From: Arnd Bergmann arnd@arndb.de
stable inclusion from stable-5.10.80 commit b3ae170b8e3fb0b8a49f44911f4d700bb5a9d997 bugzilla: 185821 https://gitee.com/openeuler/kernel/issues/I4L7CG
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ 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.d...
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 Signed-off-by: Chen Jun chenjun102@huawei.com Reviewed-by: Weilong Chen chenweilong@huawei.com Acked-by: Weilong Chen chenweilong@huawei.com
Signed-off-by: Chen Jun chenjun102@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- 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 02692fbe2db5..423a97dd2f57 100644 --- a/arch/arm/mm/Kconfig +++ b/arch/arm/mm/Kconfig @@ -753,7 +753,7 @@ 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.