[ Upstream commit 1a2dcff881059dedc14fafc8a442664c8dbd60f1 ]
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: c61e9637340e ("dma-direct: add support for allocation from ZONE_DMA and ZONE_DMA32") Signed-off-by: Heiko Carstens heiko.carstens@de.ibm.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/s390/include/asm/page.h | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/s390/include/asm/page.h b/arch/s390/include/asm/page.h index 41e3908b397f8..0d753291c43c0 100644 --- a/arch/s390/include/asm/page.h +++ b/arch/s390/include/asm/page.h @@ -176,6 +176,8 @@ 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>