powerpc/tools: Pass -mabi=elfv2 to gcc-check-mprofile-kernel.sh

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

Author: rnav

arch/powerpc/tools/gcc-check-mprofile-kernel.sh

@@ -7,21 +7,20 @@ set -o pipefail
 # To debug, uncomment the following line
 # set -x
 
-# -mprofile-kernel is only supported on 64-bit, so this should not be invoked
-# for 32-bit. We pass in -m64 explicitly, and -mbig-endian and -mlittle-endian
-# are passed in from Kconfig, which takes care of toolchains defaulting to
-# other targets.
+# -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 -S -x c -O2 -p -mprofile-kernel - -o - \
+    $* -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 -S -x c -O2 -p -mprofile-kernel - -o - \
+    $* -m64 -mabi=elfv2 -S -x c -O2 -p -mprofile-kernel - -o - \
     2> /dev/null | grep -q "_mcount" && \
     exit 1