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s390/dma: provide proper ARCH_ZONE_DMA_BITS value 

On s390 ZONE_DMA is up to 2G, i.e. ARCH_ZONE_DMA_BITS should be 31 bits.
The current value is 24 and makes __dma_direct_alloc_pages() take a
wrong turn first (but __dma_direct_alloc_pages() recovers then).

Let's correct ARCH_ZONE_DMA_BITS value and avoid wrong turns.

Signed-off-by: Halil Pasic <pasic@linux.ibm.com>
Reported-by: Petr Tesarik <ptesarik@suse.cz>
Fixes: c61e963734 ("dma-direct: add support for allocation from ZONE_DMA and ZONE_DMA32")
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
This commit is contained in:
Halil Pasic 2019-07-24 00:51:55 +02:00 committed by Heiko Carstens
parent 9779048d71
commit 1a2dcff881
1 changed files with 2 additions and 0 deletions
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2
arch/s390/include/asm/page.h
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@ -177,6 +177,8 @@ static inline int devmem_is_allowed(unsigned long pfn)
#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \
VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
#define ARCH_ZONE_DMA_BITS 31
#include <asm-generic/memory_model.h>
#include <asm-generic/getorder.h>