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Such spinlock is currently used only to protect the 'owned' flag inside the socket lock itself. With this patch, we extend its scope to protect the whole msk receive path and sk_forward_memory. Given the above, we can always move data into the msk receive queue (and OoO queue) from the subflow. We leverage the previous commit, so that we need to acquire the spinlock in the tx path only when moving fwd memory. recvmsg() must now explicitly acquire the socket spinlock when moving skbs out of sk_receive_queue. To reduce the number of lock operations required we use a second rx queue and splice the first into the latter in mptcp_lock_sock(). Additionally rmem allocated memory is bulk-freed via release_cb() Acked-by: Florian Westphal <fw@strlen.de> Co-developed-by: Florian Westphal <fw@strlen.de> Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Paolo Abeni <pabeni@redhat.com> Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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.