b0fbdf759d
This patch modifies selftests/bpf/Makefile to pass -Wno-attributes to GCC. This is because of the following attributes which are ignored: - btf_decl_tag - btf_type_tag There are many of these. At the moment none of these are recognized/handled by gcc-bpf. We are aware that btf_decl_tag is necessary for some of the selftest harness to communicate test failure/success. Support for it is in progress in GCC upstream: https://gcc.gnu.org/pipermail/gcc-patches/2024-May/650482.html However, the GCC master branch is not yet open, so the series above (currently under review upstream) wont be able to make it there until 14.1 gets released, probably mid next week. As for btf_type_tag, more extensive work will be needed in GCC upstream to support it in both BTF and DWARF. We have a WIP big patch for that, but that is not needed to compile/build the selftests. - used There are SEC macros defined in the selftests as: #define SEC(N) __attribute__((section(N),used)) The SEC macro is used for both functions and global variables. According to the GCC documentation `used' attribute is really only meaningful for functions, and it warns when the attribute is used for other global objects, like for example ctl_array in test_xdp_noinline.c. Ignoring this is benign. - align_value In progs/test_cls_redirect.c:127 there is: typedef uint8_t *net_ptr __attribute__((align_value(8))); GCC warns that it is ignoring this attribute, because it is not implemented by GCC. I think ignoring this attribute in GCC is benign, because according to the clang documentation [1] its purpose seems to be merely declarative and doesn't seem to translate into extra checks at run-time, only to perhaps better optimized code ("runtime behavior is undefined if the pointed memory object is not aligned to the specified alignment"). [1] https://clang.llvm.org/docs/AttributeReference.html#align-value Tested in bpf-next master. Signed-off-by: Jose E. Marchesi <jose.marchesi@oracle.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: Yonghong Song <yonghong.song@linux.dev> Link: https://lore.kernel.org/bpf/20240507074227.4523-3-jose.marchesi@oracle.com |
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| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| 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.