Commit 50b35c9e50a8 for kernel

commit 50b35c9e50a865600344ab1d8f9a8b3384d7e63d
Author: Jiri Olsa <jolsa@kernel.org>
Date:   Thu Mar 12 13:37:38 2026 +0100

    ftrace: Use hash argument for tmp_ops in update_ftrace_direct_mod

    The modify logic registers temporary ftrace_ops object (tmp_ops) to trigger
    the slow path for all direct callers to be able to safely modify attached
    addresses.

    At the moment we use ops->func_hash for tmp_ops filter, which represents all
    the systems attachments. It's faster to use just the passed hash filter, which
    contains only the modified sites and is always a subset of the ops->func_hash.

    Cc: Alexei Starovoitov <ast@kernel.org>
    Cc: Daniel Borkmann <daniel@iogearbox.net>
    Cc: Andrii Nakryiko <andrii@kernel.org>
    Cc: Menglong Dong <menglong8.dong@gmail.com>
    Cc: Song Liu <song@kernel.org>
    Link: https://patch.msgid.link/20260312123738.129926-1-jolsa@kernel.org
    Fixes: e93672f770d7 ("ftrace: Add update_ftrace_direct_mod function")
    Signed-off-by: Jiri Olsa <jolsa@kernel.org>
    Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 8df69e702706..413310912609 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -6606,9 +6606,9 @@ int update_ftrace_direct_mod(struct ftrace_ops *ops, struct ftrace_hash *hash, b
 	if (!orig_hash)
 		goto unlock;

-	/* Enable the tmp_ops to have the same functions as the direct ops */
+	/* Enable the tmp_ops to have the same functions as the hash object. */
 	ftrace_ops_init(&tmp_ops);
-	tmp_ops.func_hash = ops->func_hash;
+	tmp_ops.func_hash->filter_hash = hash;

 	err = register_ftrace_function_nolock(&tmp_ops);
 	if (err)