1#!/bin/bash
 2# SPDX-License-Identifier: GPL-2.0
 3
 4set -e
 5set -o pipefail
 6
 7# To debug, uncomment the following line
 8# set -x
 9
10# -mprofile-kernel is only supported on 64-bit with ELFv2, so this should not
11# be invoked for other targets. Therefore we can pass in -m64 and -mabi
12# explicitly, to take care of toolchains defaulting to other targets.
13
14# Test whether the compile option -mprofile-kernel exists and generates
15# profiling code (ie. a call to _mcount()).
16echo "int func() { return 0; }" | \
17    $* -m64 -mabi=elfv2 -S -x c -O2 -p -mprofile-kernel - -o - \
18    2> /dev/null | grep -q "_mcount"
19
20# Test whether the notrace attribute correctly suppresses calls to _mcount().
21
22echo -e "#include <linux/compiler.h>\nnotrace int func() { return 0; }" | \
23    $* -m64 -mabi=elfv2 -S -x c -O2 -p -mprofile-kernel - -o - \
24    2> /dev/null | grep -q "_mcount" && \
25    exit 1
26
27exit 0

 1#!/bin/bash
 2# SPDX-License-Identifier: GPL-2.0
 3
 4set -e
 5set -o pipefail
 6
 7# To debug, uncomment the following line
 8# set -x
 9
10# -mprofile-kernel is only supported on 64le, so this should not be invoked
11# for other targets. Therefore we can pass in -m64 and -mlittle-endian
12# explicitly, to take care of toolchains defaulting to other targets.
13
14# Test whether the compile option -mprofile-kernel exists and generates
15# profiling code (ie. a call to _mcount()).
16echo "int func() { return 0; }" | \
17    $* -m64 -mlittle-endian -S -x c -O2 -p -mprofile-kernel - -o - \
18    2> /dev/null | grep -q "_mcount"
19
20# Test whether the notrace attribute correctly suppresses calls to _mcount().
21
22echo -e "#include <linux/compiler.h>\nnotrace int func() { return 0; }" | \
23    $* -m64 -mlittle-endian -S -x c -O2 -p -mprofile-kernel - -o - \
24    2> /dev/null | grep -q "_mcount" && \
25    exit 1
26
27exit 0