perf test: Change all remaining #!/bin/sh to #!/bin/bash

JIRA: https://issues.redhat.com/browse/RHEL-78200

upstream
========
commit 2f5d370
Author: James Clark <james.clark@linaro.org>
Date: Mon Jun 23 10:00:12 2025 +0100

description
===========
There are 43 instances of posix shell tests and 35 instances of bash. To
give us a single consistent language for testing in, replace
all #!/bin/sh to #!/bin/bash. Common sources that are included in both
different shells will now work as expected. And we no longer have to fix
up bashisms that appear to work when someone's system has sh symlinked
to bash, but don't work on other systems that have both shells
installed.

Although we could have chosen sh, it's not backwards compatible so it
wouldn't be possible to bulk convert without re-writing the existing
bash tests.

Choosing bash also gives us some nicer features including 'local'
variable definitions and regexes in if statements that are already
widely used in the tests.

It's not expected that there are any users with only sh available due to
the large number of bash tests that exist.

Discussed in relation to running shellcheck here:
https://lore.kernel.org/linux-perf-users/e3751a74be34bbf3781c4644f518702a7270220b.1749785642.git.collin.funk1@gmail.com/

    Signed-off-by: James Clark <james.clark@linaro.org>
    Reviewed-by: Collin Funk <collin.funk1@gmail.com>
    Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com>
    Link: https://lore.kernel.org/r/20250623-james-perf-bash-tests-v1-1-f572f54d4559@linaro.org
    Signed-off-by: Namhyung Kim <namhyung@kernel.org>

Signed-off-by: Anubhav Shelat <ashelat@redhat.com>

Author: AnubhavS1

tools/perf/tests/perf-targz-src-pkg

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # SPDX-License-Identifier: GPL-2.0
 # Test one of the main kernel Makefile targets to generate a perf sources tarball
 # suitable for build outside the full kernel sources.

tools/perf/tests/shell/amd-ibs-swfilt.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # AMD IBS software filtering
 
 echo "check availability of IBS swfilt"

tools/perf/tests/shell/buildid.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # build id cache operations
 # SPDX-License-Identifier: GPL-2.0
 

tools/perf/tests/shell/coresight/asm_pure_loop.sh

@@ -1,4 +1,4 @@
-#!/bin/sh -e
+#!/bin/bash -e
 # CoreSight / ASM Pure Loop (exclusive)
 
 # SPDX-License-Identifier: GPL-2.0

tools/perf/tests/shell/coresight/memcpy_thread_16k_10.sh

@@ -1,4 +1,4 @@
-#!/bin/sh -e
+#!/bin/bash -e
 # CoreSight / Memcpy 16k 10 Threads (exclusive)
 
 # SPDX-License-Identifier: GPL-2.0

tools/perf/tests/shell/coresight/thread_loop_check_tid_10.sh

@@ -1,4 +1,4 @@
-#!/bin/sh -e
+#!/bin/bash -e
 # CoreSight / Thread Loop 10 Threads - Check TID (exclusive)
 
 # SPDX-License-Identifier: GPL-2.0

tools/perf/tests/shell/coresight/thread_loop_check_tid_2.sh

@@ -1,4 +1,4 @@
-#!/bin/sh -e
+#!/bin/bash -e
 # CoreSight / Thread Loop 2 Threads - Check TID (exclusive)
 
 # SPDX-License-Identifier: GPL-2.0

tools/perf/tests/shell/coresight/unroll_loop_thread_10.sh

@@ -1,4 +1,4 @@
-#!/bin/sh -e
+#!/bin/bash -e
 # CoreSight / Unroll Loop Thread 10 (exclusive)
 
 # SPDX-License-Identifier: GPL-2.0

tools/perf/tests/shell/diff.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # perf diff tests
 # SPDX-License-Identifier: GPL-2.0
 

tools/perf/tests/shell/ftrace.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # perf ftrace tests
 # SPDX-License-Identifier: GPL-2.0