diff options
| author | Catalin Marinas <catalin.marinas@arm.com> | 2024-08-11 10:09:35 +0300 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2024-08-22 06:18:00 +0200 |
| commit | ba0fb44aed47693cc2482427f63ba6cd19051327 (patch) | |
| tree | 621c630705defd780fbeac9b9b103f3c80264c23 /arch/s390/mm | |
| parent | fa3c109a6d302b56437a6412c5f3044c3e12de03 (diff) | |
dma-mapping: replace zone_dma_bits by zone_dma_limit
The hardware DMA limit might not be power of 2. When RAM range starts
above 0, say 4GB, DMA limit of 30 bits should end at 5GB. A single high
bit can not encode this limit.
Use a plain address for the DMA zone limit instead.
Since the DMA zone can now potentially span beyond 4GB physical limit of
DMA32, make sure to use DMA zone for GFP_DMA32 allocations in that case.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Co-developed-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Petr Tesarik <ptesarik@suse.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'arch/s390/mm')
| -rw-r--r-- | arch/s390/mm/init.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c index e3d258f9e726..688abc65c79e 100644 --- a/arch/s390/mm/init.c +++ b/arch/s390/mm/init.c @@ -97,7 +97,7 @@ void __init paging_init(void) vmem_map_init(); sparse_init(); - zone_dma_bits = 31; + zone_dma_limit = DMA_BIT_MASK(31); memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); max_zone_pfns[ZONE_DMA] = virt_to_pfn(MAX_DMA_ADDRESS); max_zone_pfns[ZONE_NORMAL] = max_low_pfn; |