From: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Date: Mon, 30 Oct 2023 11:34:16 +0000 (+0100)
Subject: kbuild: dummy-tools: pretend we understand -fpatchable-function-entry
X-Git-Tag: v6.7-rc1~68^2~1
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=1bfaa37fd3486e66131de9cb87747c84b4c89a05;p=thirdparty%2Fkernel%2Flinux.git

kbuild: dummy-tools: pretend we understand -fpatchable-function-entry

Commit 0f71dcfb4aef ("powerpc/ftrace: Add support for
-fpatchable-function-entry") added a script to check for
-fpatchable-function-entry compiler support. The script expects compiler
to emit the section __patchable_function_entries and few nops after a
function entry.

If the compiler understands and emits the above,
CONFIG_ARCH_USING_PATCHABLE_FUNCTION_ENTRY is set.

So teach dummy-tools' gcc about this.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
---

diff --git a/scripts/dummy-tools/gcc b/scripts/dummy-tools/gcc
index 07f6dc4c5cf69..e6c41427c02f3 100755
--- a/scripts/dummy-tools/gcc
+++ b/scripts/dummy-tools/gcc
@@ -91,6 +91,16 @@ if arg_contain -S "$@"; then
 		fi
 		exit 0
 	fi
+
+	# For arch/powerpc/tools/gcc-check-fpatchable-function-entry.sh
+	if arg_contain -m64 "$@" && arg_contain -fpatchable-function-entry=2 "$@"; then
+		echo "func:"
+		echo ".section __patchable_function_entries"
+		echo ".localentry"
+		echo "  nop"
+		echo "  nop"
+		exit 0
+	fi
 fi
 
 # To set GCC_PLUGINS