In file included from ../linux/dev/drivers/block/floppy.c:172:
./linux/src/include/asm/floppy.h:90:19: error: invalid use of a cast in a inline asm context requiring an l-value: remove the cast or build with -fheinous-gnu-extensions
                 : "=a" ((char) st), 
                         ~~~~~~~^~
./linux/src/include/asm/floppy.h:91:19: error: invalid use of a cast in a inline asm context requiring an l-value: remove the cast or build with -fheinous-gnu-extensions
                   "=c" ((long) virtual_dma_count), 
                         ~~~~~~~^~~~~~~~~~~~~~~~~
./linux/src/include/asm/floppy.h:92:19: error: invalid use of a cast in a inline asm context requiring an l-value: remove the cast or build with -fheinous-gnu-extensions
                   "=S" ((long) virtual_dma_addr)
                         ~~~~~~~^~~~~~~~~~~~~~~~
3 errors generated.