[dpdk-dev] [PATCH 2/2] vhost: fix build error caused by 64bit print formatting

David Marchand david.marchand at redhat.com
Mon Aug 19 10:40:29 CEST 2019


On Thu, Aug 15, 2019 at 6:16 PM David Christensen
<drc at linux.vnet.ibm.com> wrote:
>
> >> Use of %llx print formatting causes meson build error on Power systems with
> >> RHEL 7.6 and gcc 4.8.5.  Replace with PRIx64 macro.
> >>
> >> +                               (uint64_t)reg_struct.range.start,
> >> +                               (uint64_t)reg_struct.range.start +
> >> +                               (uint64_t)reg_struct.range.len - 1);
>
> I didn't need them when compiling on Power but it's the only way I could
> get x86 to build without any warning:
>
> cc -Ilib/lib@@rte_vhost at sta -Ilib -I../lib -Ilib/librte_vhost
> -I../lib/librte_vhost -I. -I../ -Iconfig -I../config
> -Ilib/librte_eal/common/include -I../lib/librte_eal/common/include
> -I../lib/librte_eal/linux/eal/include -Ilib/librte_eal/common
> -I../lib/librte_eal/common -Ilib/librte_eal/common/include/arch/x86
> -I../lib/librte_eal/common/include/arch/x86 -Ilib/librte_eal
> -I../lib/librte_eal -Ilib/librte_kvargs -I../lib/librte_kvargs
> -Ilib/librte_ethdev -I../lib/librte_ethdev -Ilib/librte_net
> -I../lib/librte_net -Ilib/librte_mbuf -I../lib/librte_mbuf
> -Ilib/librte_mempool -I../lib/librte_mempool -Ilib/librte_ring
> -I../lib/librte_ring -Ilib/librte_meter -I../lib/librte_meter
> -Ilib/librte_cryptodev -I../lib/librte_cryptodev -Ilib/librte_hash
> -I../lib/librte_hash -Ilib/librte_pci -I../lib/librte_pci -pipe
> -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -O3 -include rte_config.h
> -Wunused-parameter -Wsign-compare -Wcast-qual -D_GNU_SOURCE -fPIC
> -march=native -fno-strict-aliasing -DALLOW_EXPERIMENTAL_API  -MD -MQ
> 'lib/lib@@rte_vhost at sta/librte_vhost_vhost_user.c.o' -MF
> 'lib/lib@@rte_vhost at sta/librte_vhost_vhost_user.c.o.d' -o
> 'lib/lib@@rte_vhost at sta/librte_vhost_vhost_user.c.o' -c
> ../lib/librte_vhost/vhost_user.c
> ../lib/librte_vhost/vhost_user.c: In function ‘vhost_user_set_mem_table’:
> ../lib/librte_vhost/vhost_user.c:1088:4: warning: format ‘%lx’ expects
> argument of type ‘long unsigned int’, but argument 4 has type ‘__u64’
> [-Wformat=]
>      RTE_LOG(INFO, VHOST_CONFIG,
>      ^
> ../lib/librte_vhost/vhost_user.c:1088:4: warning: format ‘%lx’ expects
> argument of type ‘long unsigned int’, but argument 5 has type ‘__u64’
> [-Wformat=]
>
> This system was also RHEL 7.6 with gcc 4.8.5-36

Ok, I run the same.
The catch is that I did not have RTE_LIBRTE_VHOST_POSTCOPY enabled in
my working environment (using make) while meson enables it as long as
userfaultd.h is present.

Maxime, Tiwei,

Can't we use uintXX_t instead of (what looks to me) kernel types __uXX ?


-- 
David Marchand


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