From: Daniel T. Lee danieltimlee@gmail.com
[ Upstream commit bba1b2a890253528c45aa66cf856f289a215bfbc ]
Previously, when this sample is added, commit 1c47910ef8013 ("samples/bpf: add perf_event+bpf example"), a symbol 'sys_read' and 'sys_write' has been used without no prefixes. But currently there are no exact symbols with these under kallsyms and this leads to failure.
This commit changes exact compare to substring compare to keep compatible with exact symbol or prefixed symbol.
Fixes: 1c47910ef8013 ("samples/bpf: add perf_event+bpf example") Signed-off-by: Daniel T. Lee danieltimlee@gmail.com Signed-off-by: Alexei Starovoitov ast@kernel.org Link: https://lore.kernel.org/bpf/20191205080114.19766-2-danieltimlee@gmail.com Signed-off-by: Sasha Levin sashal@kernel.org --- samples/bpf/trace_event_user.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/samples/bpf/trace_event_user.c b/samples/bpf/trace_event_user.c index 16a16eadd509..749a50f2f9f3 100644 --- a/samples/bpf/trace_event_user.c +++ b/samples/bpf/trace_event_user.c @@ -37,9 +37,9 @@ static void print_ksym(__u64 addr) }
printf("%s;", sym->name); - if (!strcmp(sym->name, "sys_read")) + if (!strstr(sym->name, "sys_read")) sys_read_seen = true; - else if (!strcmp(sym->name, "sys_write")) + else if (!strstr(sym->name, "sys_write")) sys_write_seen = true; }