From: Randy Dunlap <rdunlap@infradead.org> stable inclusion from stable-v5.10.105 commit f2c52a4baf5637f6bf5dd952b047dedc619efd56 category: bugfix bugzilla: 186460 https://gitee.com/src-openeuler/kernel/issues/I53MHA CVE: CVE-2022-23960 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- commit 68453767131a5deec1e8f9ac92a9042f929e585d upstream. When CONFIG_GENERIC_CPU_VULNERABILITIES is not set, references to spectre_v2_update_state() cause a build error, so provide an empty stub for that function when the Kconfig option is not set. Fixes this build error: arm-linux-gnueabi-ld: arch/arm/mm/proc-v7-bugs.o: in function `cpu_v7_bugs_init': proc-v7-bugs.c:(.text+0x52): undefined reference to `spectre_v2_update_state' arm-linux-gnueabi-ld: proc-v7-bugs.c:(.text+0x82): undefined reference to `spectre_v2_update_state' Fixes: b9baf5c8c5c3 ("ARM: Spectre-BHB workaround") Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Reported-by: kernel test robot <lkp@intel.com> Cc: Russell King <rmk+kernel@armlinux.org.uk> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: linux-arm-kernel@lists.infradead.org Cc: patches@armlinux.org.uk Acked-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Chen Jiahao <chenjiahao16@huawei.com> Reviewed-by: Liao Chang <liaochang1@huawei.com> Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com> --- arch/arm/include/asm/spectre.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/arm/include/asm/spectre.h b/arch/arm/include/asm/spectre.h index d1fa5607d3aa..85f9e538fb32 100644 --- a/arch/arm/include/asm/spectre.h +++ b/arch/arm/include/asm/spectre.h @@ -25,7 +25,13 @@ enum { SPECTRE_V2_METHOD_LOOP8 = BIT(__SPECTRE_V2_METHOD_LOOP8), }; +#ifdef CONFIG_GENERIC_CPU_VULNERABILITIES void spectre_v2_update_state(unsigned int state, unsigned int methods); +#else +static inline void spectre_v2_update_state(unsigned int state, + unsigned int methods) +{} +#endif int spectre_bhb_update_vectors(unsigned int method); -- 2.20.1