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Toolchains don't always default to the ELFv2 ABI. This is true with at least the kernel.org toolchains. As such, pass -mabi=elfv2 explicitly to ensure that we are testing against the correct compiler output. Signed-off-by: Naveen N Rao <naveen@kernel.org> [mpe: Tweak comment wording] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://msgid.link/20230530093821.298590-1-naveen@kernel.org
27 lines
880 B
Bash
Executable file
27 lines
880 B
Bash
Executable file
#!/bin/bash
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# SPDX-License-Identifier: GPL-2.0
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set -e
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set -o pipefail
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# To debug, uncomment the following line
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# set -x
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# -mprofile-kernel is only supported on 64-bit with ELFv2, so this should not
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# be invoked for other targets. Therefore we can pass in -m64 and -mabi
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# explicitly, to take care of toolchains defaulting to other targets.
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# Test whether the compile option -mprofile-kernel exists and generates
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# profiling code (ie. a call to _mcount()).
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echo "int func() { return 0; }" | \
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$* -m64 -mabi=elfv2 -S -x c -O2 -p -mprofile-kernel - -o - \
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2> /dev/null | grep -q "_mcount"
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# Test whether the notrace attribute correctly suppresses calls to _mcount().
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echo -e "#include <linux/compiler.h>\nnotrace int func() { return 0; }" | \
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$* -m64 -mabi=elfv2 -S -x c -O2 -p -mprofile-kernel - -o - \
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2> /dev/null | grep -q "_mcount" && \
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exit 1
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exit 0
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