From 1c1a18b00d7e25d1bed3507880de2da07be704a2 Mon Sep 17 00:00:00 2001 From: Vincenzo Frascino Date: Mon, 23 Mar 2020 12:41:09 +0000 Subject: [PATCH] um: Fix header inclusion User Mode Linux is a flavor of x86 that from the vDSO prospective always falls back on system calls. This implies that it does not require any of the unified vDSO definitions and their inclusion causes side effects like this: In file included from include/vdso/processor.h:10:0, from include/vdso/datapage.h:17, from arch/x86/include/asm/vgtod.h:7, from arch/x86/um/../kernel/sys_ia32.c:49: >> arch/x86/include/asm/vdso/processor.h:11:29: error: redefinition of 'rep_nop' static __always_inline void rep_nop(void) ^~~~~~~ In file included from include/linux/rcupdate.h:30:0, from include/linux/rculist.h:11, from include/linux/pid.h:5, from include/linux/sched.h:14, from arch/x86/um/../kernel/sys_ia32.c:25: arch/x86/um/asm/processor.h:24:20: note: previous definition of 'rep_nop' was here static inline void rep_nop(void) Make sure that the unnecessary headers are not included when um is built to address the problem. Fixes: abc22418db02 ("x86/vdso: Enable x86 to use common headers") Reported-by: kbuild test robot Signed-off-by: Vincenzo Frascino Signed-off-by: Borislav Petkov Link: https://lkml.kernel.org/r/20200323124109.7104-1-vincenzo.frascino@arm.com --- arch/x86/include/asm/vgtod.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/x86/include/asm/vgtod.h b/arch/x86/include/asm/vgtod.h index fc8e4cd342cc..7aa38b2ad8a9 100644 --- a/arch/x86/include/asm/vgtod.h +++ b/arch/x86/include/asm/vgtod.h @@ -2,6 +2,11 @@ #ifndef _ASM_X86_VGTOD_H #define _ASM_X86_VGTOD_H +/* + * This check is required to prevent ARCH=um to include + * unwanted headers. + */ +#ifdef CONFIG_GENERIC_GETTIMEOFDAY #include #include #include @@ -14,5 +19,6 @@ typedef u64 gtod_long_t; #else typedef unsigned long gtod_long_t; #endif +#endif /* CONFIG_GENERIC_GETTIMEOFDAY */ #endif /* _ASM_X86_VGTOD_H */