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675b4e24bc
The vmlinux.h file generated by bpftool makes use of compiler pragmas in order to install the CO-RE preserve_access_index in all the struct types derived from the BTF info: #ifndef __VMLINUX_H__ #define __VMLINUX_H__ #ifndef BPF_NO_PRESERVE_ACCESS_INDEX #pragma clang attribute push (__attribute__((preserve_access_index)), apply_t = record #endif [... type definitions generated from kernel BTF ... ] #ifndef BPF_NO_PRESERVE_ACCESS_INDEX #pragma clang attribute pop #endif The `clang attribute push/pop' pragmas are specific to clang/llvm and are not supported by GCC. At the moment the BTF dumping services in libbpf do not support dicriminating between types dumped because they are directly referred and types dumped because they are dependencies. A suitable API is being worked now. See [1] and [2]. In the interim, this patch changes the selftests/bpf Makefile so it passes -DBPF_NO_PRESERVE_ACCESS_INDEX to GCC when it builds the selftests. This workaround is temporary, and may have an impact on the results of the GCC-built tests. [1] https://lore.kernel.org/bpf/20240503111836.25275-1-jose.marchesi@oracle.com/T/#u [2] https://lore.kernel.org/bpf/20240504205510.24785-1-jose.marchesi@oracle.com/T/#u Tested in bpf-next master. No regressions. Signed-off-by: Jose E. Marchesi <jose.marchesi@oracle.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20240507095011.15867-1-jose.marchesi@oracle.com |
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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.