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![]() -Wflex-array-member-not-at-end is coming in GCC-14, and we are getting ready to enable it globally. There are currently a couple of objects in `struct smc_clc_msg_proposal_area` that contain a couple of flexible structures: struct smc_clc_msg_proposal_area { ... struct smc_clc_v2_extension pclc_v2_ext; ... struct smc_clc_smcd_v2_extension pclc_smcd_v2_ext; ... }; So, in order to avoid ending up with a couple of flexible-array members in the middle of a struct, we use the `struct_group_tagged()` helper to separate the flexible array from the rest of the members in the flexible structure: struct smc_clc_smcd_v2_extension { struct_group_tagged(smc_clc_smcd_v2_extension_fixed, fixed, u8 system_eid[SMC_MAX_EID_LEN]; u8 reserved[16]; ); struct smc_clc_smcd_gid_chid gidchid[]; }; With the change described above, we now declare objects of the type of the tagged struct without embedding flexible arrays in the middle of another struct: struct smc_clc_msg_proposal_area { ... struct smc_clc_v2_extension_fixed pclc_v2_ext; ... struct smc_clc_smcd_v2_extension_fixed pclc_smcd_v2_ext; ... }; We also use `container_of()` when we need to retrieve a pointer to the flexible structures. So, with these changes, fix the following warnings: In file included from net/smc/af_smc.c:42: net/smc/smc_clc.h:186:49: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end] 186 | struct smc_clc_v2_extension pclc_v2_ext; | ^~~~~~~~~~~ net/smc/smc_clc.h:188:49: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end] 188 | struct smc_clc_smcd_v2_extension pclc_smcd_v2_ext; | ^~~~~~~~~~~~~~~~ Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org> Reviewed-by: Wen Gu <guwen@linux.alibaba.com> Signed-off-by: David S. Miller <davem@davemloft.net> |
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README |
Linux kernel ============ There are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. Please read Documentation/admin-guide/README.rst first. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. The formatted documentation can also be read online at: https://www.kernel.org/doc/html/latest/ There are various text files in the Documentation/ subdirectory, several of them using the reStructuredText markup notation. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.