From 202bf8d7583f2b6e28de2e9edf6fcd7e3667a173 Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Thu, 12 Dec 2019 18:15:25 +0100 Subject: compat: provide compat_ptr() on all architectures In order to avoid needless #ifdef CONFIG_COMPAT checks, move the compat_ptr() definition to linux/compat.h where it can be seen by any file regardless of the architecture. Only s390 needs a special definition, this can use the self-#define trick we have elsewhere. Reviewed-by: Ben Hutchings Signed-off-by: Arnd Bergmann --- include/linux/compat.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'include/linux/compat.h') diff --git a/include/linux/compat.h b/include/linux/compat.h index 68f79d855c3d..11083d84eb23 100644 --- a/include/linux/compat.h +++ b/include/linux/compat.h @@ -958,4 +958,22 @@ static inline bool in_compat_syscall(void) { return false; } #endif /* CONFIG_COMPAT */ +/* + * A pointer passed in from user mode. This should not + * be used for syscall parameters, just declare them + * as pointers because the syscall entry code will have + * appropriately converted them already. + */ +#ifndef compat_ptr +static inline void __user *compat_ptr(compat_uptr_t uptr) +{ + return (void __user *)(unsigned long)uptr; +} +#endif + +static inline compat_uptr_t ptr_to_compat(void __user *uptr) +{ + return (u32)(unsigned long)uptr; +} + #endif /* _LINUX_COMPAT_H */ -- cgit v1.2.3-58-ga151