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| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-02-11 00:11:42 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-02-13 01:15:53 +0300 |
| commit | 239a5791ffd5559f51815df442c4dbbe7fc21ade (patch) | |
| tree | 0dc0e53ea13d8395f1bf14b8def595b0d0cc1201 /Documentation/admin-guide/dynamic-debug-howto.rst | |
| parent | 3aef021b2df7d8440225a53460c0d34b140297d5 (diff) | |
| download | linux-239a5791ffd5559f51815df442c4dbbe7fc21ade.tar.xz | |
dynamic_debug: allow to work if debugfs is disabled
With the realization that having debugfs enabled on "production" systems
is generally not a good idea, debugfs is being disabled from more and
more platforms over time. However, the functionality of dynamic
debugging still is needed at times, and since it relies on debugfs for
its user api, having debugfs disabled also forces dynamic debug to be
disabled.
To get around this, also create the "control" file for dynamic_debug in
procfs. This allows people turn on debugging as needed at runtime for
individual driverfs and subsystems.
Reported-by: many different companies
Cc: Jason Baron <jbaron@akamai.com>
Acked-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20200210211142.GB1373304@kroah.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/admin-guide/dynamic-debug-howto.rst')
| -rw-r--r-- | Documentation/admin-guide/dynamic-debug-howto.rst | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/admin-guide/dynamic-debug-howto.rst b/Documentation/admin-guide/dynamic-debug-howto.rst index 252e5ef324e5..0dc2eb8e44e5 100644 --- a/Documentation/admin-guide/dynamic-debug-howto.rst +++ b/Documentation/admin-guide/dynamic-debug-howto.rst @@ -54,6 +54,9 @@ If you make a mistake with the syntax, the write will fail thus:: <debugfs>/dynamic_debug/control -bash: echo: write error: Invalid argument +Note, for systems without 'debugfs' enabled, the control file can be +found in ``/proc/dynamic_debug/control``. + Viewing Dynamic Debug Behaviour =============================== |