[PATCH net v3] selftests: net: fix rps_default_mask with >32 CPUs

[Jakub Kicinski <kuba@kernel.org>]

If there is more than 32 cpus the bitmask will start to contain
commas, leading to:

./rps_default_mask.sh: line 36: [: 00000000,00000000: integer expression expected

Remove the commas, bash doesn't interpret leading zeroes as oct
so that should be good enough. Switch to bash, Simon reports that
not all shells support this type of substitution.

Fixes: c12e0d5f267d ("self-tests: introduce self-tests for RPS default mask")
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
v3:
 - switch to bash
v2: https://lore.kernel.org/all/20240120210256.3864747-1-kuba@kernel.org/
 - remove all commas
v1: https://lore.kernel.org/all/20240119151248.3476897-1-kuba@kernel.org/

CC: shuah@kernel.org
CC: horms@kernel.org
CC: linux-kselftest@vger.kernel.org
---
 tools/testing/selftests/net/rps_default_mask.sh | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/net/rps_default_mask.sh b/tools/testing/selftests/net/rps_default_mask.sh
index a26c5624429f..4287a8529890 100755
--- a/tools/testing/selftests/net/rps_default_mask.sh
+++ b/tools/testing/selftests/net/rps_default_mask.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # SPDX-License-Identifier: GPL-2.0
 
 readonly ksft_skip=4
@@ -33,6 +33,10 @@ chk_rps() {
 
 	rps_mask=$($cmd /sys/class/net/$dev_name/queues/rx-0/rps_cpus)
 	printf "%-60s" "$msg"
+
+	# In case there is more than 32 CPUs we need to remove commas from masks
+	rps_mask=${rps_mask//,}
+	expected_rps_mask=${expected_rps_mask//,}
 	if [ $rps_mask -eq $expected_rps_mask ]; then
 		echo "[ ok ]"
 	else
-- 
2.43.0