checkpatch: externalize the structs that should be const

Make it easier to add new structs that should be const.

Link: http://lkml.kernel.org/r/e5a8da43e7c11525bafbda1ca69a8323614dd942.1472664220.git.joe@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Julia Lawall <julia.lawall@lip6.fr>
Cc: Kees Cook <keescook@chromium.org>
Cc: Andy Whitcroft <apw@canonical.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 63 insertions, 40 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 37d8b91ac198..4ecb66c595f4 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -54,6 +54,7 @@ my $min_conf_desc_length = 4;
 my $spelling_file = "$D/spelling.txt";
 my $codespell = 0;
 my $codespellfile = "/usr/share/codespell/dictionary.txt";
+my $conststructsfile = "$D/const_structs.checkpatch";
 my $color = 1;
 my $allow_c99_comments = 1;
 
@@ -624,6 +625,29 @@ if ($codespell) {
 
 $misspellings = join("|", sort keys %spelling_fix) if keys %spelling_fix;
 
+my $const_structs = "";
+if (open(my $conststructs, '<', $conststructsfile)) {
+        while (<$conststructs>) {
+                my $line = $_;
+
+                $line =~ s/\s*\n?$//g;
+                $line =~ s/^\s*//g;
+
+                next if ($line =~ m/^\s*#/);
+                next if ($line =~ m/^\s*$/);
+                if ($line =~ /\s/) {
+                        print("$conststructsfile: '$line' invalid - ignored\n");
+                        next;
+                }
+
+                $const_structs .= '|' if ($const_structs ne "");
+                $const_structs .= $line;
+        }
+        close($conststructsfile);
+} else {
+        warn "No structs that should be const will be found - file '$conststructsfile': $!\n";
+}
+
 sub build_types {
         my $mods = "(?x:  \n" . join("|\n  ", (@modifierList, @modifierListFile)) . "\n)";
         my $all = "(?x:  \n" . join("|\n  ", (@typeList, @typeListFile)) . "\n)";
@@ -5912,46 +5936,6 @@ sub process {
                 }
 
 # check for various structs that are normally const (ops, kgdb, device_tree)
-                my $const_structs = qr{
-                                acpi_dock_ops|
-                                address_space_operations|
-                                backlight_ops|
-                                block_device_operations|
-                                dentry_operations|
-                                dev_pm_ops|
-                                dma_map_ops|
-                                extent_io_ops|
-                                file_lock_operations|
-                                file_operations|
-                                hv_ops|
-                                ide_dma_ops|
-                                intel_dvo_dev_ops|
-                                item_operations|
-                                iwl_ops|
-                                kgdb_arch|
-                                kgdb_io|
-                                kset_uevent_ops|
-                                lock_manager_operations|
-                                microcode_ops|
-                                mtrr_ops|
-                                neigh_ops|
-                                nlmsvc_binding|
-                                of_device_id|
-                                pci_raw_ops|
-                                pipe_buf_operations|
-                                platform_hibernation_ops|
-                                platform_suspend_ops|
-                                proto_ops|
-                                rpc_pipe_ops|
-                                seq_operations|
-                                snd_ac97_build_ops|
-                                soc_pcmcia_socket_ops|
-                                stacktrace_ops|
-                                sysfs_ops|
-                                tty_operations|
-                                uart_ops|
-                                usb_mon_operations|
-                                wd_ops}x;
                 if ($line !~ /\bconst\b/ &&
                     $line =~ /\bstruct\s+($const_structs)\b/) {
                         WARN("CONST_STRUCT",
diff --git a/scripts/const_structs.checkpatch b/scripts/const_structs.checkpatch
new file mode 100644
index 000000000000..1b54425f6c89
--- /dev/null
+++ b/scripts/const_structs.checkpatch
@@ -0,0 +1,39 @@
+acpi_dock_ops
+address_space_operations
+backlight_ops
+block_device_operations
+dentry_operations
+dev_pm_ops
+dma_map_ops
+extent_io_ops
+file_lock_operations
+file_operations
+hv_ops
+ide_dma_ops
+intel_dvo_dev_ops
+item_operations
+iwl_ops
+kgdb_arch
+kgdb_io
+kset_uevent_ops
+lock_manager_operations
+microcode_ops
+mtrr_ops
+neigh_ops
+nlmsvc_binding
+of_device_id
+pci_raw_ops
+pipe_buf_operations
+platform_hibernation_ops
+platform_suspend_ops
+proto_ops
+rpc_pipe_ops
+seq_operations
+snd_ac97_build_ops
+soc_pcmcia_socket_ops
+stacktrace_ops
+sysfs_ops
+tty_operations
+uart_ops
+usb_mon_operations
+wd_ops