linux-kernel - [PATCH v2 2/8] docs: merge debugging-modules.txt into sysctl/kernel.rst

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Message-Id: <20200218125923.685-3-steve@sk2.org>
Date:   Tue, 18 Feb 2020 13:59:17 +0100
From:   Stephen Kitt <steve@....org>
To:     Jonathan Corbet <corbet@....net>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        linux-doc@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Stephen Kitt <steve@....org>
Subject: [PATCH v2 2/8] docs: merge debugging-modules.txt into sysctl/kernel.rst

This fits nicely in sysctl/kernel.rst, merge it (and rephrase it)
instead of linking to it.

Signed-off-by: Stephen Kitt <steve@....org>
---
 Documentation/admin-guide/sysctl/kernel.rst | 14 ++++++++++++-
 Documentation/debugging-modules.txt         | 22 ---------------------
 2 files changed, 13 insertions(+), 23 deletions(-)
 delete mode 100644 Documentation/debugging-modules.txt

diff --git a/Documentation/admin-guide/sysctl/kernel.rst b/Documentation/admin-guide/sysctl/kernel.rst
index c17ed1db8eea..392c6be1424d 100644
--- a/Documentation/admin-guide/sysctl/kernel.rst
+++ b/Documentation/admin-guide/sysctl/kernel.rst
@@ -386,7 +386,19 @@ This flag controls the L2 cache of G3 processor boards. If
 modprobe
 ========
 
-See Documentation/debugging-modules.txt.
+This gives the full path of the modprobe command which the kernel will
+use to load modules. This can be used to debug module loading
+requests::
+
+    echo '#! /bin/sh' > /tmp/modprobe
+    echo 'echo "$@" >> /tmp/modprobe.log' >> /tmp/modprobe
+    echo 'exec /sbin/modprobe "$@"' >> /tmp/modprobe
+    chmod a+x /tmp/modprobe
+    echo /tmp/modprobe > /proc/sys/kernel/modprobe
+
+This only applies when the *kernel* is requesting that the module be
+loaded; it won't have any effect if the module is being loaded
+explicitly using ``modprobe`` from userspace.
 
 
 modules_disabled
diff --git a/Documentation/debugging-modules.txt b/Documentation/debugging-modules.txt
deleted file mode 100644
index 172ad4aec493..000000000000
--- a/Documentation/debugging-modules.txt
+++ /dev/null
@@ -1,22 +0,0 @@
-Debugging Modules after 2.6.3
------------------------------
-
-In almost all distributions, the kernel asks for modules which don't
-exist, such as "net-pf-10" or whatever.  Changing "modprobe -q" to
-"succeed" in this case is hacky and breaks some setups, and also we
-want to know if it failed for the fallback code for old aliases in
-fs/char_dev.c, for example.
-
-In the past a debugging message which would fill people's logs was
-emitted.  This debugging message has been removed.  The correct way
-of debugging module problems is something like this:
-
-echo '#! /bin/sh' > /tmp/modprobe
-echo 'echo "$@" >> /tmp/modprobe.log' >> /tmp/modprobe
-echo 'exec /sbin/modprobe "$@"' >> /tmp/modprobe
-chmod a+x /tmp/modprobe
-echo /tmp/modprobe > /proc/sys/kernel/modprobe
-
-Note that the above applies only when the *kernel* is requesting
-that the module be loaded -- it won't have any effect if that module
-is being loaded explicitly using "modprobe" from userspace.
-- 
2.20.1