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samples: bpf: Replace symbol compare of trace_event 

Previously, when this sample is added, commit 1c47910ef8
("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: 1c47910ef8 ("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
This commit is contained in:
Daniel T. Lee 2019-12-05 17:01:13 +09:00 committed by Alexei Starovoitov
parent 7f193c2519
commit bba1b2a890
1 changed files with 2 additions and 2 deletions
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4
samples/bpf/trace_event_user.c
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@ -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;
}