Messages in this thread | | | Date | Mon, 9 Jul 2018 21:41:57 -0600 | From | Jason Gunthorpe <> | Subject | Re: linux-next: build warnings after merge of the rdma tree |
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On Tue, Jul 10, 2018 at 11:33:42AM +1000, Stephen Rothwell wrote: > Hi all, > > After merging the rdma tree, today's linux-next build (x86_64 > allmodconfig) produced these warnings: > > In file included from include/linux/printk.h:336:0, > from include/linux/kernel.h:14, > from arch/x86/include/asm/percpu.h:45, > from arch/x86/include/asm/current.h:6, > from include/linux/mutex.h:14, > from drivers/infiniband/hw/cxgb4/iw_cxgb4.h:34, > from drivers/infiniband/hw/cxgb4/cq.c:33: > drivers/infiniband/hw/cxgb4/cq.c: In function '__c4iw_poll_cq_one': > include/linux/dynamic_debug.h:127:3: warning: 'cqe.u.gen.wrid_hi' may be used uninitialized in this function [-Wmaybe-uninitialized] > __dynamic_pr_debug(&descriptor, pr_fmt(fmt), \ > ^~~~~~~~~~~~~~~~~~ > drivers/infiniband/hw/cxgb4/cq.c:674:16: note: 'cqe.u.gen.wrid_hi' was declared here > struct t4_cqe cqe; > ^~~ > In file included from include/linux/printk.h:336:0, > from include/linux/kernel.h:14, > from arch/x86/include/asm/percpu.h:45, > from arch/x86/include/asm/current.h:6, > from include/linux/mutex.h:14, > from drivers/infiniband/hw/cxgb4/iw_cxgb4.h:34, > from drivers/infiniband/hw/cxgb4/cq.c:33: > include/linux/dynamic_debug.h:127:3: warning: 'cqe.u.gen.wrid_low' may be used uninitialized in this function [-Wmaybe-uninitialized] > __dynamic_pr_debug(&descriptor, pr_fmt(fmt), \ > ^~~~~~~~~~~~~~~~~~ > drivers/infiniband/hw/cxgb4/cq.c:674:16: note: 'cqe.u.gen.wrid_low' was declared here > struct t4_cqe cqe; > ^~~ > In file included from include/linux/printk.h:336:0, > from include/linux/kernel.h:14, > from arch/x86/include/asm/percpu.h:45, > from arch/x86/include/asm/current.h:6, > from include/linux/mutex.h:14, > from drivers/infiniband/hw/cxgb4/iw_cxgb4.h:34, > from drivers/infiniband/hw/cxgb4/cq.c:33: > include/linux/dynamic_debug.h:127:3: warning: 'cqe.len' may be used uninitialized in this function [-Wmaybe-uninitialized] > __dynamic_pr_debug(&descriptor, pr_fmt(fmt), \ > ^~~~~~~~~~~~~~~~~~ > drivers/infiniband/hw/cxgb4/cq.c:674:16: note: 'cqe.len' was declared here > struct t4_cqe cqe; > ^~~ > > Introduced by commit > > 4ab39e2f98f2 ("RDMA/cxgb4: Make c4iw_poll_cq_one() easier to analyze") > > Again, I can't easily tell if these are false positives or not.
What compiler is producing these? I got nothing from 0-day build service or my local gcc-7..
They are false positives and I guess we need to put the uninitialized_var back that was hiding them.
Also curious that the powerpc compiler gets a different set..
Thanks, Jason
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