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Date: Tue, 09 Jun 2015 22:52:29 -0700 From: Joe Perches <joe@...ches.com> To: Andrew Morton <akpm@...ux-foundation.org> Cc: Julia Lawall <julia.lawall@...6.fr>, Sergey Senozhatsky <sergey.senozhatsky@...il.com>, Minchan Kim <minchan@...nel.org>, Christoph Lameter <cl@...ux.com>, Pekka Enberg <penberg@...nel.org>, Joonsoo Kim <iamjoonsoo.kim@....com>, Michal Hocko <mhocko@...e.cz>, David Rientjes <rientjes@...gle.com>, linux-mm@...ck.org, linux-kernel@...r.kernel.org, sergey.senozhatsky.work@...il.com Subject: [PATCH V2] checkpatch: Add some <foo>_destroy functions to NEEDLESS_IF tests Sergey Senozhatsky has modified several destroy functions that can now be called with NULL values. - kmem_cache_destroy() - mempool_destroy() - dma_pool_destroy() Update checkpatch to warn when those functions are preceded by an if. Update checkpatch to --fix all the calls too only when the code style form is using leading tabs. from: if (foo) <func>(foo); to: <func>(foo); Signed-off-by: Joe Perches <joe@...ches.com> --- V2: Remove useless debugging print messages and multiple quotemetas scripts/checkpatch.pl | 32 ++++++++++++++++++++++++++++---- 1 file changed, 28 insertions(+), 4 deletions(-) diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl index 69c4716..87d3bf1aa 100755 --- a/scripts/checkpatch.pl +++ b/scripts/checkpatch.pl @@ -4800,10 +4800,34 @@ sub process { # check for needless "if (<foo>) fn(<foo>)" uses if ($prevline =~ /\bif\s*\(\s*($Lval)\s*\)/) { - my $expr = '\s*\(\s*' . quotemeta($1) . '\s*\)\s*;'; - if ($line =~ /\b(kfree|usb_free_urb|debugfs_remove(?:_recursive)?)$expr/) { - WARN('NEEDLESS_IF', - "$1(NULL) is safe and this check is probably not required\n" . $hereprev); + my $tested = quotemeta($1); + my $expr = '\s*\(\s*' . $tested . '\s*\)\s*;'; + if ($line =~ /\b(kfree|usb_free_urb|debugfs_remove(?:_recursive)?|(?:kmem_cache|mempool|dma_pool)_destroy)$expr/) { + my $func = $1; + if (WARN('NEEDLESS_IF', + "$func(NULL) is safe and this check is probably not required\n" . $hereprev) && + $fix) { + my $do_fix = 1; + my $leading_tabs = ""; + my $new_leading_tabs = ""; + if ($lines[$linenr - 2] =~ /^\+(\t*)if\s*\(\s*$tested\s*\)\s*$/) { + $leading_tabs = $1; + } else { + $do_fix = 0; + } + if ($lines[$linenr - 1] =~ /^\+(\t+)$func\s*\(\s*$tested\s*\)\s*;\s*$/) { + $new_leading_tabs = $1; + if (length($leading_tabs) + 1 ne length($new_leading_tabs)) { + $do_fix = 0; + } + } else { + $do_fix = 0; + } + if ($do_fix) { + fix_delete_line($fixlinenr - 1, $prevrawline); + $fixed[$fixlinenr] =~ s/^\+$new_leading_tabs/\+$leading_tabs/; + } + } } } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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