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916e3a4f95
If the PMU is broken due to firmware issues, check_hw_exists() will return false but perf_get_x86_pmu_capability() will still return data from x86_pmu. Likewise if some of the hotplug callbacks cannot be installed the contents of x86_pmu will not be reverted. Handle the failure in both cases by clearing x86_pmu if init_hw_perf_events() or reverts to software events only. Co-developed-by: Like Xu <likexu@tencent.com> Signed-off-by: Like Xu <likexu@tencent.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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.