[PATCH v4 2/3] perf lock: Fix the wrong name percpu-rwsem

[Chun-Tse Shao <ctshao@google.com>]

In `perf lock --help`, the name of `percpu-rwsem` should be
`pcpu-rwsem`. This patch fixes the naming in `lock_type_table`, and also
replaces the mismatched name `percpu-rwsem` before parsing it for
backward compatibility.

Tested `./perf lock con -ab -Y pcpu-sem` and `./perf lock con -ab -Y
percpu-rwsem`

Fixes: 4f701063bfa2 ("perf lock contention: Show lock type with address")
Signed-off-by: Chun-Tse Shao <ctshao@google.com>
---
 tools/perf/builtin-lock.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-lock.c b/tools/perf/builtin-lock.c
index 7e36bbe3cb80..264acfa648e4 100644
--- a/tools/perf/builtin-lock.c
+++ b/tools/perf/builtin-lock.c
@@ -1587,8 +1587,8 @@ static const struct {
 	{ LCB_F_RT,			"rt-mutex",	"rt-mutex" },
 	{ LCB_F_RT | LCB_F_READ,	"rwlock-rt:R",	"rwlock-rt" },
 	{ LCB_F_RT | LCB_F_WRITE,	"rwlock-rt:W",	"rwlock-rt" },
-	{ LCB_F_PERCPU | LCB_F_READ,	"pcpu-sem:R",	"percpu-rwsem" },
-	{ LCB_F_PERCPU | LCB_F_WRITE,	"pcpu-sem:W",	"percpu-rwsem" },
+	{ LCB_F_PERCPU | LCB_F_READ,	"pcpu-sem:R",	"pcpu-sem" },
+	{ LCB_F_PERCPU | LCB_F_WRITE,	"pcpu-sem:W",	"pcpu-sem" },
 	{ LCB_F_MUTEX,			"mutex",	"mutex" },
 	{ LCB_F_MUTEX | LCB_F_SPIN,	"mutex",	"mutex" },
 };
@@ -2365,7 +2365,11 @@ static int parse_lock_type(const struct option *opt __maybe_unused, const char *
 		/*
 		 * Otherwise `tok` is `name` in `lock_type_table`.
 		 * Single lock name could contain multiple flags.
+		 * By documentation, `percpu-rwmem` should be `pcpu-sem`.
+		 * For backward compatibility, we replace `percpu-rwmem` with `pcpu-sem`.
 		 */
+		if (!strcmp(tok, "percpu-rwsem"))
+			tok = (char *)"pcpu-sem";
 		for (unsigned int i = 0; i < ARRAY_SIZE(lock_type_table); i++) {
 			if (!strcmp(lock_type_table[i].name, tok)) {
 				if (add_lock_type(lock_type_table[i].flags)) {
-- 
2.47.0.338.g60cca15819-goog