Messages in this thread Patch in this message | | | From | Masami Hiramatsu <> | Subject | [PATCH bpf-next 2/2] fprobe: Fix sparse warning for acccessing __rcu ftrace_hash | Date | Wed, 23 Mar 2022 16:35:36 +0900 |
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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> --- kernel/trace/fprobe.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/trace/fprobe.c b/kernel/trace/fprobe.c index 63b2321b22a0..89d9f994ebb0 100644 --- a/kernel/trace/fprobe.c +++ b/kernel/trace/fprobe.c @@ -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;
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