[PATCH 0/9] get_abi.pl: Check for missing symbols at the ABI specs

[PATCH 0/9] get_abi.pl: Check for missing symbols at the ABI specs

[Mauro Carvalho Chehab]

Hi Greg,

Sometime ago, I discussed with Jonathan Cameron about providing 
a way check that the ABI documentation is incomplete.

While it would be doable to validate the ABI by searching __ATTR and 
similar macros around the driver, this would probably be very complex
and would take a while to parse.

So, I ended by implementing a new feature at scripts/get_abi.pl
which does a check on the sysfs contents of a running system:
it reads everything under /sys and reads the entire ABI from
Documentation/ABI. It then warns for symbols that weren't found,
optionally showing possible candidates that might be misdefined.

I opted to place it on 3 patches:

The first patch adds the basic logic. It runs really quicky (up to 2
seconds), but it doesn't use sysfs softlinks.

Patch 2 adds support for also parsing softlinks. It slows the logic,
with now takes ~40 seconds to run on my desktop (and ~23
seconds on a HiKey970 ARM board). There are space there for
performance improvements, by using a more sophisticated
algorithm, at the expense of making the code harder to
understand. I ended opting to use a simple implementation
for now, as ~40 seconds sounds acceptable on my eyes.

Patch 3 adds an optional parameter to allow filtering the results
using a regex given by the user.

One of the problems with the current ABI definitions is that several
symbols define wildcards, on non-standard ways. The more commonly
wildcards used there are:

	<foo>
	{foo}
	[foo]
	X
	Y
	Z
	/.../

The script converts the above wildcards into (somewhat relaxed)
regexes.

There's one place using  "(some description)". This one is harder to
parse, as parenthesis are used by the parsing regexes. As this happens
only on one file, patch 4 addresses such case.

Patch 5 to 9 fix some other ABI troubles I identified.

In long term, perhaps the better would be to just use regex on What:
fields, as this would avoid extra heuristics at get_abi.pl, but this is
OOT from this patch, and would mean a large number of changes.

-

As reference, I sent an early implementation of this change as a RFC:
	https://lore.kernel.org/lkml/cover.1624014140.git.mchehab+huawei@kernel.org/

Mauro Carvalho Chehab (9):
  scripts: get_abi.pl: Check for missing symbols at the ABI specs
  scripts: get_abi.pl: detect softlinks
  scripts: get_abi.pl: add an option to filter undefined results
  ABI: sysfs-bus-usb: better document variable argument
  ABI: sysfs-module: better document module name parameter
  ABI: sysfs-tty: better document module name parameter
  ABI: sysfs-kernel-slab: use a wildcard for the cache name
  ABI: security: fix location for evm and ima_policy
  ABI: sysfs-module: document initstate

 Documentation/ABI/stable/sysfs-module       |  10 +-
 Documentation/ABI/testing/evm               |   4 +-
 Documentation/ABI/testing/ima_policy        |   2 +-
 Documentation/ABI/testing/sysfs-bus-usb     |  16 +-
 Documentation/ABI/testing/sysfs-kernel-slab |  94 ++++-----
 Documentation/ABI/testing/sysfs-module      |   7 +
 Documentation/ABI/testing/sysfs-tty         |  32 +--
 scripts/get_abi.pl                          | 218 +++++++++++++++++++-
 8 files changed, 303 insertions(+), 80 deletions(-)

-- 
2.31.1

[PATCH 1/9] scripts: get_abi.pl: Check for missing symbols at the ABI specs

[Mauro Carvalho Chehab]

Check for the symbols that exists under /sys but aren't
defined at Documentation/ABI.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
 scripts/get_abi.pl | 88 ++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 86 insertions(+), 2 deletions(-)

diff --git a/scripts/get_abi.pl b/scripts/get_abi.pl
index d7aa82094296..31b2fdf1f318 100755
--- a/scripts/get_abi.pl
+++ b/scripts/get_abi.pl
@@ -13,7 +13,9 @@ my $help = 0;
 my $man = 0;
 my $debug = 0;
 my $enable_lineno = 0;
+my $show_warnings = 1;
 my $prefix="Documentation/ABI";
+my $sysfs_prefix="/sys";
 
 #
 # If true, assumes that the description is formatted with ReST
@@ -36,7 +38,7 @@ pod2usage(2) if (scalar @ARGV < 1 || @ARGV > 2);
 
 my ($cmd, $arg) = @ARGV;
 
-pod2usage(2) if ($cmd ne "search" && $cmd ne "rest" && $cmd ne "validate");
+pod2usage(2) if ($cmd ne "search" && $cmd ne "rest" && $cmd ne "validate" && $cmd ne "undefined");
 pod2usage(2) if ($cmd eq "search" && !$arg);
 
 require Data::Dumper if ($debug);
@@ -50,6 +52,8 @@ my %symbols;
 sub parse_error($$$$) {
 	my ($file, $ln, $msg, $data) = @_;
 
+	return if (!$show_warnings);
+
 	$data =~ s/\s+$/\n/;
 
 	print STDERR "Warning: file $file#$ln:\n\t$msg";
@@ -521,11 +525,86 @@ sub search_symbols {
 	}
 }
 
+# Exclude /sys/kernel/debug and /sys/kernel/tracing from the search path
+sub skip_debugfs {
+	if (($File::Find::dir =~ m,^/sys/kernel,)) {
+		return grep {!/(debug|tracing)/ } @_;
+	}
+
+	if (($File::Find::dir =~ m,^/sys/fs,)) {
+		return grep {!/(pstore|bpf|fuse)/ } @_;
+	}
+
+	return @_
+}
+
+my %leaf;
+
+my $escape_symbols = qr { ([\x01-\x08\x0e-\x1f\x21-\x29\x2b-\x2d\x3a-\x40\x7b-\xff]) }x;
+sub parse_existing_sysfs {
+	my $file = $File::Find::name;
+
+	my $mode = (stat($file))[2];
+	return if ($mode & S_IFDIR);
+
+	my $leave = $file;
+	$leave =~ s,.*/,,;
+
+	if (defined($leaf{$leave})) {
+		# FIXME: need to check if the path makes sense
+		my $what = $leaf{$leave};
+
+		$what =~ s/,/ /g;
+
+		$what =~ s/\<[^\>]+\>/.*/g;
+		$what =~ s/\{[^\}]+\}/.*/g;
+		$what =~ s/\[[^\]]+\]/.*/g;
+		$what =~ s,/\.\.\./,/.*/,g;
+		$what =~ s,/\*/,/.*/,g;
+
+		$what =~ s/\s+/ /g;
+
+		# Escape all other symbols
+		$what =~ s/$escape_symbols/\\$1/g;
+
+		foreach my $i (split / /,$what) {
+			if ($file =~ m#^$i$#) {
+#				print "$file: $i: OK!\n";
+				return;
+			}
+		}
+
+		print "$file: $leave is defined at $what\n";
+
+		return;
+	}
+
+	print "$file not found.\n";
+}
+
+sub undefined_symbols {
+	foreach my $what (sort keys %data) {
+		my $leave = $what;
+		$leave =~ s,.*/,,;
+
+		if (defined($leaf{$leave})) {
+			$leaf{$leave} .= " " . $what;
+		} else {
+			$leaf{$leave} = $what;
+		}
+	}
+
+	find({wanted =>\&parse_existing_sysfs, preprocess =>\&skip_debugfs, no_chdir => 1}, $sysfs_prefix);
+}
+
 # Ensure that the prefix will always end with a slash
 # While this is not needed for find, it makes the patch nicer
 # with --enable-lineno
 $prefix =~ s,/?$,/,;
 
+if ($cmd eq "undefined" || $cmd eq "search") {
+	$show_warnings = 0;
+}
 #
 # Parses all ABI files located at $prefix dir
 #
@@ -536,7 +615,9 @@ print STDERR Data::Dumper->Dump([\%data], [qw(*data)]) if ($debug);
 #
 # Handles the command
 #
-if ($cmd eq "search") {
+if ($cmd eq "undefined") {
+	undefined_symbols;
+} elsif ($cmd eq "search") {
 	search_symbols;
 } else {
 	if ($cmd eq "rest") {
@@ -575,6 +656,9 @@ B<rest>                  - output the ABI in ReST markup language
 
 B<validate>              - validate the ABI contents
 
+B<undefined>             - existing symbols at the system that aren't
+                           defined at Documentation/ABI
+
 =back
 
 =head1 OPTIONS
-- 
2.31.1

[PATCH 2/9] scripts: get_abi.pl: detect softlinks

[Mauro Carvalho Chehab]

The way sysfs works is that the same leave may be present under
/sys/devices, /sys/bus and /sys/class, etc, linked via soft
symlinks.

To make it harder to parse, the ABI definition usually refers
only to one of those locations.

So, improve the logic in order to retrieve the symlinks.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
 scripts/get_abi.pl | 177 ++++++++++++++++++++++++++++++++++++---------
 1 file changed, 143 insertions(+), 34 deletions(-)

diff --git a/scripts/get_abi.pl b/scripts/get_abi.pl
index 31b2fdf1f318..7600e50b53bb 100755
--- a/scripts/get_abi.pl
+++ b/scripts/get_abi.pl
@@ -8,8 +8,10 @@ use Pod::Usage;
 use Getopt::Long;
 use File::Find;
 use Fcntl ':mode';
+use Cwd 'abs_path';
 
 my $help = 0;
+my $hint = 0;
 my $man = 0;
 my $debug = 0;
 my $enable_lineno = 0;
@@ -28,6 +30,7 @@ GetOptions(
 	"rst-source!" => \$description_is_rst,
 	"dir=s" => \$prefix,
 	'help|?' => \$help,
+	"show-hints" => \$hint,
 	man => \$man
 ) or pod2usage(2);
 
@@ -526,7 +529,7 @@ sub search_symbols {
 }
 
 # Exclude /sys/kernel/debug and /sys/kernel/tracing from the search path
-sub skip_debugfs {
+sub dont_parse_special_attributes {
 	if (($File::Find::dir =~ m,^/sys/kernel,)) {
 		return grep {!/(debug|tracing)/ } @_;
 	}
@@ -539,62 +542,162 @@ sub skip_debugfs {
 }
 
 my %leaf;
+my %aliases;
+my @files;
 
 my $escape_symbols = qr { ([\x01-\x08\x0e-\x1f\x21-\x29\x2b-\x2d\x3a-\x40\x7b-\xff]) }x;
 sub parse_existing_sysfs {
 	my $file = $File::Find::name;
+	my $mode = (lstat($file))[2];
+	my $abs_file = abs_path($file);
 
-	my $mode = (stat($file))[2];
-	return if ($mode & S_IFDIR);
+	if (S_ISLNK($mode)) {
+		$aliases{$file} = $abs_file;
+		return;
+	}
 
-	my $leave = $file;
-	$leave =~ s,.*/,,;
+	return if (S_ISDIR($mode));
 
-	if (defined($leaf{$leave})) {
-		# FIXME: need to check if the path makes sense
-		my $what = $leaf{$leave};
+	# Trivial: file is defined exactly the same way at ABI What:
+	return if (defined($data{$file}));
+	return if (defined($data{$abs_file}));
+
+	push @files, $abs_file;
+}
+
+sub check_undefined_symbols {
+	foreach my $file (sort @files) {
+
+		# sysfs-module is special, as its definitions are inside
+		# a text. For now, just ignore them.
+		next if ($file =~ m#^/sys/module/#);
+
+		# Ignore cgroup and firmware
+		next if ($file =~ m#^/sys/(fs/cgroup|firmware)/#);
+
+		my $defined = 0;
+		my $exact = 0;
+		my $whats = "";
+
+		my $leave = $file;
+		$leave =~ s,.*/,,;
+
+		my $path = $file;
+		$path =~ s,(.*/).*,$1,;
+
+		if (defined($leaf{$leave})) {
+			my $what = $leaf{$leave};
+			$whats .= " $what" if (!($whats =~ m/$what/));
+
+			foreach my $w (split / /, $what) {
+				if ($file =~ m#^$w$#) {
+					$exact = 1;
+					last;
+				}
+			}
+			# Check for aliases
+			#
+			# TODO: this algorithm is O(w * n²). It can be
+			# improved in the future in order to handle it
+			# faster, by changing parse_existing_sysfs to
+			# store the sysfs inside a tree, at the expense
+			# on making the code less readable and/or using some
+			# additional perl library.
+			foreach my $a (keys %aliases) {
+				my $new = $aliases{$a};
+				my $len = length($new);
+
+				if (substr($file, 0, $len) eq $new) {
+					my $newf = $a . substr($file, $len);
+
+					foreach my $w (split / /, $what) {
+						if ($newf =~ m#^$w$#) {
+							$exact = 1;
+							last;
+						}
+					}
+				}
+			}
+
+			$defined++;
+		}
+		next if ($exact);
+
+		# Ignore some sysfs nodes
+		next if ($file =~ m#/(sections|notes)/#);
+
+		# Would need to check at
+		# Documentation/admin-guide/kernel-parameters.txt, but this
+		# is not easily parseable.
+		next if ($file =~ m#/parameters/#);
+
+		if ($hint && $defined) {
+			print "$leave at $path might be one of:$whats\n";
+			next;
+		}
+		print "$file not found.\n";
+	}
+}
+
+sub undefined_symbols {
+	find({
+		wanted =>\&parse_existing_sysfs,
+		preprocess =>\&dont_parse_special_attributes,
+		no_chdir => 1
+	     }, $sysfs_prefix);
+
+	foreach my $what (sort keys %data) {
+		next if (!($what =~ m/^$sysfs_prefix/));
+
+		# Convert what into regular expressions
 
 		$what =~ s/,/ /g;
 
+		$what =~ s,/\.\.\./,/.*/,g;
+
+		# Temporarely change [0-9] type of patterns
+		$what =~ s/\[(\d+)\-(\d+)\]/\xf4$1-$2\xf5/g;
+
+		# Handle multiple option patterns
+		$what =~ s/[\{\<\[]([\w_]+)(?:[,|\s]+([\w_]+)){1,}[\}\>\]]/($1|$2)/g;
+
+		# Handle wildcards
 		$what =~ s/\<[^\>]+\>/.*/g;
 		$what =~ s/\{[^\}]+\}/.*/g;
 		$what =~ s/\[[^\]]+\]/.*/g;
-		$what =~ s,/\.\.\./,/.*/,g;
+
+		$what =~ s/[XYZ]/.*/g;
 		$what =~ s,/\*/,/.*/,g;
 
+		# Recover [0-9] type of patterns
+		$what =~ s/\xf4/[/g;
+		$what =~ s/\xf5/]/g;
+
+		# Remove duplicated spaces
 		$what =~ s/\s+/ /g;
 
+		my $leave = $what;
+		$leave =~ s,.*/,,;
+
+		next if ($leave =~ m/^\.\*/ || $leave eq "");
+
 		# Escape all other symbols
 		$what =~ s/$escape_symbols/\\$1/g;
+		$what =~ s/\\([\[\]\(\)\|])/$1/g;
+		$what =~ s/(\d+)\\(-\d+)/$1$2/g;
 
-		foreach my $i (split / /,$what) {
-			if ($file =~ m#^$i$#) {
-#				print "$file: $i: OK!\n";
-				return;
+		$leave =~ s/[\(\)]//g;
+
+		foreach my $l (split /\|/, $leave) {
+			if (defined($leaf{$l})) {
+				$leaf{$l} .= " " . $what;
+			} else {
+				$leaf{$l} = $what;
 			}
 		}
-
-		print "$file: $leave is defined at $what\n";
-
-		return;
-	}
-
-	print "$file not found.\n";
-}
-
-sub undefined_symbols {
-	foreach my $what (sort keys %data) {
-		my $leave = $what;
-		$leave =~ s,.*/,,;
-
-		if (defined($leaf{$leave})) {
-			$leaf{$leave} .= " " . $what;
-		} else {
-			$leaf{$leave} = $what;
-		}
 	}
 
-	find({wanted =>\&parse_existing_sysfs, preprocess =>\&skip_debugfs, no_chdir => 1}, $sysfs_prefix);
+	check_undefined_symbols;
 }
 
 # Ensure that the prefix will always end with a slash
@@ -644,7 +747,8 @@ abi_book.pl - parse the Linux ABI files and produce a ReST book.
 =head1 SYNOPSIS
 
 B<abi_book.pl> [--debug] [--enable-lineno] [--man] [--help]
-	       [--(no-)rst-source] [--dir=<dir>] <COMAND> [<ARGUMENT>]
+	       [--(no-)rst-source] [--dir=<dir>] [--show-hints]
+	       <COMAND> [<ARGUMENT>]
 
 Where <COMMAND> can be:
 
@@ -686,6 +790,11 @@ Enable output of #define LINENO lines.
 Put the script in verbose mode, useful for debugging. Can be called multiple
 times, to increase verbosity.
 
+=item B<--show-hints>
+
+Show hints about possible definitions for the missing ABI symbols.
+Used only when B<undefined>.
+
 =item B<--help>
 
 Prints a brief help message and exits.
-- 
2.31.1

[PATCH 3/9] scripts: get_abi.pl: add an option to filter undefined results

[Mauro Carvalho Chehab]

The output of this script can be too big. Add an option to
filter out results, in order to help finding issues at the
ABI files.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
 scripts/get_abi.pl | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/scripts/get_abi.pl b/scripts/get_abi.pl
index 7600e50b53bb..9ca43b225d9a 100755
--- a/scripts/get_abi.pl
+++ b/scripts/get_abi.pl
@@ -18,6 +18,7 @@ my $enable_lineno = 0;
 my $show_warnings = 1;
 my $prefix="Documentation/ABI";
 my $sysfs_prefix="/sys";
+my $search_string;
 
 #
 # If true, assumes that the description is formatted with ReST
@@ -31,6 +32,7 @@ GetOptions(
 	"dir=s" => \$prefix,
 	'help|?' => \$help,
 	"show-hints" => \$hint,
+	"search-string=s" => \$search_string,
 	man => \$man
 ) or pod2usage(2);
 
@@ -578,6 +580,7 @@ sub check_undefined_symbols {
 		my $defined = 0;
 		my $exact = 0;
 		my $whats = "";
+		my $found_string;
 
 		my $leave = $file;
 		$leave =~ s,.*/,,;
@@ -585,6 +588,11 @@ sub check_undefined_symbols {
 		my $path = $file;
 		$path =~ s,(.*/).*,$1,;
 
+		if ($search_string) {
+			$found_string = 1 if ($file =~ m#$search_string#);
+		}
+
+		print "--> $file\n" if ($found_string && $hint);
 		if (defined($leaf{$leave})) {
 			my $what = $leaf{$leave};
 			$whats .= " $what" if (!($whats =~ m/$what/));
@@ -610,6 +618,7 @@ sub check_undefined_symbols {
 				if (substr($file, 0, $len) eq $new) {
 					my $newf = $a . substr($file, $len);
 
+					print "    $newf\n" if ($found_string && $hint);
 					foreach my $w (split / /, $what) {
 						if ($newf =~ m#^$w$#) {
 							$exact = 1;
@@ -632,10 +641,10 @@ sub check_undefined_symbols {
 		next if ($file =~ m#/parameters/#);
 
 		if ($hint && $defined) {
-			print "$leave at $path might be one of:$whats\n";
+			print "$leave at $path might be one of:$whats\n"  if (!$search_string || $found_string);
 			next;
 		}
-		print "$file not found.\n";
+		print "$file not found.\n" if (!$search_string || $found_string);
 	}
 }
 
@@ -686,6 +695,10 @@ sub undefined_symbols {
 		$what =~ s/\\([\[\]\(\)\|])/$1/g;
 		$what =~ s/(\d+)\\(-\d+)/$1$2/g;
 
+		if ($search_string) {
+			print "What: $what\n" if ($what =~ m#$search_string#);
+		}
+
 		$leave =~ s/[\(\)]//g;
 
 		foreach my $l (split /\|/, $leave) {
@@ -748,6 +761,7 @@ abi_book.pl - parse the Linux ABI files and produce a ReST book.
 
 B<abi_book.pl> [--debug] [--enable-lineno] [--man] [--help]
 	       [--(no-)rst-source] [--dir=<dir>] [--show-hints]
+	       [--search-string <regex>]
 	       <COMAND> [<ARGUMENT>]
 
 Where <COMMAND> can be:
@@ -795,6 +809,11 @@ times, to increase verbosity.
 Show hints about possible definitions for the missing ABI symbols.
 Used only when B<undefined>.
 
+=item B<--search-string> [regex string]
+
+Show only occurences that match a search string.
+Used only when B<undefined>.
+
 =item B<--help>
 
 Prints a brief help message and exits.
-- 
2.31.1

[PATCH 4/9] ABI: sysfs-bus-usb: better document variable argument

[Mauro Carvalho Chehab]

On almost all ABI documents, variable arguments are declared
as <foo_bar>. Change it here too, in order to allow replacing
such wildcards by regexes on a scriptable way.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
 Documentation/ABI/testing/sysfs-bus-usb | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/Documentation/ABI/testing/sysfs-bus-usb b/Documentation/ABI/testing/sysfs-bus-usb
index 73eb23bc1f34..42103f0f54d6 100644
--- a/Documentation/ABI/testing/sysfs-bus-usb
+++ b/Documentation/ABI/testing/sysfs-bus-usb
@@ -166,14 +166,14 @@ Description:
 		The file will be present for all speeds of USB devices, and will
 		always read "no" for USB 1.1 and USB 2.0 devices.
 
-What:		/sys/bus/usb/devices/.../(hub interface)/portX
+What:		/sys/bus/usb/devices/.../<hub_interface>/port<X>
 Date:		August 2012
 Contact:	Lan Tianyu <tianyu.lan@intel.com>
 Description:
-		The /sys/bus/usb/devices/.../(hub interface)/portX
+		The /sys/bus/usb/devices/.../<hub_interface>/port<X>
 		is usb port device's sysfs directory.
 
-What:		/sys/bus/usb/devices/.../(hub interface)/portX/connect_type
+What:		/sys/bus/usb/devices/.../<hub_interface>/port<X>/connect_type
 Date:		January 2013
 Contact:	Lan Tianyu <tianyu.lan@intel.com>
 Description:
@@ -182,7 +182,7 @@ Description:
 		The file will read "hotplug", "hardwired" and "not used" if the
 		information is available, and "unknown" otherwise.
 
-What:		/sys/bus/usb/devices/.../(hub interface)/portX/location
+What:		/sys/bus/usb/devices/.../<hub_interface>/port<X>/location
 Date:		October 2018
 Contact:	Bjørn Mork <bjorn@mork.no>
 Description:
@@ -192,7 +192,7 @@ Description:
 		raw location value as a hex integer.
 
 
-What:		/sys/bus/usb/devices/.../(hub interface)/portX/quirks
+What:		/sys/bus/usb/devices/.../<hub_interface>/port<X>/quirks
 Date:		May 2018
 Contact:	Nicolas Boichat <drinkcat@chromium.org>
 Description:
@@ -216,7 +216,7 @@ Description:
 		   used to help make enumeration work better on some high speed
 		   devices.
 
-What:		/sys/bus/usb/devices/.../(hub interface)/portX/over_current_count
+What:		/sys/bus/usb/devices/.../<hub_interface>/port<X>/over_current_count
 Date:		February 2018
 Contact:	Richard Leitner <richard.leitner@skidata.com>
 Description:
@@ -230,10 +230,10 @@ Description:
 		Any time this value changes the corresponding hub device will send a
 		udev event with the following attributes::
 
-		  OVER_CURRENT_PORT=/sys/bus/usb/devices/.../(hub interface)/portX
+		  OVER_CURRENT_PORT=/sys/bus/usb/devices/.../<hub_interface>/port<X>
 		  OVER_CURRENT_COUNT=[current value of this sysfs attribute]
 
-What:		/sys/bus/usb/devices/.../(hub interface)/portX/usb3_lpm_permit
+What:		/sys/bus/usb/devices/.../<hub_interface>/port<X>/usb3_lpm_permit
 Date:		November 2015
 Contact:	Lu Baolu <baolu.lu@linux.intel.com>
 Description:
-- 
2.31.1

[PATCH 5/9] ABI: sysfs-module: better document module name parameter

[Mauro Carvalho Chehab]

On almost all ABI documents, variable arguments are declared
as <foo_bar>. Change it here too, in order to allow replacing
such wildcards by regexes on a scriptable way.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
 Documentation/ABI/stable/sysfs-module | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/Documentation/ABI/stable/sysfs-module b/Documentation/ABI/stable/sysfs-module
index 6272ae5fb366..c60c7a6f5aff 100644
--- a/Documentation/ABI/stable/sysfs-module
+++ b/Documentation/ABI/stable/sysfs-module
@@ -2,7 +2,7 @@ What:		/sys/module
 Description:
 	The /sys/module tree consists of the following structure:
 
-	/sys/module/MODULENAME
+	/sys/module/<MODULENAME>
 		The name of the module that is in the kernel.  This
 		module name will always show up if the module is loaded as a
 		dynamic module.  If it is built directly into the kernel, it
@@ -12,7 +12,7 @@ Description:
 		Note: The conditions of creation in the built-in case are not
 		by design and may be removed in the future.
 
-	/sys/module/MODULENAME/parameters
+	/sys/module/<MODULENAME>/parameters
 		This directory contains individual files that are each
 		individual parameters of the module that are able to be
 		changed at runtime.  See the individual module
@@ -25,10 +25,14 @@ Description:
 		individual driver documentation for details as to the
 		stability of the different parameters.
 
-	/sys/module/MODULENAME/refcnt
+	/sys/module/<MODULENAME>/refcnt
 		If the module is able to be unloaded from the kernel, this file
 		will contain the current reference count of the module.
 
 		Note: If the module is built into the kernel, or if the
 		CONFIG_MODULE_UNLOAD kernel configuration value is not enabled,
 		this file will not be present.
+
+	/sys/module/<MODULENAME>/srcversion
+		If the module source has MODULE_VERSION, this file will contain
+		the version of the source code.
-- 
2.31.1

[PATCH 6/9] ABI: sysfs-tty: better document module name parameter

[Mauro Carvalho Chehab]

On almost all ABI documents, variable arguments are declared
as <foo_bar>. Change it here too, in order to allow replacing
such wildcards by regexes on a scriptable way.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
 Documentation/ABI/testing/sysfs-tty | 32 ++++++++++++++---------------
 1 file changed, 16 insertions(+), 16 deletions(-)

diff --git a/Documentation/ABI/testing/sysfs-tty b/Documentation/ABI/testing/sysfs-tty
index e157130a6792..820e412d38a8 100644
--- a/Documentation/ABI/testing/sysfs-tty
+++ b/Documentation/ABI/testing/sysfs-tty
@@ -9,7 +9,7 @@ Description:
 		 The file supports poll() to detect virtual
 		 console switches.
 
-What:		/sys/class/tty/tty0/active
+What:		/sys/class/tty/tty<x>/active
 Date:		Nov 2010
 Contact:	Kay Sievers <kay.sievers@vrfy.org>
 Description:
@@ -18,7 +18,7 @@ Description:
 		 The file supports poll() to detect virtual
 		 console switches.
 
-What:		/sys/class/tty/ttyS0/uartclk
+What:		/sys/class/tty/ttyS<x>/uartclk
 Date:		Sep 2012
 Contact:	Tomas Hlavacek <tmshlvck@gmail.com>
 Description:
@@ -29,7 +29,7 @@ Description:
 		 These sysfs values expose the TIOCGSERIAL interface via
 		 sysfs rather than via ioctls.
 
-What:		/sys/class/tty/ttyS0/type
+What:		/sys/class/tty/ttyS<x>/type
 Date:		October 2012
 Contact:	Alan Cox <alan@linux.intel.com>
 Description:
@@ -38,7 +38,7 @@ Description:
 		 These sysfs values expose the TIOCGSERIAL interface via
 		 sysfs rather than via ioctls.
 
-What:		/sys/class/tty/ttyS0/line
+What:		/sys/class/tty/ttyS<x>/line
 Date:		October 2012
 Contact:	Alan Cox <alan@linux.intel.com>
 Description:
@@ -47,7 +47,7 @@ Description:
 		 These sysfs values expose the TIOCGSERIAL interface via
 		 sysfs rather than via ioctls.
 
-What:		/sys/class/tty/ttyS0/port
+What:		/sys/class/tty/ttyS<x>/port
 Date:		October 2012
 Contact:	Alan Cox <alan@linux.intel.com>
 Description:
@@ -56,7 +56,7 @@ Description:
 		 These sysfs values expose the TIOCGSERIAL interface via
 		 sysfs rather than via ioctls.
 
-What:		/sys/class/tty/ttyS0/irq
+What:		/sys/class/tty/ttyS<x>/irq
 Date:		October 2012
 Contact:	Alan Cox <alan@linux.intel.com>
 Description:
@@ -65,7 +65,7 @@ Description:
 		 These sysfs values expose the TIOCGSERIAL interface via
 		 sysfs rather than via ioctls.
 
-What:		/sys/class/tty/ttyS0/flags
+What:		/sys/class/tty/ttyS<x>/flags
 Date:		October 2012
 Contact:	Alan Cox <alan@linux.intel.com>
 Description:
@@ -74,7 +74,7 @@ Description:
 		 These sysfs values expose the TIOCGSERIAL interface via
 		 sysfs rather than via ioctls.
 
-What:		/sys/class/tty/ttyS0/xmit_fifo_size
+What:		/sys/class/tty/ttyS<x>/xmit_fifo_size
 Date:		October 2012
 Contact:	Alan Cox <alan@linux.intel.com>
 Description:
@@ -83,7 +83,7 @@ Description:
 		 These sysfs values expose the TIOCGSERIAL interface via
 		 sysfs rather than via ioctls.
 
-What:		/sys/class/tty/ttyS0/close_delay
+What:		/sys/class/tty/ttyS<x>/close_delay
 Date:		October 2012
 Contact:	Alan Cox <alan@linux.intel.com>
 Description:
@@ -92,7 +92,7 @@ Description:
 		 These sysfs values expose the TIOCGSERIAL interface via
 		 sysfs rather than via ioctls.
 
-What:		/sys/class/tty/ttyS0/closing_wait
+What:		/sys/class/tty/ttyS<x>/closing_wait
 Date:		October 2012
 Contact:	Alan Cox <alan@linux.intel.com>
 Description:
@@ -101,7 +101,7 @@ Description:
 		 These sysfs values expose the TIOCGSERIAL interface via
 		 sysfs rather than via ioctls.
 
-What:		/sys/class/tty/ttyS0/custom_divisor
+What:		/sys/class/tty/ttyS<x>/custom_divisor
 Date:		October 2012
 Contact:	Alan Cox <alan@linux.intel.com>
 Description:
@@ -110,7 +110,7 @@ Description:
 		 These sysfs values expose the TIOCGSERIAL interface via
 		 sysfs rather than via ioctls.
 
-What:		/sys/class/tty/ttyS0/io_type
+What:		/sys/class/tty/ttyS<x>/io_type
 Date:		October 2012
 Contact:	Alan Cox <alan@linux.intel.com>
 Description:
@@ -120,7 +120,7 @@ Description:
 		 These sysfs values expose the TIOCGSERIAL interface via
 		 sysfs rather than via ioctls.
 
-What:		/sys/class/tty/ttyS0/iomem_base
+What:		/sys/class/tty/ttyS<x>/iomem_base
 Date:		October 2012
 Contact:	Alan Cox <alan@linux.intel.com>
 Description:
@@ -129,7 +129,7 @@ Description:
 		 These sysfs values expose the TIOCGSERIAL interface via
 		 sysfs rather than via ioctls.
 
-What:		/sys/class/tty/ttyS0/iomem_reg_shift
+What:		/sys/class/tty/ttyS<x>/iomem_reg_shift
 Date:		October 2012
 Contact:	Alan Cox <alan@linux.intel.com>
 Description:
@@ -139,7 +139,7 @@ Description:
 		 These sysfs values expose the TIOCGSERIAL interface via
 		 sysfs rather than via ioctls.
 
-What:		/sys/class/tty/ttyS0/rx_trig_bytes
+What:		/sys/class/tty/ttyS<x>/rx_trig_bytes
 Date:		May 2014
 Contact:	Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@hitachi.com>
 Description:
@@ -155,7 +155,7 @@ Description:
 		 16550A, which has 1/4/8/14 bytes trigger, the RX trigger is
 		 automatically changed to 4 bytes.
 
-What:		/sys/class/tty/ttyS0/console
+What:		/sys/class/tty/ttyS<x>/console
 Date:		February 2020
 Contact:	Andy Shevchenko <andriy.shevchenko@linux.intel.com>
 Description:
-- 
2.31.1

[PATCH 7/9] ABI: sysfs-kernel-slab: use a wildcard for the cache name

[Mauro Carvalho Chehab]

the "cache" part of the description is actually a wildcard,
as, in practice, this will use per-subsystem names:

    /sys/kernel/slab/Acpi-Namespace/align
    /sys/kernel/slab/Acpi-Operand/align
    /sys/kernel/slab/Acpi-Parse/align
...
    /sys/kernel/slab/zswap_entry/align

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
 Documentation/ABI/testing/sysfs-kernel-slab | 94 ++++++++++-----------
 1 file changed, 47 insertions(+), 47 deletions(-)

diff --git a/Documentation/ABI/testing/sysfs-kernel-slab b/Documentation/ABI/testing/sysfs-kernel-slab
index c9f12baf8baa..77e5840b00a5 100644
--- a/Documentation/ABI/testing/sysfs-kernel-slab
+++ b/Documentation/ABI/testing/sysfs-kernel-slab
@@ -10,7 +10,7 @@ Description:
 		any cache it aliases, if any).
 Users:		kernel memory tuning tools
 
-What:		/sys/kernel/slab/cache/aliases
+What:		/sys/kernel/slab/<cache>/aliases
 Date:		May 2007
 KernelVersion:	2.6.22
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -19,7 +19,7 @@ Description:
 		The aliases file is read-only and specifies how many caches
 		have merged into this cache.
 
-What:		/sys/kernel/slab/cache/align
+What:		/sys/kernel/slab/<cache>/align
 Date:		May 2007
 KernelVersion:	2.6.22
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -28,7 +28,7 @@ Description:
 		The align file is read-only and specifies the cache's object
 		alignment in bytes.
 
-What:		/sys/kernel/slab/cache/alloc_calls
+What:		/sys/kernel/slab/<cache>/alloc_calls
 Date:		May 2007
 KernelVersion:	2.6.22
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -39,7 +39,7 @@ Description:
 		The alloc_calls file only contains information if debugging is
 		enabled for that cache (see Documentation/vm/slub.rst).
 
-What:		/sys/kernel/slab/cache/alloc_fastpath
+What:		/sys/kernel/slab/<cache>/alloc_fastpath
 Date:		February 2008
 KernelVersion:	2.6.25
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -50,7 +50,7 @@ Description:
 		current count.
 		Available when CONFIG_SLUB_STATS is enabled.
 
-What:		/sys/kernel/slab/cache/alloc_from_partial
+What:		/sys/kernel/slab/<cache>/alloc_from_partial
 Date:		February 2008
 KernelVersion:	2.6.25
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -62,7 +62,7 @@ Description:
 		count.
 		Available when CONFIG_SLUB_STATS is enabled.
 
-What:		/sys/kernel/slab/cache/alloc_refill
+What:		/sys/kernel/slab/<cache>/alloc_refill
 Date:		February 2008
 KernelVersion:	2.6.25
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -73,7 +73,7 @@ Description:
 		remote cpu frees.  It can be written to clear the current count.
 		Available when CONFIG_SLUB_STATS is enabled.
 
-What:		/sys/kernel/slab/cache/alloc_slab
+What:		/sys/kernel/slab/<cache>/alloc_slab
 Date:		February 2008
 KernelVersion:	2.6.25
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -84,7 +84,7 @@ Description:
 		clear the current count.
 		Available when CONFIG_SLUB_STATS is enabled.
 
-What:		/sys/kernel/slab/cache/alloc_slowpath
+What:		/sys/kernel/slab/<cache>/alloc_slowpath
 Date:		February 2008
 KernelVersion:	2.6.25
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -96,7 +96,7 @@ Description:
 		clear the current count.
 		Available when CONFIG_SLUB_STATS is enabled.
 
-What:		/sys/kernel/slab/cache/cache_dma
+What:		/sys/kernel/slab/<cache>/cache_dma
 Date:		May 2007
 KernelVersion:	2.6.22
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -106,7 +106,7 @@ Description:
 		are from ZONE_DMA.
 		Available when CONFIG_ZONE_DMA is enabled.
 
-What:		/sys/kernel/slab/cache/cpu_slabs
+What:		/sys/kernel/slab/<cache>/cpu_slabs
 Date:		May 2007
 KernelVersion:	2.6.22
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -115,7 +115,7 @@ Description:
 		The cpu_slabs file is read-only and displays how many cpu slabs
 		are active and their NUMA locality.
 
-What:		/sys/kernel/slab/cache/cpuslab_flush
+What:		/sys/kernel/slab/<cache>/cpuslab_flush
 Date:		April 2009
 KernelVersion:	2.6.31
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -128,7 +128,7 @@ Description:
 		current count.
 		Available when CONFIG_SLUB_STATS is enabled.
 
-What:		/sys/kernel/slab/cache/ctor
+What:		/sys/kernel/slab/<cache>/ctor
 Date:		May 2007
 KernelVersion:	2.6.22
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -138,7 +138,7 @@ Description:
 		constructor function, which is invoked for each object when a
 		new slab is allocated.
 
-What:		/sys/kernel/slab/cache/deactivate_empty
+What:		/sys/kernel/slab/<cache>/deactivate_empty
 Date:		February 2008
 KernelVersion:	2.6.25
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -148,7 +148,7 @@ Description:
 		was deactivated.  It can be written to clear the current count.
 		Available when CONFIG_SLUB_STATS is enabled.
 
-What:		/sys/kernel/slab/cache/deactivate_full
+What:		/sys/kernel/slab/<cache>/deactivate_full
 Date:		February 2008
 KernelVersion:	2.6.25
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -158,7 +158,7 @@ Description:
 		was deactivated.  It can be written to clear the current count.
 		Available when CONFIG_SLUB_STATS is enabled.
 
-What:		/sys/kernel/slab/cache/deactivate_remote_frees
+What:		/sys/kernel/slab/<cache>/deactivate_remote_frees
 Date:		February 2008
 KernelVersion:	2.6.25
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -169,7 +169,7 @@ Description:
 		remotely.  It can be written to clear the current count.
 		Available when CONFIG_SLUB_STATS is enabled.
 
-What:		/sys/kernel/slab/cache/deactivate_to_head
+What:		/sys/kernel/slab/<cache>/deactivate_to_head
 Date:		February 2008
 KernelVersion:	2.6.25
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -180,7 +180,7 @@ Description:
 		list.  It can be written to clear the current count.
 		Available when CONFIG_SLUB_STATS is enabled.
 
-What:		/sys/kernel/slab/cache/deactivate_to_tail
+What:		/sys/kernel/slab/<cache>/deactivate_to_tail
 Date:		February 2008
 KernelVersion:	2.6.25
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -191,7 +191,7 @@ Description:
 		list.  It can be written to clear the current count.
 		Available when CONFIG_SLUB_STATS is enabled.
 
-What:		/sys/kernel/slab/cache/destroy_by_rcu
+What:		/sys/kernel/slab/<cache>/destroy_by_rcu
 Date:		May 2007
 KernelVersion:	2.6.22
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -200,7 +200,7 @@ Description:
 		The destroy_by_rcu file is read-only and specifies whether
 		slabs (not objects) are freed by rcu.
 
-What:		/sys/kernel/slab/cache/free_add_partial
+What:		/sys/kernel/slab/<cache>/free_add_partial
 Date:		February 2008
 KernelVersion:	2.6.25
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -211,7 +211,7 @@ Description:
 		partial list.  It can be written to clear the current count.
 		Available when CONFIG_SLUB_STATS is enabled.
 
-What:		/sys/kernel/slab/cache/free_calls
+What:		/sys/kernel/slab/<cache>/free_calls
 Date:		May 2007
 KernelVersion:	2.6.22
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -221,7 +221,7 @@ Description:
 		object frees if slab debugging is enabled (see
 		Documentation/vm/slub.rst).
 
-What:		/sys/kernel/slab/cache/free_fastpath
+What:		/sys/kernel/slab/<cache>/free_fastpath
 Date:		February 2008
 KernelVersion:	2.6.25
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -232,7 +232,7 @@ Description:
 		It can be written to clear the current count.
 		Available when CONFIG_SLUB_STATS is enabled.
 
-What:		/sys/kernel/slab/cache/free_frozen
+What:		/sys/kernel/slab/<cache>/free_frozen
 Date:		February 2008
 KernelVersion:	2.6.25
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -243,7 +243,7 @@ Description:
 		clear the current count.
 		Available when CONFIG_SLUB_STATS is enabled.
 
-What:		/sys/kernel/slab/cache/free_remove_partial
+What:		/sys/kernel/slab/<cache>/free_remove_partial
 Date:		February 2008
 KernelVersion:	2.6.25
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -255,7 +255,7 @@ Description:
 		count.
 		Available when CONFIG_SLUB_STATS is enabled.
 
-What:		/sys/kernel/slab/cache/free_slab
+What:		/sys/kernel/slab/<cache>/free_slab
 Date:		February 2008
 KernelVersion:	2.6.25
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -266,7 +266,7 @@ Description:
 		the current count.
 		Available when CONFIG_SLUB_STATS is enabled.
 
-What:		/sys/kernel/slab/cache/free_slowpath
+What:		/sys/kernel/slab/<cache>/free_slowpath
 Date:		February 2008
 KernelVersion:	2.6.25
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -277,7 +277,7 @@ Description:
 		be written to clear the current count.
 		Available when CONFIG_SLUB_STATS is enabled.
 
-What:		/sys/kernel/slab/cache/hwcache_align
+What:		/sys/kernel/slab/<cache>/hwcache_align
 Date:		May 2007
 KernelVersion:	2.6.22
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -286,7 +286,7 @@ Description:
 		The hwcache_align file is read-only and specifies whether
 		objects are aligned on cachelines.
 
-What:		/sys/kernel/slab/cache/min_partial
+What:		/sys/kernel/slab/<cache>/min_partial
 Date:		February 2009
 KernelVersion:	2.6.30
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -297,7 +297,7 @@ Description:
 		allocating new slabs.  Such slabs may be reclaimed by utilizing
 		the shrink file.
 
-What:		/sys/kernel/slab/cache/object_size
+What:		/sys/kernel/slab/<cache>/object_size
 Date:		May 2007
 KernelVersion:	2.6.22
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -306,7 +306,7 @@ Description:
 		The object_size file is read-only and specifies the cache's
 		object size.
 
-What:		/sys/kernel/slab/cache/objects
+What:		/sys/kernel/slab/<cache>/objects
 Date:		May 2007
 KernelVersion:	2.6.22
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -315,7 +315,7 @@ Description:
 		The objects file is read-only and displays how many objects are
 		active and from which nodes they are from.
 
-What:		/sys/kernel/slab/cache/objects_partial
+What:		/sys/kernel/slab/<cache>/objects_partial
 Date:		April 2008
 KernelVersion:	2.6.26
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -325,7 +325,7 @@ Description:
 		objects are on partial slabs and from which nodes they are
 		from.
 
-What:		/sys/kernel/slab/cache/objs_per_slab
+What:		/sys/kernel/slab/<cache>/objs_per_slab
 Date:		May 2007
 KernelVersion:	2.6.22
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -333,9 +333,9 @@ Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
 Description:
 		The file objs_per_slab is read-only and specifies how many
 		objects may be allocated from a single slab of the order
-		specified in /sys/kernel/slab/cache/order.
+		specified in /sys/kernel/slab/<cache>/order.
 
-What:		/sys/kernel/slab/cache/order
+What:		/sys/kernel/slab/<cache>/order
 Date:		May 2007
 KernelVersion:	2.6.22
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -352,7 +352,7 @@ Description:
 		order is used and this sysfs entry can not be used to change
 		the order at run time.
 
-What:		/sys/kernel/slab/cache/order_fallback
+What:		/sys/kernel/slab/<cache>/order_fallback
 Date:		April 2008
 KernelVersion:	2.6.26
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -365,7 +365,7 @@ Description:
 
 		Available when CONFIG_SLUB_STATS is enabled.
 
-What:		/sys/kernel/slab/cache/partial
+What:		/sys/kernel/slab/<cache>/partial
 Date:		May 2007
 KernelVersion:	2.6.22
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -374,7 +374,7 @@ Description:
 		The partial file is read-only and displays how long many
 		partial slabs there are and how long each node's list is.
 
-What:		/sys/kernel/slab/cache/poison
+What:		/sys/kernel/slab/<cache>/poison
 Date:		May 2007
 KernelVersion:	2.6.22
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -383,7 +383,7 @@ Description:
 		The poison file specifies whether objects should be poisoned
 		when a new slab is allocated.
 
-What:		/sys/kernel/slab/cache/reclaim_account
+What:		/sys/kernel/slab/<cache>/reclaim_account
 Date:		May 2007
 KernelVersion:	2.6.22
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -392,7 +392,7 @@ Description:
 		The reclaim_account file specifies whether the cache's objects
 		are reclaimable (and grouped by their mobility).
 
-What:		/sys/kernel/slab/cache/red_zone
+What:		/sys/kernel/slab/<cache>/red_zone
 Date:		May 2007
 KernelVersion:	2.6.22
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -401,7 +401,7 @@ Description:
 		The red_zone file specifies whether the cache's objects are red
 		zoned.
 
-What:		/sys/kernel/slab/cache/remote_node_defrag_ratio
+What:		/sys/kernel/slab/<cache>/remote_node_defrag_ratio
 Date:		January 2008
 KernelVersion:	2.6.25
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -415,7 +415,7 @@ Description:
 
 		Available when CONFIG_NUMA is enabled.
 
-What:		/sys/kernel/slab/cache/sanity_checks
+What:		/sys/kernel/slab/<cache>/sanity_checks
 Date:		May 2007
 KernelVersion:	2.6.22
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -426,7 +426,7 @@ Description:
 		checks.  Caches that enable sanity_checks cannot be merged with
 		caches that do not.
 
-What:		/sys/kernel/slab/cache/shrink
+What:		/sys/kernel/slab/<cache>/shrink
 Date:		May 2007
 KernelVersion:	2.6.22
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -442,7 +442,7 @@ Description:
 		adversely impact other running applications.  So it
 		should be used with care.
 
-What:		/sys/kernel/slab/cache/slab_size
+What:		/sys/kernel/slab/<cache>/slab_size
 Date:		May 2007
 KernelVersion:	2.6.22
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -451,7 +451,7 @@ Description:
 		The slab_size file is read-only and specifies the object size
 		with metadata (debugging information and alignment) in bytes.
 
-What:		/sys/kernel/slab/cache/slabs
+What:		/sys/kernel/slab/<cache>/slabs
 Date:		May 2007
 KernelVersion:	2.6.22
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -461,7 +461,7 @@ Description:
 		there are (both cpu and partial) and from which nodes they are
 		from.
 
-What:		/sys/kernel/slab/cache/store_user
+What:		/sys/kernel/slab/<cache>/store_user
 Date:		May 2007
 KernelVersion:	2.6.22
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -470,7 +470,7 @@ Description:
 		The store_user file specifies whether the location of
 		allocation or free should be tracked for a cache.
 
-What:		/sys/kernel/slab/cache/total_objects
+What:		/sys/kernel/slab/<cache>/total_objects
 Date:		April 2008
 KernelVersion:	2.6.26
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -479,7 +479,7 @@ Description:
 		The total_objects file is read-only and displays how many total
 		objects a cache has and from which nodes they are from.
 
-What:		/sys/kernel/slab/cache/trace
+What:		/sys/kernel/slab/<cache>/trace
 Date:		May 2007
 KernelVersion:	2.6.22
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
@@ -488,7 +488,7 @@ Description:
 		The trace file specifies whether object allocations and frees
 		should be traced.
 
-What:		/sys/kernel/slab/cache/validate
+What:		/sys/kernel/slab/<cache>/validate
 Date:		May 2007
 KernelVersion:	2.6.22
 Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
-- 
2.31.1

[PATCH 8/9] ABI: security: fix location for evm and ima_policy

[Mauro Carvalho Chehab]

The What: definitions there are wrong, pointing to different
locations than what's expected.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
 Documentation/ABI/testing/evm        | 4 ++--
 Documentation/ABI/testing/ima_policy | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/Documentation/ABI/testing/evm b/Documentation/ABI/testing/evm
index 553fd8a33e56..4b76a19b7bb4 100644
--- a/Documentation/ABI/testing/evm
+++ b/Documentation/ABI/testing/evm
@@ -1,4 +1,4 @@
-What:		security/evm
+What:		/sys/kernel/security/evm /sys/kernel/security/*/evm
 Date:		March 2011
 Contact:	Mimi Zohar <zohar@us.ibm.com>
 Description:
@@ -93,7 +93,7 @@ Description:
 		core/ima-setup) have support for loading keys at boot
 		time.
 
-What:		security/integrity/evm/evm_xattrs
+What:		/sys/kernel/security/*/evm/evm_xattrs
 Date:		April 2018
 Contact:	Matthew Garrett <mjg59@google.com>
 Description:
diff --git a/Documentation/ABI/testing/ima_policy b/Documentation/ABI/testing/ima_policy
index 5c2798534950..2d84063d196f 100644
--- a/Documentation/ABI/testing/ima_policy
+++ b/Documentation/ABI/testing/ima_policy
@@ -1,4 +1,4 @@
-What:		security/ima/policy
+What:		/sys/kernel/security/*/ima/policy
 Date:		May 2008
 Contact:	Mimi Zohar <zohar@us.ibm.com>
 Description:
-- 
2.31.1

[PATCH 9/9] ABI: sysfs-module: document initstate

[Mauro Carvalho Chehab]

Despite being an old ABI, present on all modules, its documentation
is missing. Add it, based on the original commit.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
 Documentation/ABI/testing/sysfs-module | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-module b/Documentation/ABI/testing/sysfs-module
index 88bddf192ceb..08886367d047 100644
--- a/Documentation/ABI/testing/sysfs-module
+++ b/Documentation/ABI/testing/sysfs-module
@@ -41,6 +41,13 @@ KernelVersion:	3.3
 Contact:	Kay Sievers <kay.sievers@vrfy.org>
 Description:	Module size in bytes.
 
+What:		/sys/module/*/initstate
+Date:		Nov 2006
+KernelVersion:	2.6.19
+Contact:	Kay Sievers <kay.sievers@vrfy.org>
+Description:	Show the initialization state(live, coming, going) of
+		the module.
+
 What:		/sys/module/*/taint
 Date:		Jan 2012
 KernelVersion:	3.3
-- 
2.31.1

Re: [PATCH 8/9] ABI: security: fix location for evm and ima_policy

[Mimi Zohar]

Hi Mauro,

On Wed, 2021-09-08 at 16:58 +0200, Mauro Carvalho Chehab wrote:
> The What: definitions there are wrong, pointing to different
> locations than what's expected.
> 
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

What is the purpose for the asterisks in the file path?

thanks,

Mimi

> ---
>  Documentation/ABI/testing/evm        | 4 ++--
>  Documentation/ABI/testing/ima_policy | 2 +-
>  2 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/ABI/testing/evm b/Documentation/ABI/testing/evm
> index 553fd8a33e56..4b76a19b7bb4 100644
> --- a/Documentation/ABI/testing/evm
> +++ b/Documentation/ABI/testing/evm
> @@ -1,4 +1,4 @@
> -What:		security/evm
> +What:		/sys/kernel/security/evm /sys/kernel/security/*/evm
>  Date:		March 2011
>  Contact:	Mimi Zohar <zohar@us.ibm.com>
>  Description:
> @@ -93,7 +93,7 @@ Description:
>  		core/ima-setup) have support for loading keys at boot
>  		time.
>  
> -What:		security/integrity/evm/evm_xattrs
> +What:		/sys/kernel/security/*/evm/evm_xattrs
>  Date:		April 2018
>  Contact:	Matthew Garrett <mjg59@google.com>
>  Description:
> diff --git a/Documentation/ABI/testing/ima_policy b/Documentation/ABI/testing/ima_policy
> index 5c2798534950..2d84063d196f 100644
> --- a/Documentation/ABI/testing/ima_policy
> +++ b/Documentation/ABI/testing/ima_policy
> @@ -1,4 +1,4 @@
> -What:		security/ima/policy
> +What:		/sys/kernel/security/*/ima/policy
>  Date:		May 2008
>  Contact:	Mimi Zohar <zohar@us.ibm.com>
>  Description:

Re: [PATCH 0/9] get_abi.pl: Check for missing symbols at the ABI specs

[Greg KH]

On Wed, Sep 08, 2021 at 04:58:47PM +0200, Mauro Carvalho Chehab wrote:
> Hi Greg,
> 
> Sometime ago, I discussed with Jonathan Cameron about providing 
> a way check that the ABI documentation is incomplete.
> 
> While it would be doable to validate the ABI by searching __ATTR and 
> similar macros around the driver, this would probably be very complex
> and would take a while to parse.
> 
> So, I ended by implementing a new feature at scripts/get_abi.pl
> which does a check on the sysfs contents of a running system:
> it reads everything under /sys and reads the entire ABI from
> Documentation/ABI. It then warns for symbols that weren't found,
> optionally showing possible candidates that might be misdefined.
> 
> I opted to place it on 3 patches:
> 
> The first patch adds the basic logic. It runs really quicky (up to 2
> seconds), but it doesn't use sysfs softlinks.
> 
> Patch 2 adds support for also parsing softlinks. It slows the logic,
> with now takes ~40 seconds to run on my desktop (and ~23
> seconds on a HiKey970 ARM board). There are space there for
> performance improvements, by using a more sophisticated
> algorithm, at the expense of making the code harder to
> understand. I ended opting to use a simple implementation
> for now, as ~40 seconds sounds acceptable on my eyes.
> 
> Patch 3 adds an optional parameter to allow filtering the results
> using a regex given by the user.
> 
> One of the problems with the current ABI definitions is that several
> symbols define wildcards, on non-standard ways. The more commonly
> wildcards used there are:
> 
> 	<foo>
> 	{foo}
> 	[foo]
> 	X
> 	Y
> 	Z
> 	/.../
> 
> The script converts the above wildcards into (somewhat relaxed)
> regexes.
> 
> There's one place using  "(some description)". This one is harder to
> parse, as parenthesis are used by the parsing regexes. As this happens
> only on one file, patch 4 addresses such case.
> 
> Patch 5 to 9 fix some other ABI troubles I identified.
> 
> In long term, perhaps the better would be to just use regex on What:
> fields, as this would avoid extra heuristics at get_abi.pl, but this is
> OOT from this patch, and would mean a large number of changes.

This is cool stuff, thanks for doing this!

I'll look at it more once 5.15-rc1 is out, thanks.

greg k-h

Re: [PATCH 8/9] ABI: security: fix location for evm and ima_policy

[Mauro Carvalho Chehab]

Em Thu, 09 Sep 2021 09:48:11 -0400
Mimi Zohar <zohar@linux.ibm.com> escreveu:

> Hi Mauro,
> 
> On Wed, 2021-09-08 at 16:58 +0200, Mauro Carvalho Chehab wrote:
> > The What: definitions there are wrong, pointing to different
> > locations than what's expected.
> > 
> > Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>  
> 
> What is the purpose for the asterisks in the file path?

That's a standard filesystem wildcard. On ABI documents, there are
some other ways to specify it. The most used ones are:

	/sys/kernel/security/*/evm
	/sys/kernel/security/.../evm
	/sys/kernel/security/<something>/evm

(currently, there's no preferences between them)

If you check patches 1-3, the goal here is to have something
that will be replaced by this regex by scripts/get_abi.pl,
e.g. it will turn into:

	/sys/kernel/security/.*/evm

So, this what:

	What:		/sys/kernel/security/evm /sys/kernel/security/*/evm

Matches all three occurrences of evm on my system:

	/sys/kernel/security/evm
	/sys/kernel/security/integrity/evm
	/sys/kernel/security/integrity/evm/evm

Regards,
Mauro


> 
> thanks,
> 
> Mimi
> 
> > ---
> >  Documentation/ABI/testing/evm        | 4 ++--
> >  Documentation/ABI/testing/ima_policy | 2 +-
> >  2 files changed, 3 insertions(+), 3 deletions(-)
> > 
> > diff --git a/Documentation/ABI/testing/evm b/Documentation/ABI/testing/evm
> > index 553fd8a33e56..4b76a19b7bb4 100644
> > --- a/Documentation/ABI/testing/evm
> > +++ b/Documentation/ABI/testing/evm
> > @@ -1,4 +1,4 @@
> > -What:		security/evm
> > +What:		/sys/kernel/security/evm /sys/kernel/security/*/evm
> >  Date:		March 2011
> >  Contact:	Mimi Zohar <zohar@us.ibm.com>
> >  Description:
> > @@ -93,7 +93,7 @@ Description:
> >  		core/ima-setup) have support for loading keys at boot
> >  		time.
> >  
> > -What:		security/integrity/evm/evm_xattrs
> > +What:		/sys/kernel/security/*/evm/evm_xattrs
> >  Date:		April 2018
> >  Contact:	Matthew Garrett <mjg59@google.com>
> >  Description:
> > diff --git a/Documentation/ABI/testing/ima_policy b/Documentation/ABI/testing/ima_policy
> > index 5c2798534950..2d84063d196f 100644
> > --- a/Documentation/ABI/testing/ima_policy
> > +++ b/Documentation/ABI/testing/ima_policy
> > @@ -1,4 +1,4 @@
> > -What:		security/ima/policy
> > +What:		/sys/kernel/security/*/ima/policy
> >  Date:		May 2008
> >  Contact:	Mimi Zohar <zohar@us.ibm.com>
> >  Description:  
> 
> 

Re: [PATCH 4/9] ABI: sysfs-bus-usb: better document variable argument

[Heikki Krogerus]

On Wed, Sep 08, 2021 at 04:58:51PM +0200, Mauro Carvalho Chehab wrote:
> On almost all ABI documents, variable arguments are declared
> as <foo_bar>. Change it here too, in order to allow replacing
> such wildcards by regexes on a scriptable way.
> 
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>

> ---
>  Documentation/ABI/testing/sysfs-bus-usb | 16 ++++++++--------
>  1 file changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/Documentation/ABI/testing/sysfs-bus-usb b/Documentation/ABI/testing/sysfs-bus-usb
> index 73eb23bc1f34..42103f0f54d6 100644
> --- a/Documentation/ABI/testing/sysfs-bus-usb
> +++ b/Documentation/ABI/testing/sysfs-bus-usb
> @@ -166,14 +166,14 @@ Description:
>  		The file will be present for all speeds of USB devices, and will
>  		always read "no" for USB 1.1 and USB 2.0 devices.
>  
> -What:		/sys/bus/usb/devices/.../(hub interface)/portX
> +What:		/sys/bus/usb/devices/.../<hub_interface>/port<X>
>  Date:		August 2012
>  Contact:	Lan Tianyu <tianyu.lan@intel.com>
>  Description:
> -		The /sys/bus/usb/devices/.../(hub interface)/portX
> +		The /sys/bus/usb/devices/.../<hub_interface>/port<X>
>  		is usb port device's sysfs directory.
>  
> -What:		/sys/bus/usb/devices/.../(hub interface)/portX/connect_type
> +What:		/sys/bus/usb/devices/.../<hub_interface>/port<X>/connect_type
>  Date:		January 2013
>  Contact:	Lan Tianyu <tianyu.lan@intel.com>
>  Description:
> @@ -182,7 +182,7 @@ Description:
>  		The file will read "hotplug", "hardwired" and "not used" if the
>  		information is available, and "unknown" otherwise.
>  
> -What:		/sys/bus/usb/devices/.../(hub interface)/portX/location
> +What:		/sys/bus/usb/devices/.../<hub_interface>/port<X>/location
>  Date:		October 2018
>  Contact:	Bjørn Mork <bjorn@mork.no>
>  Description:
> @@ -192,7 +192,7 @@ Description:
>  		raw location value as a hex integer.
>  
>  
> -What:		/sys/bus/usb/devices/.../(hub interface)/portX/quirks
> +What:		/sys/bus/usb/devices/.../<hub_interface>/port<X>/quirks
>  Date:		May 2018
>  Contact:	Nicolas Boichat <drinkcat@chromium.org>
>  Description:
> @@ -216,7 +216,7 @@ Description:
>  		   used to help make enumeration work better on some high speed
>  		   devices.
>  
> -What:		/sys/bus/usb/devices/.../(hub interface)/portX/over_current_count
> +What:		/sys/bus/usb/devices/.../<hub_interface>/port<X>/over_current_count
>  Date:		February 2018
>  Contact:	Richard Leitner <richard.leitner@skidata.com>
>  Description:
> @@ -230,10 +230,10 @@ Description:
>  		Any time this value changes the corresponding hub device will send a
>  		udev event with the following attributes::
>  
> -		  OVER_CURRENT_PORT=/sys/bus/usb/devices/.../(hub interface)/portX
> +		  OVER_CURRENT_PORT=/sys/bus/usb/devices/.../<hub_interface>/port<X>
>  		  OVER_CURRENT_COUNT=[current value of this sysfs attribute]
>  
> -What:		/sys/bus/usb/devices/.../(hub interface)/portX/usb3_lpm_permit
> +What:		/sys/bus/usb/devices/.../<hub_interface>/port<X>/usb3_lpm_permit
>  Date:		November 2015
>  Contact:	Lu Baolu <baolu.lu@linux.intel.com>
>  Description:
> -- 
> 2.31.1

-- 
heikki

Re: [PATCH 0/9] get_abi.pl: Check for missing symbols at the ABI specs

[Mauro Carvalho Chehab]

Em Thu, 9 Sep 2021 15:51:00 +0200
Greg KH <gregkh@linuxfoundation.org> escreveu:

> On Wed, Sep 08, 2021 at 04:58:47PM +0200, Mauro Carvalho Chehab wrote:
> > Hi Greg,
> > 
> > Sometime ago, I discussed with Jonathan Cameron about providing 
> > a way check that the ABI documentation is incomplete.
> > 
> > While it would be doable to validate the ABI by searching __ATTR and 
> > similar macros around the driver, this would probably be very complex
> > and would take a while to parse.
> > 
> > So, I ended by implementing a new feature at scripts/get_abi.pl
> > which does a check on the sysfs contents of a running system:
> > it reads everything under /sys and reads the entire ABI from
> > Documentation/ABI. It then warns for symbols that weren't found,
> > optionally showing possible candidates that might be misdefined.
> > 
> > I opted to place it on 3 patches:
> > 
> > The first patch adds the basic logic. It runs really quicky (up to 2
> > seconds), but it doesn't use sysfs softlinks.
> > 
> > Patch 2 adds support for also parsing softlinks. It slows the logic,
> > with now takes ~40 seconds to run on my desktop (and ~23
> > seconds on a HiKey970 ARM board). There are space there for
> > performance improvements, by using a more sophisticated
> > algorithm, at the expense of making the code harder to
> > understand. I ended opting to use a simple implementation
> > for now, as ~40 seconds sounds acceptable on my eyes.
> > 
> > Patch 3 adds an optional parameter to allow filtering the results
> > using a regex given by the user.
> > 
> > One of the problems with the current ABI definitions is that several
> > symbols define wildcards, on non-standard ways. The more commonly
> > wildcards used there are:
> > 
> > 	<foo>
> > 	{foo}
> > 	[foo]
> > 	X
> > 	Y
> > 	Z
> > 	/.../
> > 
> > The script converts the above wildcards into (somewhat relaxed)
> > regexes.
> > 
> > There's one place using  "(some description)". This one is harder to
> > parse, as parenthesis are used by the parsing regexes. As this happens
> > only on one file, patch 4 addresses such case.
> > 
> > Patch 5 to 9 fix some other ABI troubles I identified.
> > 
> > In long term, perhaps the better would be to just use regex on What:
> > fields, as this would avoid extra heuristics at get_abi.pl, but this is
> > OOT from this patch, and would mean a large number of changes.  
> 
> This is cool stuff, thanks for doing this!
> 
> I'll look at it more once 5.15-rc1 is out, thanks.

FYI, there's a new version at:

	https://git.kernel.org/pub/scm/linux/kernel/git/mchehab/devel.git/log/?h=get_undefined

In order for get_abi.pl to convert What: into regex, changes are needed on
existing ABI files. One alternative would be to convert everything into
regex, but that would probably mean that most ABI files would require work.

In order to avoid a huge number of patches/changes, I opted to touch only
the ones that aren't following the de-facto wildcard standards already 
found on most of the ABI files. So, I added support at get_abi.pl to
consider those patterns as wildcards:

	/.../
	*
	<foo>
	X
	Y
	Z
	[0-9] (and variants)

The files that use something else meaning a wildcard need changes, in order
to avoid ambiguity when the script decides if a character is either a 
wildcard or not. 

One of the issues there is with "N". several files use it as a wildcard, 
but USB sysfs parameters have several ABI nodes with an uppercase "N"
letter (like bNumInterfaces and such). So, this one had to be converted
too (and represents the vast majority of patches).

Anyway, as the number of such patches is high, I'll submit the work 
on three separate series:

	- What: changes needed for regex conversion;
	- get_abi.pl updates;
	- Some additions for missing symbols found on my
	  desktop.

Thanks,
Mauro