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UPSTREAM: docs: binderfs: add section about feature files

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Document how binder feature files can be used to determine whether a
feature is supported by the binder driver. "oneway_spam_detection" is
used as an example as it is the first available feature file.

Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Carlos Llamas <cmllamas@google.com>
Link: https://lore.kernel.org/r/20210715031805.1725878-2-cmllamas@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 06e1721d2a265d1247093f5ad5ae2958ef10a604)
Bug: 191910201
Signed-off-by: Carlos Llamas <cmllamas@google.com>
Change-Id: I9c4542e0ee65dd94a492fe0440ba8f1a48d8b797
This commit is contained in:
Carlos Llamas 2021-07-15 03:18:04 +00:00 committed by Ksawlii
parent c20a164edd
commit 69a19b9b53
1 changed files with 13 additions and 0 deletions
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13
Documentation/admin-guide/binderfs.rst
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@ -72,3 +72,16 @@ that the `rm() <rm_>`_ tool can be used to delete them. Note that the
``binder-control`` device cannot be deleted since this would make the binderfs ``binder-control`` device cannot be deleted since this would make the binderfs
instance unuseable. The ``binder-control`` device will be deleted when the instance unuseable. The ``binder-control`` device will be deleted when the
binderfs instance is unmounted and all references to it have been dropped. binderfs instance is unmounted and all references to it have been dropped.
Binder features
---------------
Assuming an instance of binderfs has been mounted at ``/dev/binderfs``, the
features supported by the binder driver can be located under
``/dev/binderfs/features/``. The presence of individual files can be tested
to determine whether a particular feature is supported by the driver.
Example::
cat /dev/binderfs/features/oneway_spam_detection
1