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compat: provide compat_ptr() on all architectures

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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 <ben.hutchings@codethink.co.uk>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann 2019-12-12 18:15:25 +01:00
parent 556d687a4c
commit 202bf8d758
9 changed files with 20 additions and 109 deletions
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18
include/linux/compat.h
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@ -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 */