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authorLinus Torvalds <torvalds@linux-foundation.org>2020-03-30 12:45:23 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-03-30 12:45:23 -0700
commit481ed297d900af0ce395f6ca8975903b76a5a59e (patch)
treee3862e9993cd8e2245c5a6d632f45dd3f77d1d62 /Documentation/debugging-modules.txt
parente59cd88028dbd41472453e5883f78330aa73c56e (diff)
parentabcb1e021ae5a36374c635eeaba5cec733169b78 (diff)
Merge tag 'docs-5.7' of git://git.lwn.net/linux
Pull documentation updates from Jonathan Corbet: "This has been a busy cycle for documentation work. Highlights include: - Lots of RST conversion work by Mauro, Daniel ALmeida, and others. Maybe someday we'll get to the end of this stuff...maybe... - Some organizational work to bring some order to the core-api manual. - Various new docs and additions to the existing documentation. - Typo fixes, warning fixes, ..." * tag 'docs-5.7' of git://git.lwn.net/linux: (123 commits) Documentation: x86: exception-tables: document CONFIG_BUILDTIME_TABLE_SORT MAINTAINERS: adjust to filesystem doc ReST conversion docs: deprecated.rst: Add BUG()-family doc: zh_CN: add translation for virtiofs doc: zh_CN: index files in filesystems subdirectory docs: locking: Drop :c:func: throughout docs: locking: Add 'need' to hardirq section docs: conf.py: avoid thousands of duplicate label warning on Sphinx docs: prevent warnings due to autosectionlabel docs: fix reference to core-api/namespaces.rst docs: fix pointers to io-mapping.rst and io_ordering.rst files Documentation: Better document the softlockup_panic sysctl docs: hw-vuln: tsx_async_abort.rst: get rid of an unused ref docs: perf: imx-ddr.rst: get rid of a warning docs: filesystems: fuse.rst: supress a Sphinx warning docs: translations: it: avoid duplicate refs at programming-language.rst docs: driver.rst: supress two ReSt warnings docs: trace: events.rst: convert some new stuff to ReST format Documentation: Add io_ordering.rst to driver-api manual Documentation: Add io-mapping.rst to driver-api manual ...
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-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.