On Fri, Feb 04, 2022 at 05:26:27AM +0300, Vitaly Chikunov wrote: > Clang 12.0.1 cannot understand that value 64 is excluded from the shift > at compile time (for use in global context) resulting in build error[1]: > > 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)) > ^ ~~~ > > Avoid using DMA_BIT_MASK macro for that corner case. > > Cc: Tianyu Lan <Tianyu.Lan@xxxxxxxxxxxxx> > Cc: Michael Kelley <mikelley@xxxxxxxxxxxxx> > Cc: Long Li <longli@xxxxxxxxxxxxx> > Cc: Wei Liu <wei.liu@xxxxxxxxxx> > Link: https://lore.kernel.org/linux-hyperv/20220203235828.hcsj6najsl7yxmxa@xxxxxxxxxxxx/ BTW there is no need to put in a Link tag here. The tool I use (b4) handles this automatically. Wei.
