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samples: bpf: Replace symbol compare of trace_event 

[ Upstream commit bba1b2a890 ]

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
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Daniel T. Lee 2019-12-05 17:01:13 +09:00 committed by Greg Kroah-Hartman
parent 328133b1c1
commit b50ba34bdb
1 changed files with 2 additions and 2 deletions
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4
samples/bpf/trace_event_user.c
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@ -34,9 +34,9 @@ static void print_ksym(__u64 addr)
return;
sym = ksym_search(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;
}