path: root/mm/migrate.c
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authorMrinal Pandey <>2020-09-04 16:35:52 -0700
committerLinus Torvalds <>2020-09-05 12:14:29 -0700
commit13e45417cedbfc44b1926124b1846f5ee8c6ba4a (patch)
treebfc3670e1d5bb55b55ef0621d7217fe3548e3eb8 /mm/migrate.c
parentb0daa2c73f3a8ab9183a9d298495b583b6c1bd19 (diff)
checkpatch: fix the usage of capture group ( ... )
The usage of "capture group (...)" in the immediate condition after `&&` results in `$1` being uninitialized. This issues a warning "Use of uninitialized value $1 in regexp compilation at ./scripts/ line 2638". I noticed this bug while running checkpatch on the set of commits from v5.7 to v5.8-rc1 of the kernel on the commits with a diff content in their commit message. This bug was introduced in the script by commit e518e9a59ec3 ("checkpatch: emit an error when there's a diff in a changelog"). It has been in the script since then. The author intended to store the match made by capture group in variable `$1`. This should have contained the name of the file as `[\w/]+` matched. However, this couldn't be accomplished due to usage of capture group and `$1` in the same regular expression. Fix this by placing the capture group in the condition before `&&`. Thus, `$1` can be initialized to the text that capture group matches thereby setting it to the desired and required value. Fixes: e518e9a59ec3 ("checkpatch: emit an error when there's a diff in a changelog") Signed-off-by: Mrinal Pandey <> Signed-off-by: Andrew Morton <> Tested-by: Lukas Bulwahn <> Reviewed-by: Lukas Bulwahn <> Cc: Joe Perches <> Link: Signed-off-by: Linus Torvalds <>
Diffstat (limited to 'mm/migrate.c')
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