On Thu, 3 Feb 2022 15:53:51 -0800 Jakub Kicinski wrote:

On Mon, 13 Dec 2021 02:14:05 -0500 Tianyu Lan wrote:

quoted

@@ -2078,6 +2079,7 @@ struct hv_device *vmbus_device_create(const guid_t *type,
 	return child_device_obj;
 }
 
+static u64 vmbus_dma_mask = DMA_BIT_MASK(64);  

This breaks the x86 clang allmodconfig build as I presume those
involved know by now:

../drivers/hv/vmbus_drv.c:2082:29: error: shift count >= width of type [-Werror,-Wshift-count-overflow]
static u64 vmbus_dma_mask = DMA_BIT_MASK(64);
                            ^~~~~~~~~~~~~~~~
../include/linux/dma-mapping.h:76:54: note: expanded from macro 'DMA_BIT_MASK'
#define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
                                                     ^ ~~~
1 error generated.

Looks like a compiler issue actually, found the discussion now:

https://lore.kernel.org/llvm/202112181827.o3X7GmHz-lkp@intel.com/ (local)