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- #!/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
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