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fed8f5090c
Pull percpu_ref rcu fixes from Tejun Heo:
"Jann Horn found that aio was depending on the internal RCU grace
periods of percpu-ref and that it's broken because aio uses regular
RCU while percpu_ref uses sched-RCU.
Depending on percpu_ref's internal grace periods isn't a good idea
because
- The RCU type might not match.
- percpu_ref's grace periods are used to switch to atomic mode. They
aren't between the last put and the invocation of the last release.
This is easy to get confused about and can lead to subtle bugs.
- percpu_ref might not have grace periods at all depending on its
current operation mode.
This patchset audits and fixes percpu_ref users for their RCU usages"
[ There's a continuation of this series that clarifies percpu_ref
documentation that the internal grace periods must not be depended
upon, and introduces rcu_work to simplify bouncing to a workqueue
after an RCU grace period.
That will go in for 4.17 - this is just the minimal set with the fixes
that are tagged for -stable ]
* 'percpu_ref-rcu-audit-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc:
RDMAVT: Fix synchronization around percpu_ref
fs/aio: Use RCU accessors for kioctx_table->table[]
fs/aio: Add explicit RCU grace period when freeing kioctx
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.