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ftrace: Add update_ftrace_direct_mod function

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Adding update_ftrace_direct_mod function that modifies all entries
(ip -> direct) provided in hash argument to direct ftrace ops and
updates its attachments.

The difference to current modify_ftrace_direct is:
- hash argument that allows to modify multiple ip -> direct
  entries at once

This change will allow us to have simple ftrace_ops for all bpf
direct interface users in following changes.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Link: https://lore.kernel.org/bpf/20251230145010.103439-7-jolsa@kernel.org
This commit is contained in:
Jiri Olsa
2025-12-30 15:50:07 +01:00
committed by Andrii Nakryiko
parent 8d2c1233f3
commit e93672f770
2 changed files with 100 additions and 0 deletions
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6
include/linux/ftrace.h
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@@ -545,6 +545,7 @@ int modify_ftrace_direct_nolock(struct ftrace_ops *ops, unsigned long addr);
int update_ftrace_direct_add(struct ftrace_ops *ops, struct ftrace_hash *hash);
int update_ftrace_direct_del(struct ftrace_ops *ops, struct ftrace_hash *hash);
int update_ftrace_direct_mod(struct ftrace_ops *ops, struct ftrace_hash *hash, bool do_direct_lock);
void ftrace_stub_direct_tramp(void);
@@ -582,6 +583,11 @@ static inline int update_ftrace_direct_del(struct ftrace_ops *ops, struct ftrace
return -ENODEV;
}
static inline int update_ftrace_direct_mod(struct ftrace_ops *ops, struct ftrace_hash *hash, bool do_direct_lock)
{
return -ENODEV;
}
/*
* This must be implemented by the architecture.
* It is the way the ftrace direct_ops helper, when called