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e43c0a0c3c
This performs lazy tlb mm shootdown when doing the exit TLB flush when all mm users go away and user mappings are removed, which avoids having to do the lazy tlb mm shootdown IPIs on the final mmput when all kernel references disappear. powerpc/64s uses a broadcast TLBIE for the exit TLB flush if remote CPUs need to be invalidated (unless TLBIE is disabled), so this doesn't necessarily save IPIs but it does avoid a broadcast TLBIE which is quite expensive. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> [mpe: Squash in preempt_disable/enable() fix from Nick] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://msgid.link/20230524060821.148015-5-npiggin@gmail.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.