diff mbox series

[32/46] x86/realmode, lto: Disable gcc LTO for real mode code

Message ID 20221114114344.18650-33-jirislaby@kernel.org
State New
Headers
Series gcc-LTO support for the kernel |

Commit Message

Jiri Slaby Nov. 14, 2022, 11:43 a.m. UTC 
  From: Andi Kleen <ak@linux.intel.com>

The early real mode bootup code makes various assumptions that break
with LTO. For example it assumes that top level assembler statements
don't get reordered. Disable LTO for the real mode code.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: x86@kernel.org
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Martin Liska <mliska@suse.cz>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 arch/x86/realmode/Makefile | 1 +
 1 file changed, 1 insertion(+)
diff mbox series

Patch

diff --git a/arch/x86/realmode/Makefile b/arch/x86/realmode/Makefile
index a0b491ae2de8..47b8b500cf15 100644
--- a/arch/x86/realmode/Makefile
+++ b/arch/x86/realmode/Makefile
@@ -10,6 +10,7 @@ 
 # Sanitizer runtimes are unavailable and cannot be linked here.
 KASAN_SANITIZE			:= n
 KCSAN_SANITIZE			:= n
+KBUILD_CFLAGS			+= $(DISABLE_LTO_GCC)
 
 subdir- := rm