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documentation: coccinelle: Improve command example for make C={1,2}

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Modify coccinelle documentation to further clarify
the usage of the makefile C variable by coccicheck.

Signed-off-by: Sumera Priyadarsini <sylphrenadin@gmail.com>
Acked-by: Julia Lawall <julia.lawall@inria.fr>
Link: https://lore.kernel.org/r/20200811002350.5553-1-sylphrenadin@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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Sumera Priyadarsini 2020-08-11 05:53:50 +05:30 committed by Jonathan Corbet
parent ec8213f890
commit a5019c7f56
1 changed files with 11 additions and 4 deletions
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Documentation/dev-tools/coccinelle.rst
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@ -175,13 +175,20 @@ For example, to check drivers/net/wireless/ one may write::
make coccicheck M=drivers/net/wireless/
To apply Coccinelle on a file basis, instead of a directory basis, the
following command may be used::
C variable is used by the makefile to select which files to work with.
This variable can be used to run scripts for the entire kernel, a
specific directory, or for a single file.
make C=1 CHECK="scripts/coccicheck"
For example, to check drivers/bluetooth/bfusb.c, the value 1 is
passed to the C variable to check files that make considers
need to be compiled.::
To check only newly edited code, use the value 2 for the C flag, i.e.::
make C=1 CHECK=scripts/coccicheck drivers/bluetooth/bfusb.o
make C=2 CHECK="scripts/coccicheck"
The value 2 is passed to the C variable to check files regardless of
whether they need to be compiled or not.::
make C=2 CHECK=scripts/coccicheck drivers/bluetooth/bfusb.o
In these modes, which work on a file basis, there is no information
about semantic patches displayed, and no commit message proposed.