From 9189c7e706038a508567cb2e46ccdb68b08f4ac7 Mon Sep 17 00:00:00 2001 From: Joe Perches Date: Fri, 7 Sep 2018 15:26:18 -0700 Subject: [PATCH] checkpatch: Create table of obsolete APIs and apply to RCU This patch creates a deprecated_apis map, which allows such APIs to be flagged with suggested replacements more compactly and straightforwardly. It also uses this map to flag the old flavorful RCU APIs as deprecated, suggesting their vanilla-RCU counterparts as replacements. Signed-off-by: Joe Perches Cc: Andy Whitcroft Signed-off-by: Paul E. McKenney [ paulmck: Merged with earlier less-deft approach. ] --- scripts/checkpatch.pl | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl index c883ec55654f..dd29e3c28166 100755 --- a/scripts/checkpatch.pl +++ b/scripts/checkpatch.pl @@ -573,6 +573,27 @@ foreach my $entry (@mode_permission_funcs) { } $mode_perms_search = "(?:${mode_perms_search})"; +our %deprecated_apis = ( + "synchronize_rcu_bh" => "synchronize_rcu", + "synchronize_rcu_bh_expedited" => "synchronize_rcu_expedited", + "call_rcu_bh" => "call_rcu", + "rcu_barrier_bh" => "rcu_barrier", + "synchronize_sched" => "synchronize_rcu", + "synchronize_sched_expedited" => "synchronize_rcu_expedited", + "call_rcu_sched" => "call_rcu", + "rcu_barrier_sched" => "rcu_barrier", + "get_state_synchronize_sched" => "get_state_synchronize_rcu", + "cond_synchronize_sched" => "cond_synchronize_rcu", +); + +#Create a search pattern for all these strings to speed up a loop below +our $deprecated_apis_search = ""; +foreach my $entry (keys %deprecated_apis) { + $deprecated_apis_search .= '|' if ($deprecated_apis_search ne ""); + $deprecated_apis_search .= $entry; +} +$deprecated_apis_search = "(?:${deprecated_apis_search})"; + our $mode_perms_world_writable = qr{ S_IWUGO | S_IWOTH | @@ -6368,6 +6389,14 @@ sub process { "please use device_initcall() or more appropriate function instead of __initcall() (see include/linux/init.h)\n" . $herecurr); } +# check for deprecated apis + if ($line =~ /\b($deprecated_apis_search)\b\s*\(/) { + my $deprecated_api = $1; + my $new_api = $deprecated_apis{$deprecated_api}; + WARN("DEPRECATED_API", + "Deprecated use of '$deprecated_api', prefer '$new_api' instead\n" . $herecurr); + } + # check for various structs that are normally const (ops, kgdb, device_tree) # and avoid what seem like struct definitions 'struct foo {' if ($line !~ /\bconst\b/ &&