Fix compiling warnings on fedora40 #1515
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This patch addresses a compiler warning indicating that the 'prev' variable may be used uninitialized in the function dr_vports_table_del_wire. Although this warning is a false positive, it is important to resolve it to prevent potential confusion and maintain code quality. The 'while (vport)' loop is intended to start from the second element of the linked list, as the first element is already checked by a preceding condition. By initializing 'prev' to the first element and 'vport' to 'prev->next', we ensure that the loop logic remains correct and the warning is eliminated. This change does not alter the functionality of the code but enhances its clarity and robustness by ensuring all variables are properly initialized before use. Signed-off-by: Li Zhijian <lizhijian@fujitsu.com>
This commit fixes a compiler warning related to the use of calloc.
```
libibnetdisc/ibnetdisc_cache.c:560:36: warning: ‘calloc’ sizes specified with ‘sizeof’ in the earlier argument and not in the later argument [-Wcalloc-transposed-args]
560 | calloc(sizeof(*node->ports), node->numports + 1))) {
| ^
libibnetdisc/ibnetdisc_cache.c:560:36: note: earlier argument should specify number of elements, later size of each element
```
The warning was due to transposed arguments in the calloc call, where the
number of elements and the size of each element were specified in the wrong
order.
The correct order for calloc's arguments is:
void *calloc(size_t nmemb, size_t size)
Signed-off-by: Li Zhijian <lizhijian@fujitsu.com>
This commit fixes a compiler warning related to the use of calloc.
```
librdmacm/examples/cmtime.c:993:31: warning: ‘calloc’ sizes specified with ‘sizeof’ in the earlier argument and not in the later argument [-Wcalloc-transposed-args]
993 | nodes = calloc(sizeof *nodes, iter);
| ^
librdmacm/examples/cmtime.c:993:31: note: earlier argument should specify number of elements, later size of each element
```
The warning was due to transposed arguments in the calloc call,
where the number of elements and the size of each element were
specified in the wrong order.
The correct order for calloc's arguments is:
void *calloc(size_t nmemb, size_t size)
Signed-off-by: Li Zhijian <lizhijian@fujitsu.com>
This commit fixes a compiler warning related to the use of calloc.
```
rdma-core/build/pyverbs/providers/mlx5/mlx5dv.c: In function ‘__pyx_pf_7pyverbs_9providers_4mlx5_6mlx5dv_10WqeCtrlSeg___init__’:
rdma-core/build/pyverbs/providers/mlx5/mlx5dv.c:48608:53: warning: ‘calloc’ sizes specified with ‘sizeof’ in the earlier argument and not in the later argument [-Wcalloc-transposed-args]
48608 | __pyx_v_self->__pyx_base.segment = calloc((sizeof(struct mlx5_wqe_ctrl_seg)), 1);
| ^~~~~~
rdma-core/build/pyverbs/providers/mlx5/mlx5dv.c:48608:53: note: earlier argument should specify number of elements, later size of each element
rdma-core/build/pyverbs/providers/mlx5/mlx5dv.c: In function ‘__pyx_pf_7pyverbs_9providers_4mlx5_6mlx5dv_10WqeDataSeg___init__’:
rdma-core/build/pyverbs/providers/mlx5/mlx5dv.c:50301:53: warning: ‘calloc’ sizes specified with ‘sizeof’ in the earlier argument and not in the later argument [-Wcalloc-transposed-args]
50301 | __pyx_v_self->__pyx_base.segment = calloc((sizeof(struct mlx5_wqe_data_seg)), 1);
| ^~~~~~
rdma-core/build/pyverbs/providers/mlx5/mlx5dv.c:50301:53: note: earlier argument should specify number of elements, later size of each element
```
The warning was due to transposed arguments in the calloc call,
where the number of elements and the size of each element were
specified in the wrong order.
The correct order for calloc's arguments is:
void *calloc(size_t nmemb, size_t size)
Signed-off-by: Li Zhijian <lizhijian@fujitsu.com>
zhijianli88
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zhijianli88
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It's believed that there is something wrong/BUG in ccache
- let's open the compiling command with
make VERBOSE=1
cd /home/lizhijian/rdma-core/build/librdmacm && cc -DVERBS_DEBUG -Drspreload_EXPORTS -I/home/lizhijian/rdma-core/build/include -I/usr/include/libnl3 -I/usr/include/drm -Wall -Wextra -Wno-sign-compare -Wno-unused-parameter -Wmissing-prototypes -Wmissing-declarations -Wwrite-strings -Wformat=2 -Wcast-function-type -Wformat-nonliteral -Wdate-time -Wnested-externs -Wshadow -Wstrict-prototypes -Wold-style-definition -Wredundant-decls -O2 -g -DNDEBUG -std=gnu11 -fPIC -MD -MT librdmacm/CMakeFiles/rspreload.dir/preload.c.o -MF CMakeFiles/rspreload.dir/preload.c.o.d -o CMakeFiles/rspreload.dir/preload.c.o -c /home/lizhijian/rdma-core/librdmacm/preload.c
/home/lizhijian/rdma-core/librdmacm/preload.c:1175:5: warning: no previous prototype for ‘__fxstat’ [-Wmissing-prototypes]
1175 | int __fxstat(int ver, int socket, struct stat *buf)
| ^~~~~~~~
- check what is the default
cc
# whereis cc
cc: /usr/bin/cc /usr/lib64/ccache/cc
# which cc
/usr/lib64/ccache/cc
We can see, it's a built-in command of the ccache.
- change the cc to GCC version, it works well
cd /home/lizhijian/rdma-core/build/librdmacm && /usr/bin/cc -DVERBS_DEBUG -Drspreload_EXPORTS -I/home/lizhijian/rdma-core/build/include -I/usr/include/libnl3 -I/usr/include/drm -Wall -Wextra -Wno-sign-compare -Wno-unused-parameter -Wmissing-prototypes -Wmissing-declarations -Wwrite-strings -Wformat=2 -Wcast-function-type -Wformat-nonliteral -Wdate-time -Wnested-externs -Wshadow -Wstrict-prototypes -Wold-style-definition -Wredundant-decls -O2 -g -DNDEBUG -std=gnu11 -fPIC -MD -MT librdmacm/CMakeFiles/rspreload.dir/preload.c.o -MF CMakeFiles/rspreload.dir/preload.c.o.d -o CMakeFiles/rspreload.dir/preload.c.o -c /home/lizhijian/rdma-core/librdmacm/preload.c
<no warning>
- pre-complie the C to extend all the includes and macros, and then build it with
ccache cc, it also works
# pre-complie
build/librdmacm# /usr/lib64/ccache/cc -DVERBS_DEBUG -Drspreload_EXPORTS -I/home/lizhijian/rdma-core/build/include -I/usr/include/libnl3 -I/usr/include/drm -Wall -Wextra -Wno-sign-compare -Wno-unused-parameter -Wmissing-prototypes -Wmissing-declarations -Wwrite-strings -Wformat=2 -Wcast-function-type -Wformat-nonliteral -Wdate-time -Wnested-externs -Wshadow -Wstrict-prototypes -Wold-style-definition -Wredundant-decls -O2 -g -DNDEBUG -std=gnu11 -fPIC -MD -MT librdmacm/CMakeFiles/rspreload.dir/preload.c.o -MF CMakeFiles/rspreload.dir/preload.c.o.d -c /home/lizhijian/rdma-core/librdmacm/preload.c -E -o preload.i
# compile to object file
build/librdmacm# /usr/lib64/ccache/cc -DVERBS_DEBUG -Drspreload_EXPORTS -I/home/lizhijian/rdma-core/build/include -I/usr/include/libnl3 -I/usr/include/drm -Wall -Wextra -Wno-sign-compare -Wno-unused-parameter -Wmissing-prototypes -Wmissing-declarations -Wwrite-strings -Wformat=2 -Wcast-function-type -Wformat-nonliteral -Wdate-time -Wnested-externs -Wshadow -Wstrict-prototypes -Wold-style-definition -Wredundant-decls -O2 -g -DNDEBUG -std=gnu11 -fPIC -MD -MT librdmacm/CMakeFiles/rspreload.dir/preload.c.o -MF CMakeFiles/rspreload.dir/preload.c.o.d -c preload.i -o preload.i.o
So, it's believed that there is something wrong in the ccache cc
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Droped the fixing __fxstat patch because it's not rdma-core's problem. |
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Recently, I updated my host to fedora40 and rebuilt the rdma-core. The compiler complained a few warnings.
gcc: gcc (GCC) 14.2.1 20240912 (Red Hat 14.2.1-3)
Thi PR intends to fix them.