forked from mirrors/linux
abba759796
This eliminates the workaround that requires disabling -mprofile-kernel by default in Kconfig. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Acked-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
27 lines
885 B
Bash
Executable file
27 lines
885 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 64le, so this should not be invoked
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# for other targets. Therefore we can pass in -m64 and -mlittle-endian
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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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$* -m64 -mlittle-endian -S -x c -O2 -p -mprofile-kernel - -o - \
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2> /dev/null | grep -q "_mcount"
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# Test whether the notrace attribute correctly suppresses calls to _mcount().
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echo -e "#include <linux/compiler.h>\nnotrace int func() { return 0; }" | \
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$* -m64 -mlittle-endian -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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