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770b1d216d
raid_run_ops() relies on the implicitly disabled preemption for its percpu ops, although this is really about CPU locality. This breaks RT semantics as it can take regular (and thus sleeping) spinlocks, such as stripe_lock. Add a local_lock such that non-RT does not change and continues to be just map to preempt_disable/enable, but makes RT happy as the region will use a per-CPU spinlock and thus be preemptible and still guarantee CPU locality. Signed-off-by: Davidlohr Bueso <dbueso@suse.de> Signed-off-by: Song Liu <songliubraving@fb.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.