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 28