linux-kernel - [PATCH 35/46] Kbuild, lto: disable gcc LTO for bounds+asm-offsets

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Date:   Mon, 14 Nov 2022 12:43:33 +0100
From:   "Jiri Slaby (SUSE)" <jirislaby@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Andi Kleen <andi@...stfloor.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-kbuild@...r.kernel.org, Martin Liska <mliska@...e.cz>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 35/46] Kbuild, lto: disable gcc LTO for bounds+asm-offsets

From: Andi Kleen <andi@...stfloor.org>

Disable LTO when generating the bounds+asm-offsets.s files which are
scanned for C constants. With a LTO build, the file would contain the
gcc IR in assembler form, which breaks the scanning scripts.

Cc: Masahiro Yamada <masahiroy@...nel.org>
Cc: Michal Marek <michal.lkml@...kovi.net>
Cc: Nick Desaulniers <ndesaulniers@...gle.com>
Cc: linux-kbuild@...r.kernel.org
Signed-off-by: Andi Kleen <andi@...stfloor.org>
Signed-off-by: Martin Liska <mliska@...e.cz>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 Kbuild | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Kbuild b/Kbuild
index 464b34a08f51..40744d76d416 100644
--- a/Kbuild
+++ b/Kbuild
@@ -11,6 +11,8 @@ bounds-file := include/generated/bounds.h
 
 targets := kernel/bounds.s
 
+kernel/bounds.s: KBUILD_CFLAGS += $(DISABLE_LTO_GCC)
+
 $(bounds-file): kernel/bounds.s FORCE
 	$(call filechk,offsets,__LINUX_BOUNDS_H__)
 
@@ -30,6 +32,7 @@ offsets-file := include/generated/asm-offsets.h
 targets += arch/$(SRCARCH)/kernel/asm-offsets.s
 
 arch/$(SRCARCH)/kernel/asm-offsets.s: $(timeconst-file) $(bounds-file)
+arch/$(SRCARCH)/kernel/asm-offsets.s: KBUILD_CFLAGS += $(DISABLE_LTO_GCC)
 
 $(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE
 	$(call filechk,offsets,__ASM_OFFSETS_H__)
-- 
2.38.1