On Wed, 11 Jun 2014 08:45:18 +0300 Dan Carpenter <dan.carpenter@xxxxxxxxxx> wrote: > On Tue, Jun 10, 2014 at 05:38:49PM -0400, Jeff Layton wrote: > > From: Jeff Layton <jlayton@xxxxxxxxxxxxxxx> > > > > Lately, when I do a make with C=1, I get *tons* of these warnings: > > > > include/linux/err.h:35:16: warning: dereference of noderef expression > > include/linux/err.h:30:23: warning: dereference of noderef expression > > Which version of Sparse, which version of the kernel and which .c file > can I compile to reproduce this? > > I built fs/cifs/ and I didn't see the sparse warning. > > regards, > dan carpenter > $ rpm -q sparse sparse-0.5.0-1.fc20.x86_64 I see it all over the tree, but an easy example is fs/locks.c: $ make fs/locks.o C=1 make[1]: Nothing to be done for `all'. make[1]: Nothing to be done for `relocs'. CHK include/config/kernel.release CHK include/generated/uapi/linux/version.h CHK include/generated/utsrelease.h CALL scripts/checksyscalls.sh CHECK fs/locks.c include/linux/err.h:35:16: warning: dereference of noderef expression include/linux/err.h:30:23: warning: dereference of noderef expression include/linux/err.h:35:16: warning: dereference of noderef expression include/linux/err.h:30:23: warning: dereference of noderef expression CC fs/locks.o It has two IS_ERR calls and two PTR_ERR calls, and each generates the warning. -- Jeff Layton <jlayton@xxxxxxxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-sparse" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
