linux-kernel - [PATCH] kbuild: dummy-tools, support MPROFILE

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Date:   Mon,  8 Mar 2021 07:28:20 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     masahiroy@...nel.org
Cc:     linux-kernel@...r.kernel.org, Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH] kbuild: dummy-tools, support MPROFILE_KERNEL checks for ppc

ppc64le checks for -mprofile-kernel to define MPROFILE_KERNEL Kconfig.
Kconfig calls arch/powerpc/tools/gcc-check-mprofile-kernel.sh for that
purpose. This script performs two checks:
1) build with -mprofile-kernel should contain "_mcount"
2) build with -mprofile-kernel with a function marked as "notrace"
   should not produce "_mcount"

So support this in dummy-tools' gcc, so that we have MPROFILE_KERNEL
always true.

Signed-off-by: Jiri Slaby <jslaby@...e.cz>
Cc: Masahiro Yamada <masahiroy@...nel.org>
---
 scripts/dummy-tools/gcc | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/scripts/dummy-tools/gcc b/scripts/dummy-tools/gcc
index 0d0589cf8184..7b10332b23ba 100755
--- a/scripts/dummy-tools/gcc
+++ b/scripts/dummy-tools/gcc
@@ -73,6 +73,15 @@ if arg_contain -S "$@"; then
 		echo "%gs"
 		exit 0
 	fi
+
+	# For arch/powerpc/tools/gcc-check-mprofile-kernel.sh
+	if arg_contain -m64 "$@" && arg_contain -mlittle-endian "$@" &&
+		arg_contain -mprofile-kernel "$@"; then
+		if ! test -t 0 && ! grep -q notrace; then
+			echo "_mcount"
+		fi
+		exit 0
+	fi
 fi

 # To set GCC_PLUGINS
-- 
2.30.1