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perf_snapshot_branch_stack is set up in an architecture-agnostic way, so there is no reason for BPF subsystem to keep track of which architectures do support LBR or not. E.g., it looks like ARM64 might soon get support for BRBE ([0]), which (with proper integration) should be possible to utilize using this BPF helper. perf_snapshot_branch_stack static call will point to __static_call_return0() by default, which just returns zero, which will lead to -ENOENT, as expected. So no need to guard anything here. [0] https://lore.kernel.org/linux-arm-kernel/20240125094119.2542332-1-anshuman.khandual@arm.com/ Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: Yonghong Song <yonghong.song@linux.dev> Link: https://lore.kernel.org/r/20240404002640.1774210-2-andrii@kernel.org Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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.