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156c75f596
Song Liu says: ==================== Fix ftrace for livepatch + BPF fexit programs livepatch and BPF trampoline are two special users of ftrace. livepatch uses ftrace with IPMODIFY flag and BPF trampoline uses ftrace direct functions. When livepatch and BPF trampoline with fexit programs attach to the same kernel function, BPF trampoline needs to call into the patched version of the kernel function. 1/3 and 2/3 of this patchset fix two issues with livepatch + fexit cases, one in the register_ftrace_direct path, the other in the modify_ftrace_direct path. 3/3 adds selftests for both cases. Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org> --- v4: https://patch.msgid.link/20251027175023.1521602-1-song@kernel.org Changes v3 => v4: 1. Add helper reset_direct. (Steven) 2. Add Reviewed-by from Jiri. 3. Fix minor typo in comments. v3: https://lore.kernel.org/bpf/20251026205445.1639632-1-song@kernel.org/ Changes v2 => v3: 1. Incorporate feedback by AI, which also fixes build error reported by Steven and kernel test robot. v2: https://lore.kernel.org/bpf/20251024182901.3247573-1-song@kernel.org/ Changes v1 => v2: 1. Target bpf tree. (Alexei) 2. Bring back the FTRACE_WARN_ON in __ftrace_hash_update_ipmodify for valid code paths. (Steven) 3. Update selftests with cleaner way to find livepatch-sample.ko. (offlline discussion with Ihor) v1: https://lore.kernel.org/bpf/20251024071257.3956031-1-song@kernel.org/ ==================== Signed-off-by: Alexei Starovoitov <ast@kernel.org> |
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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.