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Vlastimil Babka 6c6c47b063 mm, slab: call kvfree_rcu_barrier() from kmem_cache_destroy() 
We would like to replace call_rcu() users with kfree_rcu() where the
existing callback is just a kmem_cache_free(). However this causes
issues when the cache can be destroyed (such as due to module unload).

Currently such modules should be issuing rcu_barrier() before
kmem_cache_destroy() to have their call_rcu() callbacks processed first.
This barrier is however not sufficient for kfree_rcu() in flight due
to the batching introduced by a35d16905e ("rcu: Add basic support for
kfree_rcu() batching").

This is not a problem for kmalloc caches which are never destroyed, but
since removing SLOB, kfree_rcu() is allowed also for any other cache,
that might be destroyed.

In order not to complicate the API, put the responsibility for handling
outstanding kfree_rcu() in kmem_cache_destroy() itself. Use the newly
introduced kvfree_rcu_barrier() to wait before destroying the cache.
This is similar to how we issue rcu_barrier() for SLAB_TYPESAFE_BY_RCU
caches, but has to be done earlier, as the latter only needs to wait for
the empty slab pages to finish freeing, and not objects from the slab.

Users of call_rcu() with arbitrary callbacks should still issue
rcu_barrier() before destroying the cache and unloading the module, as
kvfree_rcu_barrier() is not a superset of rcu_barrier() and the
callbacks may be invoking module code or performing other actions that
are necessary for a successful unload.

Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
2024-08-27 14:12:51 +02:00
arch s390 updates for 6.11-rc5 2024-08-25 12:05:23 +12:00
block
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Documentation workqueue: Fixes for v6.11-rc4 2024-08-24 10:35:57 +08:00
drivers s390 updates for 6.11-rc5 2024-08-25 12:05:23 +12:00
fs bcachefs fixes for 6.11-rc5, v2 2024-08-25 17:20:48 +12:00
include rcu/kvfree: Add kvfree_rcu_barrier() API 2024-08-27 14:12:51 +02:00
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kernel rcu/kvfree: Add kvfree_rcu_barrier() API 2024-08-27 14:12:51 +02:00
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mm mm, slab: call kvfree_rcu_barrier() from kmem_cache_destroy() 2024-08-27 14:12:51 +02:00
net NFS Client Bugfixes for Linux 6.11-rc 2024-08-24 09:03:25 +08:00
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MAINTAINERS SCSI fixes on 20240824 2024-08-25 12:00:16 +12:00
Makefile Linux 6.11-rc5 2024-08-25 19:07:11 +12:00
README

README 

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.