On 04/04/2019 11:37 PM, Alexei Starovoitov wrote: > clang started to error on invalid asm clobber usage in x86 headers > and many bpf program samples failed to build with the message: > > CLANG-bpf /data/users/ast/bpf-next/samples/bpf/xdp_redirect_kern.o > In file included from /data/users/ast/bpf-next/samples/bpf/xdp_redirect_kern.c:14: > In file included from ../include/linux/in.h:23: > In file included from ../include/uapi/linux/in.h:24: > In file included from ../include/linux/socket.h:8: > In file included from ../include/linux/uio.h:14: > In file included from ../include/crypto/hash.h:16: > In file included from ../include/linux/crypto.h:26: > In file included from ../include/linux/uaccess.h:5: > In file included from ../include/linux/sched.h:15: > In file included from ../include/linux/sem.h:5: > In file included from ../include/uapi/linux/sem.h:5: > In file included from ../include/linux/ipc.h:9: > In file included from ../include/linux/refcount.h:72: > ../arch/x86/include/asm/refcount.h:72:36: error: asm-specifier for input or output variable conflicts with asm clobber list > r->refs.counter, e, "er", i, "cx"); > ^ > ../arch/x86/include/asm/refcount.h:86:27: error: asm-specifier for input or output variable conflicts with asm clobber list > r->refs.counter, e, "cx"); > ^ > 2 errors generated. > > Override volatile() to workaround the problem. > > Signed-off-by: Alexei Starovoitov <ast@xxxxxxxxxx> Applied, thanks!
