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4840ce2267
When enabling CONFIG_LOCK_STAT=y, then CONFIG_LOCKDEP=y is forcedly enabled, but CONFIG_PROVE_LOCKING is disabled. We can get output from /proc/lockdep, which currently includes usages of lock classes. But the usages are meaningless, see the output below: / # cat /proc/lockdep all lock classes: ffffffff9af63350 ....: cgroup_mutex ffffffff9af54eb8 ....: (console_sem).lock ffffffff9af54e60 ....: console_lock ffffffff9ae74c38 ....: console_owner_lock ffffffff9ae74c80 ....: console_owner ffffffff9ae66e60 ....: cpu_hotplug_lock Only one usage context for each lock, this is because each usage is only changed in mark_lock() that is in the CONFIG_PROVE_LOCKING=y section, however in the test situation, it's not. The fix is to move the usages reading and seq_print from the !CONFIG_PROVE_LOCKING section to its defined section. Also, locks_after list of lock_class is empty when !CONFIG_PROVE_LOCKING, so do the same thing as what have done for usages of lock classes. With this patch with !CONFIG_PROVE_LOCKING we can get the results below: / # cat /proc/lockdep all lock classes: ffffffff85163290: cgroup_mutex ffffffff85154dd8: (console_sem).lock ffffffff85154d80: console_lock ffffffff85074b58: console_owner_lock ffffffff85074ba0: console_owner ffffffff85066d60: cpu_hotplug_lock ... a class key and the relevant class name each line. Signed-off-by: Xiongwei Song <sxwjean@gmail.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Acked-by: Waiman Long <longman@redhat.com> Link: https://lore.kernel.org/r/20210629135916.308210-1-sxwjean@me.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.