linux-kernel - [PATCH 3.16 13/86] jump_label: Add jump_entry

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Message-ID: <lsq.1558022133.334738675@decadent.org.uk>
Date:   Thu, 16 May 2019 16:55:33 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Linus Torvalds" <torvalds@...ux-foundation.org>,
        "Thomas Gleixner" <tglx@...utronix.de>,
        "Peter Zijlstra" <peterz@...radead.org>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        "Ingo Molnar" <mingo@...nel.org>
Subject: [PATCH 3.16 13/86] jump_label: Add jump_entry_key() helper

3.16.68-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Peter Zijlstra <peterz@...radead.org>

commit 7dcfd915bae51571bcc339d8e3dda027287880e5 upstream.

Avoid some casting with a helper, also prepares the way for
overloading the LSB of jump_entry::key.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 kernel/jump_label.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

--- a/kernel/jump_label.c
+++ b/kernel/jump_label.c
@@ -195,6 +195,11 @@ static inline struct jump_entry *static_
 	return (struct jump_entry *)((unsigned long)key->entries & ~JUMP_TYPE_MASK);
 }
 
+static inline struct static_key *jump_entry_key(struct jump_entry *entry)
+{
+	return (struct static_key *)((unsigned long)entry->key);
+}
+
 static enum jump_label_type jump_label_type(struct static_key *key)
 {
 	bool enabled = static_key_enabled(key);
@@ -216,7 +221,7 @@ void __init jump_label_init(void)
 	for (iter = iter_start; iter < iter_stop; iter++) {
 		struct static_key *iterk;
 
-		iterk = (struct static_key *)(unsigned long)iter->key;
+		iterk = jump_entry_key(iter);
 		arch_jump_label_transform_static(iter, jump_label_type(iterk));
 		if (iterk == key)
 			continue;
@@ -311,7 +316,7 @@ static int jump_label_add_module(struct
 	for (iter = iter_start; iter < iter_stop; iter++) {
 		struct static_key *iterk;
 
-		iterk = (struct static_key *)(unsigned long)iter->key;
+		iterk = jump_entry_key(iter);
 		if (iterk == key)
 			continue;
 
@@ -348,10 +353,10 @@ static void jump_label_del_module(struct
 	struct static_key_mod *jlm, **prev;
 
 	for (iter = iter_start; iter < iter_stop; iter++) {
-		if (iter->key == (jump_label_t)(unsigned long)key)
+		if (jump_entry_key(iter) == key)
 			continue;
 
-		key = (struct static_key *)(unsigned long)iter->key;
+		key = jump_entry_key(iter);
 
 		if (within_module(iter->key, mod))
 			continue;