (diff)
downloadlinux-25078dc1f74be16b858e914f52cc8f4d03c2271a.tar.xz
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.c6
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)