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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