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fprobe: Fix sparse warning for acccessing __rcu ftrace_hash 

Since ftrace_ops::local_hash::filter_hash field is an __rcu pointer,
we have to use rcu_access_pointer() to access it.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/164802093635.1732982.4938094876018890866.stgit@devnote2
This commit is contained in:
Masami Hiramatsu 2022-03-23 16:35:36 +09:00 committed by Alexei Starovoitov
parent 9052e4e837
commit 261608f310
1 changed files with 1 additions and 1 deletions
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2
kernel/trace/fprobe.c
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@ -215,7 +215,7 @@ int register_fprobe(struct fprobe *fp, const char *filter, const char *notfilter
* correctly calculate the total number of filtered symbols
* from both filter and notfilter.
*/
hash = fp->ops.local_hash.filter_hash;
hash = rcu_access_pointer(fp->ops.local_hash.filter_hash);
if (WARN_ON_ONCE(!hash))
goto out;