mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-03-14 08:50:45 -04:00
97d0dca794
Petr Machata says:
====================
mlxsw: Avoid non-tracker helpers when holding and putting netdevices
Using the tracking helpers, netdev_hold() and netdev_put(), makes it easier
to debug netdevice refcount imbalances when CONFIG_NET_DEV_REFCNT_TRACKER
is enabled. For example, the following traceback shows the callpath to the
point of an outstanding hold that was never put:
unregister_netdevice: waiting for swp3 to become free. Usage count = 6
ref_tracker: eth%d@ffff888123c9a580 has 1/5 users at
mlxsw_sp_switchdev_event+0x6bd/0xcc0 [mlxsw_spectrum]
notifier_call_chain+0xbf/0x3b0
atomic_notifier_call_chain+0x78/0x200
br_switchdev_fdb_notify+0x25f/0x2c0 [bridge]
fdb_notify+0x16a/0x1a0 [bridge]
[...]
In this patchset, get rid of all non-ref-tracking helpers in mlxsw.
- Patch #1 drops two functions that are not used anymore, but contain
dev_hold() / dev_put() calls.
- Patch #2 avoids taking a reference in one function which is called
under RTNL.
- The remaining patches convert individual hold/put sites one by one
from trackerless to tracker-enabled.
Suggested-by: Paolo Abeni <pabeni@redhat.com>
Link: https://lore.kernel.org/netdev/4c056da27c19d95ffeaba5acf1427ecadfc3f94c.camel@redhat.com/
====================
Link: https://lore.kernel.org/r/cover.1690471774.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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.