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Unlike relocation, scrub never checks pending signals, and even for relocation is only explicitly checking for fatal signal (SIGKILL), not for regular ones. Thankfully relocation can still be interrupted by regular signals by the usage of wait_on_bit(), which is called with TASK_INTERRUPTIBLE. Do the same for scrub/dev-replace, so that regular signals can also cancel the scrub/replace run, and more importantly handle v2 cgroup freezing which is based on signal handling code inside the kernel, and freezing() function will not return true for v2 cgroup freezing. This will address the problem that systemd slice freezing will timeout on long running scrub/dev-replace. Reviewed-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Qu Wenruo <wqu@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.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.