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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@sk2.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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@ -387,7 +387,19 @@ This flag controls the L2 cache of G3 processor boards. If
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modprobe
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========
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See Documentation/debugging-modules.txt.
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This gives the full path of the modprobe command which the kernel will
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use to load modules. This can be used to debug module loading
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requests::
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echo '#! /bin/sh' > /tmp/modprobe
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echo 'echo "$@" >> /tmp/modprobe.log' >> /tmp/modprobe
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echo 'exec /sbin/modprobe "$@"' >> /tmp/modprobe
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chmod a+x /tmp/modprobe
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echo /tmp/modprobe > /proc/sys/kernel/modprobe
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This only applies when the *kernel* is requesting that the module be
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loaded; it won't have any effect if the module is being loaded
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explicitly using ``modprobe`` from userspace.
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modules_disabled
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@ -1,22 +0,0 @@
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Debugging Modules after 2.6.3
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-----------------------------
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In almost all distributions, the kernel asks for modules which don't
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exist, such as "net-pf-10" or whatever. Changing "modprobe -q" to
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"succeed" in this case is hacky and breaks some setups, and also we
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want to know if it failed for the fallback code for old aliases in
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fs/char_dev.c, for example.
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In the past a debugging message which would fill people's logs was
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emitted. This debugging message has been removed. The correct way
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of debugging module problems is something like this:
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echo '#! /bin/sh' > /tmp/modprobe
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echo 'echo "$@" >> /tmp/modprobe.log' >> /tmp/modprobe
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echo 'exec /sbin/modprobe "$@"' >> /tmp/modprobe
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chmod a+x /tmp/modprobe
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echo /tmp/modprobe > /proc/sys/kernel/modprobe
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Note that the above applies only when the *kernel* is requesting
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that the module be loaded -- it won't have any effect if that module
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is being loaded explicitly using "modprobe" from userspace.
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