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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>

authored by

Jiri Olsa and committed by
Steven Rostedt (Google) 50b35c9e f35dbac6

+2 -2
+2 -2
kernel/trace/ftrace.c
··· 6606 6606 if (!orig_hash) 6607 6607 goto unlock; 6608 6608 6609 - /* Enable the tmp_ops to have the same functions as the direct ops */ 6609 + /* Enable the tmp_ops to have the same functions as the hash object. */ 6610 6610 ftrace_ops_init(&tmp_ops); 6611 - tmp_ops.func_hash = ops->func_hash; 6611 + tmp_ops.func_hash->filter_hash = hash; 6612 6612 6613 6613 err = register_ftrace_function_nolock(&tmp_ops); 6614 6614 if (err)