Require the MAINTAINERS V: entries to begin with a keyword, one of
SUGGESTED/RECOMMENDED/REQUIRED, signifying how strongly the test is
proposed for verifying the subsystem changes, prompting
scripts/checkpatch.pl to produce CHECK/WARNING/ERROR messages
respectively, whenever the commit message doesn't have the corresponding
Tested-with: tag.

Signed-off-by: Nikolai Kondrashov <[email protected]>
---
 Documentation/process/submitting-patches.rst | 11 ++-
 MAINTAINERS                                  | 20 +++--
 scripts/checkpatch.pl                        | 83 ++++++++++++--------
 3 files changed, 71 insertions(+), 43 deletions(-)

diff --git a/Documentation/process/submitting-patches.rst 
b/Documentation/process/submitting-patches.rst
index 45bd1a713ef33..199fadc50cf62 100644
--- a/Documentation/process/submitting-patches.rst
+++ b/Documentation/process/submitting-patches.rst
@@ -233,18 +233,21 @@ Test your changes
 
 Test the patch to the best of your ability. Check the MAINTAINERS file for the
 subsystem(s) you are changing to see if there are any **V:** entries
-proposing particular test suites, either directly as commands, or via
-documentation references.
+proposing particular test suites.
+
+The **V:** entries start with a proposal strength keyword
+(SUGGESTED/RECOMMENDED/REQUIRED), followed either by a command, or a
+documentation reference.
 
 Test suite references start with a ``*`` (similar to C pointer dereferencing),
 followed by the name of the test suite, which would be documented in the
 Documentation/process/tests.rst under the corresponding heading. E.g.::
 
-  V: *xfstests
+  V: SUGGESTED *xfstests
 
 Anything not starting with a ``*`` is considered a command. E.g.::
 
-  V: tools/testing/kunit/run_checks.py
+  V: RECOMMENDED tools/testing/kunit/run_checks.py
 
 Supplying the ``--test`` option to ``scripts/get_maintainer.pl`` adds **V:**
 entries to its output.
diff --git a/MAINTAINERS b/MAINTAINERS
index 84e90ec015090..3a35e320b5a5b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -59,15 +59,19 @@ Descriptions of section entries and preferred order
              matches patches or files that contain one or more of the words
              printk, pr_info or pr_err
           One regex pattern per line.  Multiple K: lines acceptable.
-       V: *Test suite* proposed for execution. The command that could be
-          executed to verify changes to the maintained subsystem, or a 
reference
-          to a test suite documented in Documentation/process/tests.txt.
+       V: *Test suite* proposed for execution for verifying changes to the
+          maintained subsystem. Must start with a proposal strength keyword:
+          (SUGGESTED/RECOMMENDED/REQUIRED), followed by the test suite command,
+          or a reference to a test suite documented in
+          Documentation/process/tests.txt.
+          Proposal strengths correspond to checkpatch.pl message levels
+          (CHECK/WARNING/ERROR respectively, whenever Tested-with: is missing).
           Commands must be executed from the root of the source tree.
           Commands must support the -h/--help option.
           References must be preceded with a '*'.
           Cannot contain '@' or '#' characters.
-          V: tools/testing/kunit/run_checks.py
-          V: *xfstests
+          V: SUGGESTED tools/testing/kunit/run_checks.py
+          V: RECOMMENDED *xfstests
           One test suite per line.
 
 Maintainers List
@@ -7978,7 +7982,7 @@ L:        [email protected]
 S:     Maintained
 W:     http://ext4.wiki.kernel.org
 Q:     http://patchwork.ozlabs.org/project/linux-ext4/list/
-V:     *kvm-xfstests smoke
+V:     RECOMMENDED *kvm-xfstests smoke
 T:     git git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git
 F:     Documentation/filesystems/ext4/
 F:     fs/ext4/
@@ -11628,7 +11632,7 @@ L:      [email protected]
 L:     [email protected]
 S:     Maintained
 W:     https://google.github.io/kunit-docs/third_party/kernel/docs/
-V:     tools/testing/kunit/run_checks.py
+V:     RECOMMENDED tools/testing/kunit/run_checks.py
 T:     git 
git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest.git kunit
 T:     git 
git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest.git 
kunit-fixes
 F:     Documentation/dev-tools/kunit/
@@ -18367,7 +18371,7 @@ REGISTER MAP ABSTRACTION
 M:     Mark Brown <[email protected]>
 L:     [email protected]
 S:     Supported
-V:     *kunit
+V:     RECOMMENDED *kunit
 T:     git git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap.git
 F:     Documentation/devicetree/bindings/regmap/
 F:     drivers/base/regmap/
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index bfeb4c33b5424..9438e4f452a6c 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -1181,39 +1181,57 @@ sub is_maintained_obsolete {
        return $maintained_status{$filename} =~ /obsolete/i;
 }
 
-# Test suites proposed per changed file
+# A list of test proposal strength keywords, weakest to strongest
+our @test_proposal_strengths = qw(suggested recommended required);
+# A regular expression string matching test proposal strength keywords
+my $test_proposal_strengths_res = join('|', @test_proposal_strengths);
+# A regular expression matching valid values of MAINTAINERS V: entries
+# Puts proposal strength into $1 and the test into $2
+my $test_proposal_entry_re = 
qr/^\s*($test_proposal_strengths_res)\s+([^@#]+?)\s*$/i;
+
+# A hashmap of changed files and references to hashmaps of test suites and the
+# strength (0-2) of their proposal
 our %files_proposed_tests = ();
 
-# Return a list of test suites proposed for execution for a particular file
+# Return a reference to a hashmap of test suites proposed for execution for a
+# particular file, and their proposal strengths - 0, 1, or 2 for
+# SUGGESTED/RECOMMENDED/REQUIRED respectively.
 sub get_file_proposed_tests {
        my ($filename) = @_;
-       my $file_proposed_tests;
 
-       return () if (!$tree || !(-e "$root/scripts/get_maintainer.pl"));
+       return {} if (!$tree || !(-e "$root/scripts/get_maintainer.pl"));
 
        if (!exists($files_proposed_tests{$filename})) {
+               # Retrieve and parse the entries
+               my %file_proposed_tests = ();
                my $command = "perl $root/scripts/get_maintainer.pl --test 
--multiline --nogit --nogit-fallback -f $filename";
                # Ignore warnings on stderr
                my $output = `$command 2>/dev/null`;
                # But regenerate stderr on failure
                die "Failed retrieving tests proposed for changes to 
\"$filename\":\n" . `$command 2>&1 >/dev/null` if ($?);
-               $file_proposed_tests = [grep { !/@/ } split("\n", $output)];
-               # Validate and normalize all references
-               for my $index (0 .. scalar @$file_proposed_tests - 1) {
-                       my $test = $file_proposed_tests->[$index];
-                       if ($test =~ /^\*\s*(.*)$/) {
-                               my $name = $1;
-                               die "Test $name referenced in MAINTAINERS not 
found in $testsrelfile\n"
-                                       if (!exists $tests{$name});
-                               $file_proposed_tests->[$index] = "*" . $name;
+               # For each non-email line (a V: entry)
+               foreach my $entry (grep { !/@/ } split("\n", $output)) {
+                       # Extract the strength and the test
+                       if ($entry =~ $test_proposal_entry_re) {
+                               my $strength = grep { 
$test_proposal_strengths[$_] eq lc($1) }
+                                               0..$#test_proposal_strengths;
+                               my $test = $2;
+                               # Validate and normalize references
+                               if ($test =~ /^\*\s*(.*)$/) {
+                                       my $name = $1;
+                                       die "Test $name referenced in 
MAINTAINERS not found in $testsrelfile\n"
+                                               if (!exists $tests{$name});
+                                       $test = "*" . $name;
+                               }
+                               $file_proposed_tests{$test} = $strength;
+                       } else {
+                               die "Invalid MAINTAINERS V: entry: $entry\n";
                        }
                }
-               $files_proposed_tests{$filename} = $file_proposed_tests;
-       } else {
-               $file_proposed_tests = $files_proposed_tests{$filename};
+               $files_proposed_tests{$filename} = \%file_proposed_tests;
        }
 
-       return @$file_proposed_tests;
+       return $files_proposed_tests{$filename};
 }
 
 sub is_SPDX_License_valid {
@@ -2761,7 +2779,7 @@ sub process {
        my @setup_docs = ();
        my $setup_docs = 0;
 
-       # Test suites which should not be proposed for execution
+       # Maximum strength (0-2) of test proposals to be ignored
        my %dont_propose_tests = ();
 
        my $camelcase_file_seeded = 0;
@@ -2983,8 +3001,10 @@ sub process {
                        }
 
                        # Check if tests are proposed for changes to the file
-                       foreach my $test (get_file_proposed_tests($realfile)) {
-                               next if exists $dont_propose_tests{$test};
+                       my $file_proposed_tests = 
get_file_proposed_tests($realfile);
+                       foreach my $test (keys %$file_proposed_tests) {
+                               my $strength = $file_proposed_tests->{$test};
+                               next if $strength <= 
($dont_propose_tests{$test} // -1);
                                my $name;
                                my $title;
                                my $command;
@@ -3000,19 +3020,19 @@ sub process {
                                        $command = $test;
                                }
                                if ($command) {
-                                       $message = "Execute the $title " .
-                                               "proposed for verifying changes 
to $realfile:\n" .
-                                               "$command\n";
+                                       $message = "Execute the $title 
$test_proposal_strengths[$strength] " .
+                                               "for verifying changes to 
$realfile:\n$command\n";
                                } else {
-                                       $message = "The $title is proposed for 
verifying changes to $realfile\n";
+                                       $message = "The $title is 
$test_proposal_strengths[$strength] " .
+                                               "for verifying changes to 
$realfile\n";
                                }
                                if ($name) {
                                        $message .= "See instructions under 
\"$name\" in $testsrelfile\n";
                                }
                                $message .= "Add the following to the tested 
commit's message, " .
                                        "IF IT PASSES:\nTested-with: $test\n";
-                               CHK("TEST_PROPOSAL", $message);
-                               $dont_propose_tests{$test} = 1;
+                               (\&CHK, \&WARN, 
\&ERROR)[$strength]("TEST_PROPOSAL", $message);
+                               $dont_propose_tests{$test} = $strength;
                        }
 
                        next;
@@ -3350,7 +3370,7 @@ sub process {
                                # the test and its subsets
                                local *dont_propose_test_name = sub {
                                        my ($name) = @_;
-                                       $dont_propose_tests{"*" . $name} = 1;
+                                       $dont_propose_tests{"*" . $name} = 2;
                                        foreach my $sub_name (keys %tests) {
                                                my $sub_data = 
$tests{$sub_name};
                                                my $superset = 
$sub_data->{"superset"};
@@ -3363,7 +3383,7 @@ sub process {
                        # Else it's a command
                        } else {
                                # Do not propose the test
-                               $dont_propose_tests{$test} = 1;
+                               $dont_propose_tests{$test} = 2;
                        }
                }
 
@@ -3821,9 +3841,10 @@ sub process {
                        if ($rawline =~ /^\+V:\s*(.*)/) {
                                my $entry = $1;
                                # If this is a valid entry value
-                               if ($entry =~ /^[^@#]*$/) {
+                               if ($entry =~ $test_proposal_entry_re) {
+                                       my $test = $2;
                                        # If the test in the entry is a 
reference
-                                       if ($entry =~ /^\*\s*(.*)$/) {
+                                       if ($test =~ /^\*\s*(.*)$/) {
                                                my $name = $1;
                                                ERROR("TEST_PROPOSAL_INVALID",
                                                      "Test $name referenced in 
MAINTAINERS not found in $testsrelfile\n" .
@@ -3831,7 +3852,7 @@ sub process {
                                        }
                                } else {
                                        ERROR("TEST_PROPOSAL_INVALID",
-                                             "Test proposal cannot contain 
'\@' or '#' characters\n" . $herecurr);
+                                             "Invalid test proposal entry: 
$entry\n" . $herecurr);
                                }
                        }
                }
-- 
2.42.0


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