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401597485c
This patch will remove the following warning by sparse: fs/dlm/lock.c:1049:9: warning: context imbalance in 'dlm_master_lookup' - different lock contexts for basic block I tried to find any issues with the current handling and I did not find any. However it is hard to follow the lock handling in this area of dlm_master_lookup() and I suppose that sparse cannot realize that there are no issues. The variable "toss_list" makes it really hard to follow the lock handling because if it's set the rsb lock/refcount isn't held but the ls->ls_rsbtbl[b].lock is held and this is one reason why the rsb lock/refcount does not need to be held. If it's not set the ls->ls_rsbtbl[b].lock is not held but the rsb lock/refcount is held. The indicator of toss_list will be used to store the actual lock state. Another possibility is that a retry can happen and then it's hard to follow the specific code part. I did not find any issues but sparse cannot realize that there are no issues. To make it more easier to understand for developers and sparse as well, we remove the toss_list variable which indicates a specific lock state and move handling in between of this lock state in a separate function. This function can be called now in case when the initial lock states are taken which was previously signalled if toss_list was set or not. The advantage here is that we can release all locks/refcounts in mostly the same code block as it was taken. Afterwards sparse had no issues to figure out that there are no problems with the current lock behaviour. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.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.