[PATCH V5 4/7] jump_label: Sort entries of the same key by the code

[Daniel Bristot de Oliveira <bristot@redhat.com>]

In the batching mode, entries with the same key should also be sorted by the
code, enabling a bsearch() of a code/addr when updating a key.

Signed-off-by: Daniel Bristot de Oliveira <bristot@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: "Steven Rostedt (VMware)" <rostedt@goodmis.org>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: "Peter Zijlstra (Intel)" <peterz@infradead.org>
Cc: Chris von Recklinghausen <crecklin@redhat.com>
Cc: Jason Baron <jbaron@akamai.com>
Cc: Scott Wood <swood@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Clark Williams <williams@redhat.com>
Cc: x86@kernel.org
Cc: linux-kernel@vger.kernel.org
---
 kernel/jump_label.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/kernel/jump_label.c b/kernel/jump_label.c
index e666a4d6642a..8b7bfbba4cef 100644
--- a/kernel/jump_label.c
+++ b/kernel/jump_label.c
@@ -36,12 +36,28 @@ static int jump_label_cmp(const void *a, const void *b)
 	const struct jump_entry *jea = a;
 	const struct jump_entry *jeb = b;
 
+	/*
+	 * Entrires are sorted by key.
+	 */
 	if (jump_entry_key(jea) < jump_entry_key(jeb))
 		return -1;
 
 	if (jump_entry_key(jea) > jump_entry_key(jeb))
 		return 1;
 
+#ifdef HAVE_JUMP_LABEL_BATCH
+	/*
+	 * In the batching mode, entries should also be sorted by the code
+	 * inside the already sorted list of entries, enabling a bsearch in
+	 * the vector.
+	 */
+	if (jump_entry_code(jea) < jump_entry_code(jeb))
+		return -1;
+
+	if (jump_entry_code(jea) > jump_entry_code(jeb))
+		return 1;
+#endif
+
 	return 0;
 }
 
-- 
2.20.1