linux-kernel - [PATCH 1/7] ARM: disallow combining XIP and LTO

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Date:   Tue, 20 Feb 2018 22:59:48 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Nicolas Pitre <nico@...aro.org>
Cc:     Andi Kleen <ak@...ux.intel.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>
Subject: [PATCH 1/7] ARM: disallow combining XIP and LTO

This fails during deflate_xip_data.sh

  /home/arnd/cross-gcc/bin/arm-linux-gnueabi-objcopy -O binary -R .comment -S  vmlinux arch/arm/boot/xipImage && /bin/bash -c '/git/arm-soc/arch/arm/boot/deflate_xip_data.sh vmlinux arch/arm/boot/xipImage || { rm -f arch/arm/boot/xipImage; false; }'
make -f /git/arm-soc/scripts/Makefile.modpost
+ sym_val __data_loc
+ sed -n / __data_loc$/{s/ .*$//p;q}
+ /home/arnd/cross-gcc/bin/arm-linux-gnueabi-gcc-nm vmlinux
/home/arnd/cross-gcc/lib/gcc/arm-linux-gnueabi/8.0.1/../../../../arm-linux-gnueabi/bin/nm terminated with signal 13 [Broken pipe]
+ local val=ac74c0f4
+ [ ac74c0f4 ]
+ echo 2893332724
+ __data_loc=2893332724
+ sym_val _edata_loc
+ /home/arnd/cross-gcc/bin/arm-linux-gnueabi-gcc-nm vmlinux
+ sed -n / _edata_loc$/{s/ .*$//p;q}
/home/arnd/cross-gcc/lib/gcc/arm-linux-gnueabi/8.0.1/../../../../arm-linux-gnueabi/bin/nm terminated with signal 13 [Broken pipe]
+ local val=ac7b8744
+ [ ac7b8744 ]
+ echo 2893776708
+ _edata_loc=2893776708
+ sym_val _xiprom
+ sed -n / _xiprom$/{s/ .*$//p;q}
+ /home/arnd/cross-gcc/bin/arm-linux-gnueabi-gcc-nm vmlinux
/home/arnd/cross-gcc/lib/gcc/arm-linux-gnueabi/8.0.1/../../../../arm-linux-gnueabi/bin/nm terminated with signal 13 [Broken pipe]

Obviously we want to make the combination work, no idea why it doesn't.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 arch/arm/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 823e397ee0f3..8ed0f664f86f 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1976,6 +1976,7 @@ endchoice
 config XIP_KERNEL
 	bool "Kernel Execute-In-Place from ROM"
 	depends on !ARM_LPAE && !ARCH_MULTIPLATFORM
+	depends on !LTO
 	help
 	  Execute-In-Place allows the kernel to run from non-volatile storage
 	  directly addressable by the CPU, such as NOR flash. This saves RAM
-- 
2.9.0