| From 3f32bb9fc11794eb8c3b0d83bfbb91862d4b1e03 Mon Sep 17 00:00:00 2001 |
| From: Sasha Levin <sashal@kernel.org> |
| Date: Mon, 18 Oct 2021 15:30:06 +0100 |
| Subject: ARM: 9136/1: ARMv7-M uses BE-8, not BE-32 |
| |
| From: Arnd Bergmann <arnd@arndb.de> |
| |
| [ Upstream commit 345dac33f58894a56d17b92a41be10e16585ceff ] |
| |
| When configuring the kernel for big-endian, we set either BE-8 or BE-32 |
| based on the CPU architecture level. Until linux-4.4, we did not have |
| any ARMv7-M platform allowing big-endian builds, but now i.MX/Vybrid |
| is in that category, adn we get a build error because of this: |
| |
| arch/arm/kernel/module-plts.c: In function 'get_module_plt': |
| arch/arm/kernel/module-plts.c:60:46: error: implicit declaration of function '__opcode_to_mem_thumb32' [-Werror=implicit-function-declaration] |
| |
| This comes down to picking the wrong default, ARMv7-M uses BE8 |
| like ARMv7-A does. Changing the default gets the kernel to compile |
| and presumably works. |
| |
| https://lore.kernel.org/all/1455804123-2526139-2-git-send-email-arnd@arndb.de/ |
| |
| Tested-by: Vladimir Murzin <vladimir.murzin@arm.com> |
| Signed-off-by: Arnd Bergmann <arnd@arndb.de> |
| Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> |
| Signed-off-by: Sasha Levin <sashal@kernel.org> |
| --- |
| arch/arm/mm/Kconfig | 2 +- |
| 1 file changed, 1 insertion(+), 1 deletion(-) |
| |
| diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig |
| index 0ab3a86b1f523..fc388eb60e0b7 100644 |
| --- a/arch/arm/mm/Kconfig |
| +++ b/arch/arm/mm/Kconfig |
| @@ -752,7 +752,7 @@ config CPU_BIG_ENDIAN |
| config CPU_ENDIAN_BE8 |
| bool |
| depends on CPU_BIG_ENDIAN |
| - default CPU_V6 || CPU_V6K || CPU_V7 |
| + default CPU_V6 || CPU_V6K || CPU_V7 || CPU_V7M |
| help |
| Support for the BE-8 (big-endian) mode on ARMv6 and ARMv7 processors. |
| |
| -- |
| 2.33.0 |
| |