From 9189c7e706038a508567cb2e46ccdb68b08f4ac7 Mon Sep 17 00:00:00 2001 From: Joe Perches Date: Fri, 7 Sep 2018 15:26:18 -0700 Subject: 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(+) (limited to 'scripts') 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/ && -- cgit v1.2.3-59-g8ed1b From 3d709ab5a1767d422223e84cf5c20f0d33738274 Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Sun, 11 Nov 2018 10:49:10 -0800 Subject: checkpatch.pl: Suggest lockdep instead of asserting !spin_is_locked() This commit points people who might otherwise code up something like WARN_ON(!spin_is_locked(&mylock)) to lockdep_assert_held(&mylock). Signed-off-by: Paul E. McKenney Cc: Andy Whitcroft Cc: Joe Perches --- scripts/checkpatch.pl | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'scripts') diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl index dd29e3c28166..377f373db6c0 100755 --- a/scripts/checkpatch.pl +++ b/scripts/checkpatch.pl @@ -6389,6 +6389,12 @@ sub process { "please use device_initcall() or more appropriate function instead of __initcall() (see include/linux/init.h)\n" . $herecurr); } +# check for spin_is_locked(), suggest lockdep instead + if ($line =~ /\bspin_is_locked\(/) { + WARN("USE_LOCKDEP", + "Where possible, use lockdep_assert_held instead of assertions based on spin_is_locked\n" . $herecurr); + } + # check for deprecated apis if ($line =~ /\b($deprecated_apis_search)\b\s*\(/) { my $deprecated_api = $1; -- cgit v1.2.3-59-g8ed1b