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