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| author | Vineet Gupta <vgupta@synopsys.com> | 2013-01-18 15:12:16 +0530 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2013-02-11 20:00:32 +0530 |
| commit | 05d88a493746819821733e07bed918a6e09f735b (patch) | |
| tree | 59f1a8d8e291e62507b3b221240ee9b926e14ce7 /include/asm-generic | |
| parent | 43697cb0973da144156e7d11ddd035aee226ee30 (diff) | |
| download | lwn-05d88a493746819821733e07bed918a6e09f735b.tar.gz lwn-05d88a493746819821733e07bed918a6e09f735b.zip | |
asm-generic: uaccess: Allow arches to over-ride __{get,put}_user_fn()
As of now these default to calling the arch provided __copy_{to,from}_user()
routines which being general purpose (w.r.t buffer alignment and lengths)
would lead to alignment checks in generated code (for arches which don't
support unaligned load/stores).
Given that in this case we already know that data involved is "unit"
sized and aligned, using the vanilla copy backend is a bit wasteful.
This change thus allows arches to over-ride the aforementioned routines.
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'include/asm-generic')
| -rw-r--r-- | include/asm-generic/uaccess.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/include/asm-generic/uaccess.h b/include/asm-generic/uaccess.h index 5f6ee6138f9a..c184aa8ec8cd 100644 --- a/include/asm-generic/uaccess.h +++ b/include/asm-generic/uaccess.h @@ -169,12 +169,18 @@ static inline __must_check long __copy_to_user(void __user *to, -EFAULT; \ }) +#ifndef __put_user_fn + static inline int __put_user_fn(size_t size, void __user *ptr, void *x) { size = __copy_to_user(ptr, x, size); return size ? -EFAULT : size; } +#define __put_user_fn(sz, u, k) __put_user_fn(sz, u, k) + +#endif + extern int __put_user_bad(void) __attribute__((noreturn)); #define __get_user(x, ptr) \ @@ -225,12 +231,17 @@ extern int __put_user_bad(void) __attribute__((noreturn)); -EFAULT; \ }) +#ifndef __get_user_fn static inline int __get_user_fn(size_t size, const void __user *ptr, void *x) { size = __copy_from_user(x, ptr, size); return size ? -EFAULT : size; } +#define __get_user_fn(sz, u, k) __get_user_fn(sz, u, k) + +#endif + extern int __get_user_bad(void) __attribute__((noreturn)); #ifndef __copy_from_user_inatomic |