From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751914AbaJAOH2 (ORCPT ); Wed, 1 Oct 2014 10:07:28 -0400 Received: from mout.web.de ([212.227.15.14]:59375 "EHLO mout.web.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751155AbaJAOHZ (ORCPT ); Wed, 1 Oct 2014 10:07:25 -0400 Message-ID: <542C0A90.3080702@users.sourceforge.net> Date: Wed, 01 Oct 2014 16:07:12 +0200 From: SF Markus Elfring User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.1.2 MIME-Version: 1.0 To: linux-kernel@vger.kernel.org, Andrew Morton , Stephen Rothwell CC: Coccinelle , kernel-janitors@vger.kernel.org, Michal Marek , Chi Pham , Fabian Frederick , Joe Perches Subject: Re: [coccicheck PATCH 4/5] Deletion of unnecessary checks before specific function calls References: <5307CAA2.8060406@users.sourceforge.net> <530A086E.8010901@users.sourceforge.net> <530A72AA.3000601@users.sourceforge.net> <530B5FB6.6010207@users.sourceforge.net> <530C5E18.1020800@users.sourceforge.net> <530CD2C4.4050903@users.sourceforge.net> <530CF8FF.8080600@users.sourceforge.net> <530DD06F.4090703@users.sourceforge.net> <5317A59D.4@users.sourceforge.net> <542BFB2C.5070609@users.sourceforge.net> In-Reply-To: <542BFB2C.5070609@users.sourceforge.net> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit X-Provags-ID: V03:K0:w7kxGSGhYkkn2cCMQ8QYAC0DoCw18unU2LpdtkMJNXL7S1sOwEM s02n1an3cc+cE+gmxZyCHuybRWh/+ONvM4mDLodWKcWSQI5Da2fU7mxSBoumUfl9Y9MjD3E apI5xlnP/dAZ9urgQAqg13J4MKD9ORaHhuDldFjbTshnmDG3gHoeTuwb62dpfgANda4V6IR dmtG9KK+S3tVISFGbbfbA== X-UI-Out-Filterresults: notjunk:1; Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org >>> If you are convinced that dropping the null tests is a good idea, then you >>> can submit the patch that makes the change to the relevant maintainers and >>> mailing lists. >>From e6a21b920fcca2f6f01c9528909dc036a9b3bc41 Mon Sep 17 00:00:00 2001 From: Markus Elfring Date: Wed, 5 Mar 2014 19:10:32 +0100 Subject: [PATCH 4/5] Addition of a semantic patch file for listing of unnecessary checks before a few known functions This semantic patch pattern tries to find source code places where a check is performed for an expression that is passed to a function (like "kfree") which checks this single parameter itself for usability. Redundant value or pointer checks can be avoided here. The pattern contains a special comment in a regular expression for a SmPL constraint which supports extensions. It uses Python statements to write information about the found places in a data format that is a variant of a CSV text file. Signed-off-by: Markus Elfring --- ...nctions_with_unnecessary_checks_template1.cocci | 59 ++++++++++++++++++++++ 1 file changed, 59 insertions(+) create mode 100644 scripts/coccinelle/deletions/list_functions_with_unnecessary_checks_template1.cocci diff --git a/scripts/coccinelle/deletions/list_functions_with_unnecessary_checks_template1.cocci b/scripts/coccinelle/deletions/list_functions_with_unnecessary_checks_template1.cocci new file mode 100644 index 0000000..d2637e8 --- /dev/null +++ b/scripts/coccinelle/deletions/list_functions_with_unnecessary_checks_template1.cocci @@ -0,0 +1,59 @@ +@initialize:python@ +@@ +import sys +result = [] +mark = ['"', '', '"'] +delimiter = '|' + +def store_positions(fun, point, places): + """Add source code positions to an internal list.""" + for place in places: + fields = [] + fields.append(fun) + + fields.append(point) + + mark[1] = place.file.replace('"', '""') + fields.append(''.join(mark)) + + fields.append(place.line) + fields.append(str(int(place.column) + 1)) + result.append(delimiter.join(fields)) + +@is_unnecessary_check@ +expression data; +identifier work; +identifier release =~ "^(?x) +(?: + (?:kz?|slob_)free +| + (?: +# Alternation placeholder + ) +)$"; +position pos; +type t; +@@ + t work@pos(...) + { + ... when any +( if (data) release(data); +| if (likely(data)) release(data); +) + ... when any + } + +@script:python collection depends on is_unnecessary_check@ +fun << is_unnecessary_check.work; +point << is_unnecessary_check.data; +places << is_unnecessary_check.pos; +@@ +store_positions(fun, point, places) + +@finalize:python@ +@@ +if result: + result.insert(0, delimiter.join(("function", '"parameter"', '"source file"', "line", "column"))) + print("\r\n".join(result)) +else: + sys.stderr.write("No result for this analysis!\n") -- 1.9.0