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authorVineet Gupta <vgupta@synopsys.com>2013-01-18 13:42:16 +0400
committerVineet Gupta <vgupta@synopsys.com>2013-02-11 18:30:32 +0400
commit05d88a493746819821733e07bed918a6e09f735b (patch)
tree59f1a8d8e291e62507b3b221240ee9b926e14ce7 /include/asm-generic/uaccess.h
parent43697cb0973da144156e7d11ddd035aee226ee30 (diff)
downloadlinux-05d88a493746819821733e07bed918a6e09f735b.tar.xz
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/uaccess.h')
-rw-r--r--include/asm-generic/uaccess.h11
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