Re: [PATCH v8 4/8] ppc64 ftrace_with_regs configuration variables
From: Balbir Singh <bsingharora@gmail.com>
Date: 2016-02-11 07:48:26
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On Wed, 2016-02-10 at 17:25 +0100, Torsten Duwe wrote: snip
quoted hunk ↗ jump to hunk
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