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32707c4dfa
The smp_store_release call in fqdir_exit cannot protect the setting of fqdir->dead as claimed because its memory barrier is only guaranteed to be one-way and the barrier precedes the setting of fqdir->dead. IOW it doesn't provide any barriers between fq->dir and the following hash table destruction. In fact, the code is safe anyway because call_rcu does provide both the memory barrier as well as a guarantee that when the destruction work starts executing all RCU readers will see the updated value for fqdir->dead. Therefore this patch removes the unnecessary smp_store_release call as well as the corresponding READ_ONCE on the read-side in order to not confuse future readers of this code. Comments have been added in their places. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Reviewed-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net> |
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| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| 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 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.