On Wed, 2016-02-10 at 17:25 +0100, Torsten Duwe wrote:
snip
> diff --git a/arch/powerpc/gcc-mprofile-kernel-notrace.sh b/arch/powerpc/gcc-mprofile-kernel-notrace.sh
> new file mode 100755
> index 0000000..68d6482
> --- /dev/null
> +++ b/arch/powerpc/gcc-mprofile-kernel-notrace.sh
> @@ -0,0 +1,33 @@
> +#!/bin/sh
> +# Test whether the compile option -mprofile-kernel
> +# generates profiling code ( = a call to mcount), and
> +# whether a function without any global references sets
> +# the TOC pointer properly at the beginning, and
> +# whether the "notrace" function attribute successfully
> +# suppresses the _mcount call.
> +
> +echo "int func() { return 0; }" | \
> + $* -S -x c -O2 -p -mprofile-kernel - -o - 2> /dev/null | \
> + grep -q "mcount"
> +
> +trace_result=$?
> +
> +echo "int func() { return 0; }" | \
> + $* -S -x c -O2 -p -mprofile-kernel - -o - 2> /dev/null | \
> + sed -n -e '/func:/,/bl _mcount/p' | grep -q TOC
> +
> +leaf_toc_result=$?
> +
leaf_toc_result failed for me with gcc 5. I'll try and grab gcc-6
and give the patches a spin
> +/bin/echo -e "#include \nnotrace int func() { return 0; }" | \
> + $* -S -x c -O2 -p -mprofile-kernel - -o - 2> /dev/null | \
> + grep -q "mcount"
> +
> +notrace_result=$?
> +
> +if [ "$trace_result" -eq "0" -a \
> + "$leaf_toc_result" -eq "0" -a \
> + "$notrace_result" -eq "1" ]; then
> + echo y
> +else
> + echo n
> +fi
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