[PATCH] perf tests: Change shebang for stat_bpf_counters.sh to #!/bin/bash

[Salvatore Bonaccorso]

When commit b02027776ac5 ("perf tests: Fix flakiness in BPF counters
test on hybrid systems") was backported to several stable series
(v5.15.221, v6.1.188, v6.6.157, v6.12.110, v6.18.52, v7.2.6) it
introduced specific bash syntax. For versions after 2f5d370dec3f ("perf
test: Change all remaining #!/bin/sh to #!/bin/bash") in v6.17-rc1 this
is not a problem as the shebang was already hanged to #!/bin/bash. For
the older stable series this introduced invalid syntax if #!/bin/sh is
not bash:

	$ sh -n tools/perf/tests/shell/stat_bpf_counters.sh
	tools/perf/tests/shell/stat_bpf_counters.sh: 12: Syntax error: "(" unexpected

	$ checkbashism tools/perf/tests/shell/stat_bpf_counters.sh
	possible bashism in tools/perf/tests/shell/stat_bpf_counters.sh line 52 (bash arrays, ${name[0|*|@]}):
		base_instructions=$(perf stat --no-big-num -e instructions:u -- "${workload[@]}" 2>&1 | \
					awk -v i=0 -v c=0 '/instructions/ { \
						if ($1 != "<not") { i++; c += $1 } \
					} END { if (i > 0) printf "%.0f", c; else print "<not" }')
	possible bashism in tools/perf/tests/shell/stat_bpf_counters.sh line 57 (bash arrays, ${name[0|*|@]}):
		bpf_instructions=$(perf stat --no-big-num --bpf-counters -e instructions:u \
					-- "${workload[@]}"  2>&1 | \
					awk -v i=0 -v c=0 '/instructions/ { \
						if ($1 != "<not") { i++; c += $1 } \
					} END { if (i > 0) printf "%.0f", c; else print "<not" }')
	possible bashism in tools/perf/tests/shell/stat_bpf_counters.sh line 68 (bash arrays, ${name[0|*|@]}):
		stat_output=$(perf stat --no-big-num \
			-e instructions/name=base_instructions/u,instructions/name=bpf_instructions/bu \
			-- "${workload[@]}" 2>&1)

Change shebang for the stat_bpf_counters.sh script.

No upstream commit exists for this change as for versions post 6.17-rc1
the scripts were converted to #!/bin/bash already.

Signed-off-by: Salvatore Bonaccorso <carnil@xxxxxxxxxx>
---
 tools/perf/tests/shell/stat_bpf_counters.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/tests/shell/stat_bpf_counters.sh b/tools/perf/tests/shell/stat_bpf_counters.sh
index 76d4a7f15a43..c4f71bfc0fc6 100755
--- a/tools/perf/tests/shell/stat_bpf_counters.sh
+++ b/tools/perf/tests/shell/stat_bpf_counters.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # perf stat --bpf-counters test
 # SPDX-License-Identifier: GPL-2.0
 
-- 
2.55.0