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027440b5d4
For intel_pmu_en/disable_event(), reorder the branches checks for hw->idx and make them sorted by probability: gp,fixed,bts,others. Clean up the x86_assign_hw_event() by converting multiple if-else statements to a switch statement. To skip x86_perf_event_update() and x86_perf_event_set_period(), it's generic to replace "idx == INTEL_PMC_IDX_FIXED_BTS" check with '!hwc->event_base' because that should be 0 for all non-gp/fixed cases. Wrap related bit operations into intel_set/clear_masks() and make the main path more cleaner and readable. No functional changes. Signed-off-by: Like Xu <like.xu@linux.intel.com> Original-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20200613080958.132489-3-like.xu@linux.intel.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.