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From: Paul Cercueil <paul@crapouillou.net>
To: Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	Nathan Chancellor <nathan@kernel.org>,
	Nick Desaulniers <ndesaulniers@google.com>
Cc: list@opendingux.net, linux-mips@vger.kernel.org,
	linux-kernel@vger.kernel.org, llvm@lists.linux.dev,
	Paul Cercueil <paul@crapouillou.net>
Subject: [PATCH 2/3] MIPS: boot/compressed: Build without LTO
Date: Mon, 13 Dec 2021 22:49:13 +0000	[thread overview]
Message-ID: <20211213224914.1501303-3-paul@crapouillou.net> (raw)
In-Reply-To: <20211213224914.1501303-1-paul@crapouillou.net>

We need a valid ELF object for dummy.o, so that objcopy can insert the
vmlinuz payload.

Therefore, we must build the decompresser program without LTO, otherwise
dummy.o will be LLVM bytecode instead of a ELF object file.

Building the decompresser with LTO wouldn't make much sense anyway,
unlike building the vmlinuz itself with LTO.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---
 arch/mips/boot/compressed/Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/mips/boot/compressed/Makefile b/arch/mips/boot/compressed/Makefile
index 4c9ecfbb0ef4..2d01c50fb0b1 100644
--- a/arch/mips/boot/compressed/Makefile
+++ b/arch/mips/boot/compressed/Makefile
@@ -27,6 +27,9 @@ ifdef CONFIG_CPU_LOONGSON64
 KBUILD_CFLAGS := $(filter-out -march=loongson3a, $(KBUILD_CFLAGS)) -march=mips64r2
 endif
 
+# Disable LTO
+KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_LTO), $(KBUILD_CFLAGS))
+
 KBUILD_CFLAGS := $(KBUILD_CFLAGS) -mno-abicalls -D__KERNEL__ -D__DISABLE_EXPORTS \
 	-DBOOT_HEAP_SIZE=$(BOOT_HEAP_SIZE) -D"VMLINUX_LOAD_ADDRESS_ULL=$(VMLINUX_LOAD_ADDRESS)ull"
 
-- 
2.33.0


  parent reply	other threads:[~2021-12-13 22:49 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-13 22:49 [PATCH 0/3] MIPS: Add support for LTO Paul Cercueil
2021-12-13 22:49 ` [PATCH 1/3] MIPS: boot/compressed: Disable abicalls Paul Cercueil
2021-12-14 18:06   ` Nathan Chancellor
2021-12-14 19:09     ` Paul Cercueil
2021-12-14 19:38       ` Nick Desaulniers
2021-12-13 22:49 ` Paul Cercueil [this message]
2021-12-14 18:07   ` [PATCH 2/3] MIPS: boot/compressed: Build without LTO Nathan Chancellor
2021-12-14 19:43   ` Nick Desaulniers
2021-12-13 22:49 ` [PATCH 3/3] MIPS: Add support for LTO Paul Cercueil
2021-12-14 18:09   ` Nathan Chancellor
2021-12-14 19:45   ` Nick Desaulniers
2021-12-14 18:11 ` [PATCH 0/3] " Nathan Chancellor
2021-12-14 19:34 ` Nick Desaulniers

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