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e4c057d02c
GRU is already using almost the same algorithm as get/put, it even helpfully has a 10 year old comment to make this algorithm common, which is finally happening. There are a few differences and fixes from this conversion: - GRU used rcu not srcu to read the hlist - Unclear how the locking worked to prevent gru_register_mmu_notifier() from running concurrently with gru_drop_mmu_notifier() - this version is safe - GRU had a release function which only set a variable without any locking that skiped the synchronize_srcu during unregister which looks racey, but this makes it reliable via the integrated call_srcu(). - It is unclear if the mmap_sem is actually held when __mmu_notifier_register() was called, lockdep will now warn if this is wrong Link: https://lore.kernel.org/r/20190806231548.25242-5-jgg@ziepe.ca Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dimitri Sivanich <sivanich@hpe.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> |
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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.