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>
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@ -169,12 +169,18 @@ static inline __must_check long __copy_to_user(void __user *to,
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-EFAULT; \
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})
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#ifndef __put_user_fn
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static inline int __put_user_fn(size_t size, void __user *ptr, void *x)
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{
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size = __copy_to_user(ptr, x, size);
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return size ? -EFAULT : size;
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}
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#define __put_user_fn(sz, u, k) __put_user_fn(sz, u, k)
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#endif
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extern int __put_user_bad(void) __attribute__((noreturn));
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#define __get_user(x, ptr) \
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@ -225,12 +231,17 @@ extern int __put_user_bad(void) __attribute__((noreturn));
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-EFAULT; \
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})
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#ifndef __get_user_fn
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static inline int __get_user_fn(size_t size, const void __user *ptr, void *x)
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{
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size = __copy_from_user(x, ptr, size);
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return size ? -EFAULT : size;
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}
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#define __get_user_fn(sz, u, k) __get_user_fn(sz, u, k)
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#endif
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extern int __get_user_bad(void) __attribute__((noreturn));
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#ifndef __copy_from_user_inatomic
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