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160216568c
The disable path uses three big locks - scx_fork_rwsem, scx_cgroup_rwsem and cpus_read_lock. Currently, the locks are grabbed together which is prone to locking order problems. With the preceding scx_cgroup_enabled change, we can decouple them: - As cgroup disabling no longer requires modifying a static_key which requires cpus_read_lock(), no need to grab cpus_read_lock() before grabbing scx_cgroup_rwsem. - cgroup can now be independently disabled before tasks are moved back to the fair class. Relocate scx_cgroup_exit() invocation before scx_fork_rwsem is grabbed, drop now unnecessary cpus_read_lock() and move static_key operations out of scx_fork_rwsem. This decouples all three locks in the disable path. Signed-off-by: Tejun Heo <tj@kernel.org> Reported-and-tested-by: Aboorva Devarajan <aboorvad@linux.ibm.com> Link: http://lkml.kernel.org/r/8cd0ec0c4c7c1bc0119e61fbef0bee9d5e24022d.camel@linux.ibm.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 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.