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11f5710d96
The BPF sample filtering requires two kernel changes below:
* bpf_cast_to_kernel_ctx() kfunc (added in v6.2)
* setting perf_sample_data->sample_flags (finished in v6.3)
The perf tools can check bpf_cast_to_kernel_ctx() easily so it can
refuse BPF filters on those old kernels (v6.1 and earlier).
But checking sample_flags appears to be difficult so current code won't
work on v6.2 kernel. That's unfortunate but I don't know what's the
correct way to handle it.
For now, let's skip v6.2 kernels explicitly (if failed) in the test.
Fixes:
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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 Restructured Text 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.