On Wed, Sep 09, 2015 at 05:16:22PM +0800, Yuantian.Tang@xxxxxxxxxxxxx wrote: > From: Tang Yuantian <Yuantian.Tang@xxxxxxxxxxxxx> > > kbuild test robot reports the warnings: > drivers/ata/ahci_qoriq.c: In function 'ahci_qoriq_hardreset': > >> include/asm-generic/io.h:163:2: warning: 'px_is' may be used > >> uninitialized in this function [-Wuninitialized] > drivers/ata/ahci_qoriq.c:70:14: note: 'px_is' was declared here > >> include/asm-generic/io.h:163:2: warning: 'px_cmd' may be used > >> uninitialized in this function [-Wuninitialized] > drivers/ata/ahci_qoriq.c:70:6: note: 'px_cmd' was declared here > > This patch fixed it by assigning 0 to px_is and px_cmd variables. > This patch also remove line 'struct ccsr_ahci *reg_base' which is > not referred by any other codes and thus a dead one. Hmm... I think the problem here is that the complier can't know whether qoriq_priv->type would change across intervening function calls. Maybe a better solution is caching the type in a local variable so that the compiler can tell that those two tests will always move together? It generally isn't a good idea to clear variables unnecessarily as that can hide actual bugs that compiler can detect. Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
